[IGSREPORT-25893] Wk 1997 IGS Final Orbits

acc acc at igs.org
Sun May 6 04:51:47 PDT 2018


Author:  AC Coordinator / GA MIT 

sum-file Version 2.0
Final IGS Orbit Combination - Week 1997   (Apr 15, 2018 - Apr 21, 2018)

Contacts: acc at igs.org


COMBINATION STRATEGY:
---------------------

Starting with GPS week 860, the IGS Final orbit combination is done directly
in the ITRF without any alignment to the Bulletin B EOP series.

Each centre satellite clock corrections are first transformed to a common 
reference. One of the following two methods can be used (the REMARKS section of
this report gives which method is used):
[1] For each centre, a clock offset and a drift are estimated with respect to
    the broadcast clock corrections using only non-SA satellites;
[2] A chosen reference centre is aligned to the broadcast clock corrections
    using all satellites. All other centres are then aligned to that reference
    centre. 
The offsets and drifts are used to align each centre satellite clock
corrections to GPS time. Ephemerides and clock corrections are then combined
as weighted averages computed over all centres. Each centre is given a
position weight and a clock weight. The position weights are computed from
each centre's absolute deviation to the unweighted average orbit after the
estimation of a 7-parameter Helmert transformation. The clock weights are
either computed from [1] the absolute deviation of the initial alignment to
broadcast clock for the non-SA satellites, or [2] from the absolute deviation
of centre's aligned clock corrections with respect to the unweighted mean.
Finally, a 7-parameter Helmert transformation and clock offset and drift are
estimated for each centre with respect to the combined solutions and parameters
and RMS of fit reported. All the above estimations are performed using the
L1-norm robust scheme.

  Each centre ephemerides are also evaluated individually and independently from
the orbit combination by using week long arcs. The Earth Orientation Parameters
(EOP) used in this evaluation are those submitted by the respective centres.
The IGS combined orbits/clocks and all centres providing both orbit and clock 
solutions are further evaluated by an independent point positioning (navigation)
program that uses both phase and pseudorange data at each SP3 epoch. This is
primarily intended for testing clock solution precision as well as the
orbit/clock consistency.

 Like the clock solutions broadcast in the navigation message, the combined
satellite clocks are corrected for the periodical relativistic correction (see
e.g. GPS interface Control document ICD-GPS-200, p.73):

                              -2*(X.V)/c  [distance unit],

where X and V are the inertial sv state and velocity vectors and c is the speed
of light. Also for compatibility with broadcast GPS time, the IGS clocks use
the linear combination of phase-smoothed P1 and P2 pseudorange data to remove
the 1st order ionospheric delay, with no other delay calibrations applied.


SOFTWARE:
---------

The weighted average software used was originally developed by T. Springer
and G. Beutler in 1993. The GPS long arc orbit analysis software used here for
individual centre ephemeris evaluation was developed by Beutler et al. at the
Astronomical Institute of the University of Bern (AIUB). For more details on
the orbit combination and complete references for both software see:

  Beutler G., Kouba J. and T. Springer, 1995, Combining the orbits of the IGS 
  Analysis Centers, Bulletin Geodesique, 69, pp 200-222.

  Kouba J., Mireault Y. and F. Lahaye, 1995, 1994 IGS Orbit/Clock Combination
  and Evaluation, Appendix I of the Analysis Coordinator Report, International
  GPS Service for Geodynamics (IGS) 1994 Annual Report, pp. 70-94.

  Kouba J. and Y. Mireault, 1996, IGS Analysis Coordinator Report, 
  International GPS Service for Geodynamics (IGS) 1995 Annual Report, 
  pp. 45-76.

  Kouba J. and Y. Mireault, 1997, Analysis Coordinator Report, 
  International GPS Service for Geodynamics (IGS) 1996 Annual Report, 
  pp. 55-100.


PRODUCTS GENERATED:
-------------------

The resulting average ephemeris and clocks are output to daily files in SP3
format. The satellite accuracy codes displayed in the header are based on the
weighted RMS for each satellite over each daily arc. Note that each file
contains all the satellites that appear in any of the centre ephemeris files.
If a satellite or centre was excluded from combination, a note in the REMARKS
section of this report will identify the exclusion and the reason.

The resulting x and y earth rotation parameters (ERP) associated with the IGS
ephemeris files and their rates (xrt, yrt) are computed using a weighted average
of all available centres (as part of the separate SINEX combination since GPS
week 1051; weighted according to the orbit combination before that time). 

Starting with GPS wk 0894, IGS LOD combinations were implemented in the 
Final IGS solutions. AC LOD biases with respect to Bulletin A are estimated
using Bulletin A most recent 10 days, i.e. up to 5 days prior to the last
non-predicted day of Bulletin A. AC LOD biases are removed and the new AC
bias-free LODs are used to compute a weighted IGS LOD which in turn is
integrated into IGS UT1-UTC. The starting UT1-UTC value is chosen as Bulletin
A fifth day prior to its last non-predicted day. Both IGS LOD and UT1-UTC
values are printed in the IGS Final erp file.



The Final Orbit files generated and uploaded into CDDIS @ NASA/GSFC are:

igs1997[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1997[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1997[0-6].cls  IGS GPS clock combination summary report.
igs19977.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs19977.sum      Complete report.

    
REMARKS concerning the IGS Orbit Combination:                                  
---------------------------------------------

 1. The centres used in the clock combination are COD, EMR, ESA, GFZ, GRG, MIT, and
    JPL. The other centres are excluded because of poorer consistency, they provide
    broadcast clocks, or clock corrections are not provided (SIO). The clock
    information not used is still compared to the combination for completeness. The
    value of 999999.999999 microseconds, according to the SP3 format convention,
    signifies that no clock solution is available and therefore must not be used.
    
    In general, if an AC does not contribute to the terrestrial reference frame
    (i.e. the SINEX combination), then any corresponding orbits & clocks
    contributed from that AC should not be included with weight in this
    combination. This is done to ensure a high level of consistency between the TRF
    and the orbital frame. However, there is an exception for the clocks if the AC
    is the reference center. In that case, only the clocks from that AC are
    included with weight.
    
    Starting week 1707:
      cod = cof${wwww}[0-6].[clk,snx,sp3] & cod = cof${wwww}7.[erp,sum]

 2. Rapid (IGR) orbits/clocks are included in the combination for statistics only.
    Starting week 1582, a new orbit solution from CNES/GRGS (GRG) is included with
    weight. GRG clocks are included with weight starting 12-Aug-2012 (GPS Week
    1701, day 0, MJD 56151), after a procedural change to generate estimates in
    the center-of-figure frame instead of the center-of-mass frame. GRG LOD
    estimates are included for comparison only.

 3. The following centre clock solutions, which provide broadcast clock
    corrections, were excluded from the combination but kept in the combination
    statistics:
             -> Centre: NGS 

 4. The following clock solutions were excluded from the combination because they
    were biasing the combined clock solutions (clock shifts/outliers) but were
    kept for the RMS computation. Duplicate entries can arise due to separate
    combination runs for the 30-s clocks ACs (listed first) and the 5-min clock
    ACs (listed second).
    
               Day | Centre | PRN/STA list
               ----+--------+---------------
                0  |  COD   | SUTH TIXI ARTU SFER SUTH TIXI TLSE WIND
                0  |  EMR   | 10 10 24
                0  |  ESA   | FAA1 MAL2 TLSE FAA1 MAL2 TLSE
                0  |  GFZ   | 18 18 DARW FAA1 MAL2 REUN YELL DARW FAA1 MAL2 REUN
                0  |  GFZ   | YELL
                0  |  GRG   | GLSV JFNG KIT3 SEYG GLSV JFNG KIT3 SEYG
                0  |  MIT   | DARW DARW
                1  |  COD   | SUTH TIXI SUTH TIXI
                1  |  EMR   | 10 VILL
                1  |  ESA   | FAA1 MAL2 SCUB FAA1 MAL2 SCUB
                1  |  GFZ   | 18 18 BJNM DARW FAA1 MAL2 BJNM BOGT DARW FAA1 GODE
                1  |  GFZ   | MAL2
                1  |  GRG   | GLSV JFNG KIT3 SEYG COCO GLSV JFNG KIT3 SEYG
                2  |  COD   | 14 14 SUTH TIXI BRAZ SCUB SUTH TIXI
                2  |  EMR   | CHUR
                2  |  ESA   | MAL2 MAL2
                2  |  GFZ   | 18 18 MAL2 BJNM MAL2
                2  |  GRG   | ARTU GLSV JFNG KIT3 ARTU DARW GLSV JFNG KIT3 LPGS
                3  |  COD   | TIXI KERG TIXI ZAMB
                3  |  EMR   | MCM4 MCM4
                3  |  ESA   | FAA1 JFNG WIND
                3  |  GFZ   | 18 25 13 18 25 BJNM GODE KERG POHN SUTH BJNM GODE
                3  |  GFZ   | KERG POHN SUTH
                3  |  GRG   | KIT3 KIT3 SCUB
                4  |  COD   | 13 TIXI DAEJ FAA1 SCUB TIXI
                4  |  EMR   | 1
                4  |  ESA   | JFNG JFNG
                4  |  GFZ   | 18 24 18 24 BJNM GODE REUN SUTH ZAMB BJNM GODE REUN
                4  |  GFZ   | SUTH ZAMB
                4  |  GRG   | DAEJ GLSV IRKJ KIT3 DAEJ DARW FAA1 GLSV IRKJ KIT3
                4  |  GRG   | MCIL POHN TLSE
                5  |  COD   | KOUR MATE TIXI KOUR MATE TIXI WHIT
                5  |  EMR   | CHUR FAIR CHUR FAIR KIRU PTBB SCH2 YELL
                5  |  ESA   | KOUR MAL2 KOUR MAL2
                5  |  GFZ   | 18 18 CEDU FAA1 GODE KELY MAL2 POHN PTBB CEDU FAA1
                5  |  GFZ   | GODE KELY MAL2 POHN PTBB SUTH
                5  |  GRG   | GLSV KIT3 TEHN WIND FAA1 GLSV KELY KIT3 TEHN
                5  |  JPL   | KELY
                5  |  MIT   | KELY KELY
                6  |  COD   | KOUR TIXI BAKE BRMU KOUR TIXI
                6  |  EMR   | 14 TLSE TLSE
                6  |  ESA   | ADIS
                6  |  GFZ   | 8 18 8 18 BJNM FAA1 GODE KOUR POHN SUTH BJNM FAA1
                6  |  GFZ   | GODE KOUR POHN SUTH
                6  |  GRG   | FAA1 GLSV KIT3 FAA1 GLSV KIT3
                6  |  MIT   | HRAO MAR6 HRAO MAR6

 5. Starting on 22-Oct-2000 (GPS Week 1085-0; MJD=51839) all IGS clock products
    are based on the new clock combination scheme which uses the clock RINEX
    files as input if available, otherwise SP3 clocks are used. The AC clocks are
    corrected for the radial offsets of their satellite orbits compared to the
    combination.

 6. Velocity changes were estimated to alleviate the effects of modeling problems,
    experienced by all centres,in the Long Arc (LA) process.
    
             Velocity changes per day and affected satellites:
    
               Day |  0 |  1 |  2 |  3 |  4 |  5 |  6 |
           --------+----+----+----+----+----+----+----+
           PRN G17 |    |    |  4 |  4 |    |    |    |

 7. Starting 5-Nov-2006 (GPS Week 1400, day 0, MJD 54044) until 16-Apr-2011 (GPS
    Week 1631, day 6, MJD 55667) all IGS products, including the IGS combined
    orbits, are based on the IGS realization of the ITRF2005 reference frame
    (IGS05). For more information see IGSMAIL #5447. The IGS05 frame is also the
    basis for the homogeneously reprocessed IGS products from GPS Weeks 730 to 1459
    (1994-2007); see IGSMAIL #6136.
    
    Starting 17-Apr-2011 (GPS Week 1632, day 0, MJD 55668) all IGS products, are
    based on the IGS realization of the ITRF2008 reference frame (IGS08). For more
    information see IGSMAIL #6354.
    
    Starting 07-Oct-2012 (GPS Week 1709, day 0, MJD 56207) all IGS products, are
    based on the updated IGS08 frame (IGb08). For more information see IGSMAIL
    #6663.
    
    Starting 29-Jan-2017 (GPS Week 1934, day 0, MJD 57782) all IGS products,
    are based on the IGS realization of the ITRF2014 reference frame (IGS14).
    For more information see IGSMAIL #7399.

 8. Small rotations were applied to all the AC orbit and ERP values in order to
    align them to the current IGS reference frame. These RX, RY and RZ rotations
    were estimated in the IGS SINEX combination process, performed by the IGS
    Reference Frame Coordinator at the Institut Geographique National (IGN).
    Starting on 19-Aug-2012 (GPS Week 1702; MJD=56158), ACs began contributing
    products based on 1d SINEX integrations. As a result, the SINEX combinations
    are now done daily instead of weekly, and the associated daily rotations are
    applied here to the orbits and ERPs. The estimated 7 transformations, from
    which only the 3 rotations are applied to the orbit and ERP values, are:
    
            |     |    DX     DY     DZ      RX     RY     RZ     SCL
     Centre | Day |   [mm]   [mm]   [mm]   [uas]  [uas]  [uas]   [ppb]
     -------+-----+---------------------------------------------------
       COD  |   0 |     .1     .5     .1      14     14    -15     .16
       EMR  |   0 |    6.2   -4.8   10.5      -2     13     11     .19
       ESA  |   0 |     .3    -.8    -.1     -33      9     22    -.05
       GFZ  |   0 |    -.1    -.5    -.6     -12     -8      2     .29
       GRG  |   0 |    4.3   -8.0    9.0      23     -3     31     .02
       JPL  |   0 |    7.5   -5.2    9.8      28     14     66     .49
       MIT  |   0 |    2.8  -14.9   14.8     -55     39    -17     .35
       NGS  |   0 |    3.1   -2.5    4.9     -52    -32      3     .21
       SIO  |   0 |    4.0   -8.7    -.9      -4     15      9     .11

       COD  |   1 |    -.2     .5    -.1      17     17    -14     .15
       EMR  |   1 |    6.7   -7.7    9.3      13     29    -22     .26
       ESA  |   1 |    -.1    -.8    1.0     -33     28     34    -.13
       GFZ  |   1 |     .2    -.1   -1.6      -6    -22     -1     .30
       GRG  |   1 |    9.9   -6.5   -2.8       8     -4     57     .16
       JPL  |   1 |    7.0   -3.5    7.8      12     -4    117     .78
       MIT  |   1 |    2.4  -10.7    6.9     -57     19    -15     .35
       NGS  |   1 |    5.4   -4.1   17.0     -88    -60      2     .09
       SIO  |   1 |    3.9   -6.3    1.9       7     -4    -19     .14

       COD  |   2 |    -.2     .6    -.2      14     17    -15    -.08
       EMR  |   2 |   14.6    -.4    5.6       8     14     -9    -.16
       ESA  |   2 |     .4    -.6     .8     -28     14     18     .0 
       GFZ  |   2 |     .4    -.3   -1.5      -6    -23     -2     .17
       GRG  |   2 |    7.7   -4.6    6.1      13      1     25    -.13
       JPL  |   2 |    4.5   -4.8   10.2     -55    -26     76     .49
       MIT  |   2 |    2.3  -11.0   14.3     -23     38    -11     .24
       NGS  |   2 |    3.1     .7   14.3     -53    -57     19     .19
       SIO  |   2 |    3.7   -9.3    6.9      14     -5    -14     .05

       COD  |   3 |    -.6     .3    -.2       4     18     -1     .13
       EMR  |   3 |   10.1  -12.4   19.2      -7     28    -38     .15
       ESA  |   3 |     .6    -.9     .6     -26     13     29     .10
       GFZ  |   3 |    -.1    -.1   -1.3      -7    -13    -14     .35
       GRG  |   3 |    6.0   -6.5    8.8      38     24     31    -.06
       JPL  |   3 |    7.8   -7.4   16.4      -1    -17    105     .48
       MIT  |   3 |    4.9   -9.7   14.3     -29     33     14     .47
       NGS  |   3 |    8.4  -10.3   19.3     -73    -45     22     .25
       SIO  |   3 |    7.3   -7.9    9.2      21      3     -5     .08

       COD  |   4 |    -.8     .6    -.2      18     32    -17     .11
       EMR  |   4 |    8.6  -11.3    8.1      -1     23     10     .33
       ESA  |   4 |     .1    -.5    1.0      -8     32     26     .19
       GFZ  |   4 |    -.3     .1   -1.2      -4    -10      2     .26
       GRG  |   4 |    5.6   -8.1   -1.4      38     12     20    -.07
       JPL  |   4 |    3.6   -5.3    9.6      36    -15    131     .47
       MIT  |   4 |    1.5  -12.3    6.8     -47     59    -31     .49
       NGS  |   4 |    6.7   -7.2   12.9     -61    -29     11     .26
       SIO  |   4 |    4.3   -7.1    2.7      13     18    -10     .09

       COD  |   5 |    -.4     .4    -.7       9     18     -7     .17
       EMR  |   5 |    9.5   -9.6     .9      -7     36     -9     .25
       ESA  |   5 |     .1    -.9     .1     -25     31     42     .12
       GFZ  |   5 |    -.6    -.3   -1.8     -22     -7     10     .26
       GRG  |   5 |    7.0   -5.4   -2.8      22     22     10     .07
       JPL  |   5 |    7.9   -4.4   10.6       6     35    112     .73
       MIT  |   5 |    1.6  -13.0    7.7     -42     86      6     .56
       NGS  |   5 |   13.3   -6.9   17.9     -76    -23     28     .24
       SIO  |   5 |    2.8   -9.4    7.4      -1     21      0     .20

       COD  |   6 |   -1.0     .8    -.5       8     17     -8     .16
       EMR  |   6 |    6.6   -7.4    4.2      11     34    -35     .25
       ESA  |   6 |    -.1    -.7     .6     -12     20     50     .05
       GFZ  |   6 |    -.1    -.1    -.6       0      5     21     .20
       GRG  |   6 |    4.3   -3.6     .0      27     25     52     .10
       JPL  |   6 |    3.9   -3.7    8.6      21    -29     88     .76
       MIT  |   6 |     .6   -9.0   11.1     -48     82     -2     .36
       NGS  |   6 |    2.7  -14.7   14.5     -75    -13      1     .24
       SIO  |   6 |    1.9   -9.9    8.1       0     21     12     .18


 9. As inidicated in the previous remarks, the IGS final orbits are aligned to the
    IGS reference frame by pre-aligning each AC orbit with the 3 corresponding
    SINEX rotations. This approach began 27-Feb-2000 (GPS Week 1051-0; MJD 51601).
    Starting sometime prior to 19-Aug-2012 (GPS Week 1702; MJD=56158), the orbit
    combination procedures used an incorrect sign convention to apply the SINEX
    RX and RY values to the AC orbits.
    
    Also starting 27-Feb-2000 (GPS  Week 1051-0; MJD 51601), the AC orbits were
    pre-aligned using rotations derived from differences between AC and IGS
    combined x and y polar motion. These ERP rotations were intended to
    approximate day-to-day variations of the AC orbital frames when only weekly
    averaged AC TRF rotations were available (For more details, see IGSMAIL
    #2750). With the change to daily SINEX integrations starting 19-Aug-2012, the
    ERP rotations are no longer needed/applied.

10. Starting 5-Nov-2006 (GPS Week 1400, day 0, MJD 54044) until 16-Apr-2011 (GPS
    Week 1631, day 6, MJD 55667) the absolute antenna model is introduced (IGSMAIL
    #5438). The antenna phase center offsets and phase center variations are given
    in the file:
        ftp://igs.org/igscb/station/general/igs05.atx
    These antenna calibrations are also used in the homogeneously reprocessed IGS
    products from GPS Weeks 730 to 1459 (1994-2007); see IGSMAIL #6136.
    
    Starting 17-Apr-2011 (GPS Week 1632, day 0, MJD 55668) the absolute antenna
    model is updated (IGSMAIL #6255 & #6374) as given in the file:
        ftp://igs.org/igscb/station/general/igs08.atx
    
    The JPL solution did not use IGS08/igs08.atx until GPS Week 1649, which caused
    their RMS clock residuals to be higher during that period than for the other
    centres; from GPS Week 1632 through 1648 the JPL solution is excluded from the
    weekly SINEX combination.
    
    Starting 29-Jan-2017 (GPS Week 1934, day 0, MJD 57782) the absolute antenna
    model file has been updated to igs14.atx to be consistent with IGS14.
    See IGSMAIL #7399 for more information
        ftp://igs.org/pub/station/general/igs14.atx


ORBIT COMBINATION AND EVALUATION STATISTICS:                                    
--------------------------------------------                                    

Most combination statistics are with respect to the combined orbits and
consist of seven parts. The first, Table 1, summarizes all statistics for
the week. It contains means and standard deviations over the week of
satellite ephemeris and clock correction transformation parameters for
each centre (Table 1.1997.a). It also displays the computed satellite
position sigmas for the combined orbits (Table 1.1997.b).
The second part, Table 2, contains the complete ephemeris and clock
correction transformation parameters (includes both the apriori and a
posteriori values) for each centre and each day (Tables 2.1997.[0-6]).
The third part, Table 3, contains two types of daily RMS for each satellite
and centre, along with the computed satellite position sigmas for the
combined orbits (Tables 3.1997.[0-6]). The first type of satellite RMS is
based on orbit combination and the second RMS type is a result of the 7-day
arc evaluation of each centre ephemerides. The fourth part, Table 4, is a
weekly summary of the daily precise navigation summaries for centres
providing both orbit and clock solutions. It contains weekly station RMS
w.r.t. the initial coordinates for the Latitude, Longitude and Height 
components for up to three IGS stations (Table 4.1307). The fifth part, 
Table 5, is similar to Table 4 and contains daily precise navigation
statistics (Tables 5.1997.0-6). The sixth part, Table 6, is a weekly
summary of daily ERP combination statistics. The seventh part, Table 7,
contains the daily ERP statistics. But this is not the IGS official ERP
combination products (which come from the accompanying SINEX combination)
but provided to check combination consistency, etc.

In Tables 1-3, the most important statistic which is meaningful for intra
centre/satellite analysis is labeled WRMS. It is a weighted RMS where
normalized weights are based on accuracy codes given in the SP3 files, and
should not be affected by downweighted/problem satellites when acknowledged
by individual centres in their SP3 file.
                                                                               

             
Table 1: Week 1997 summary.                       (Apr 15, 2018 - Apr 21, 2018)

Table 1.1997.a   GPS week: 1997   MJD: 58223.000-58229.000

         Mean and standard deviations of transformation parameters to the 
         combined IGS orbit.
         WRMS - orbit RMS weighted by the SP3 header accuracy codes.
         STA  - Mean number of stations in the daily solutions.
   
CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  265|    0     0    -5     4     0   -10  -.03   10   10 |    -719     104     11    124
        |    0     0     1    19    12    17   .02           |     117     227
emr   79|    1    -1     2     3     5    34   .15   14   14 |  139000    -332     17    152
        |    2     3     1    11     9    13   .04           |     907     593
esa  150|    0     0    -1    -9     5     7  -.02   11   11 |    -987     -79      7    201
        |    0     1     0    11    15     7   .02           |     679     766
gfz  190|    0     0     3     7     0    -4   .01   11   10 |    -227    -131     11    163
        |    0     0     1    13    14    19   .02           |     305     731
grg  109|    1     0    -6    -4    -2   -15  -.09   12   11 |    -110     175     11    191
        |    0     0     3     9     9    31   .03           |      58     132
igr  n/a|    0     0    -2     9     2    -7  -.03    4    4 |   -4162     514     13     83
        |    0     0     0    15    16    10   .01           |     818     560
jpl   80|   -1     0     2    13     8    46   .18   11   11 |  140768     -64     45    217
        |    0     0     1    25    24    19   .03           |     333     546
mit  349|    0    -2     4    10     3     0   .02   12   11 |    -213    -126     39    286
        |    0     1     1    21    36    17   .02           |     193      98
ngs  211|    0     0     5     2     0    17   .03    9    8 |    -654      -5   1073   2242
        |    0     1     2     9    21    12   .06           |      91     213
sio  346|   -1     1    -2   -12   -15   -31   .00   14   14 |     ---     ---    ---    ---
        |    0     0     1    13    36    42   .03           |     ---     ---


Table 1.1997.b   GPS week : 1997   MJD: 58223.000-58229.000   

         Satellite position sigmas for the combined orbits
         (coded in the IGS SP3 orbit files).
         "E" flags eclipsing satellites.
         Units: mm.

              Day of GPS week
 PRN  |    0    1    2    3    4    5    6 |  Remarks
------+------------------------------------+------------------------------------------
   1  |    4    3    4    4    4    4    3 |
   2  |    5    5    5    5    5    5    5 |
   3  |    4    3    4    3    3    3    4 |
   4  |    0    0    0    0    0    0    0 |
   5  |    5    5    6    5    5    5    5 |
   6  |    4    4    4    4    4    4    3 |
   7  |    5    5    5    5    5    5    5 |
   8  |    4    4    5    5    5    5    4 |
   9  |    4    4    7    4    5    5    4 |
  10  |    4    4    4    3    4    4    4 |
  11  |    4    4    4    4    4    5    4 |
  12  |    5    5    5    5    5    5    5 |
  13  |    4    4    5    5    5    4    5 |
  14  |    5    4    4    4    4    4    4 |
  15  |    5    4    5    4    5    5    5 |
  16  |    5    5    5    5    5    5    5 |
  17  |    5    5    8    6    5    5    4 |
  18  |    4    4    4    4    4    4    4 |
  19  |    6    5    5    5    5    5    5 |
  20  |    5    5    5    5    5    5    4 |
  21  |    5    5    5    5    5    5    5 |
  22  |    5    4    4    4    4    5    4 |
  23  |    5    6    8    5    5    5    5 |
  24  |    3    4    4    4    3    3    3 |
  25  |    3    4    4    6    4    3    4 |
  26  |    3    4    4    3    4    3    4 |
  27  |    4    4    4    3    4    4    4 |
  28  |    5    4    5    4    5    4    4 |
  29  |    5    5    5    5    6    5    5 |
  30  |    3    3    4    3    3    4    3 |
  31  |    5    5    5    4    5    5    5 |
  32  |    4    4    5    4    3    4    4 |



Table 2: Daily transformation of each centre to the combined IGS orbit and
         clocks for each day of the week. The transformation displayed is the
         result of the combination after the AC orbits were pre-aligned using
         the SINEX rotations from above. Prior to Wk 1702, AC ERP rotations
         used in the pre-alignment were also displayed.
         WRMS - RMS weighted by the centres SP3 header accuracy codes.
         STA  - Number of stations in the daily solutions.
   
Table 2.1997.0   GPS week: 1997   Day: 0   MJD: 58223.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  264|    0     1    -5     6     9   -21  -.04   10    9 |    -685      43     10    122
emr   79|    0    -3     4     0     2    36   .12   14   14 |  140215    -219     14    181
esa  150|    1     2    -1    -8   -11     9  -.03   11   11 |   -1178     616      7    171
gfz  191|   -1     0     2    -4    -4   -13   .03   11   10 |    -136    -455     13    122
grg  110|    1     0    -2    10   -12    28  -.12   11   11 |     -23      24     12    183
igr  n/a|    0     0    -3    26    19    -4  -.02    4    4 |   -4445      84     12     81
jpl   80|    0     0     3    27    28    32   .17   12   12 |  141122      10     40    212
mit  349|    0    -3     2     1    21   -30  -.01   12   11 |      27     -93     41    260
ngs  212|    0     0     1    13    13     0   .09   10    8 |    -686      43   1282   2686
sio  349|   -1     0    -1   -15   -23   -16  -.00   15   14 |     ---     ---    ---    ---

Table 2.1997.1   GPS week: 1997   Day: 1   MJD: 58224.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  263|    0     0    -2   -33    -3   -21  -.05   12   11 |    -740      75     15    134
emr   80|    0     0     2    22    22    25   .14   13   13 |  139913    -163     16    192
esa  150|    0     0    -1   -16    24    17  -.05   11   11 |   -1124     981      8    208
gfz  191|   -1     0     1    29    24   -34  -.02   10    9 |    -392     623     11    149
grg  110|    2     1    -7     2     9     2  -.11   11   10 |     -68     135     11    220
igr  n/a|    0     0    -2    21    19   -28  -.03    5    5 |   -4484     245     13     89
jpl   80|    0     0     2    50    51    41   .18   11   11 |  141055    -119     36    221
mit  350|    0    -2     2    11   -29     2   .04   12   11 |    -150    -231     39    282
ngs  209|    0     0     5     1   -22     8   .07    9    8 |    -728      52   1039   2157
sio  349|   -1     1    -1     1   -40   -12   .05   13   14 |     ---     ---    ---    ---

Table 2.1997.2   GPS week: 1997   Day: 2   MJD: 58225.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  265|    0     0    -7    11    -2    16  -.07   11   10 |    -702     130     11    122
emr   80|    6     5     0    -5    -3    56   .10   19   16 |  139698    -402     19    183
esa  150|    0     0     0    -4    -1     0  -.03   12   12 |   -1250    -510      8    220
gfz  192|   -1     0     3    17   -16   -18   .03   11   10 |    -434     571     12    144
grg  114|    0     0    -5    -7     5   -45  -.07   12   10 |    -191     424      9    171
igr  n/a|    0     0    -1    11    19     2  -.03    5    5 |   -4389     236     12     83
jpl   80|   -2     0     4     0    -1    69   .20   12   11 |  140876    -182     81    229
mit  350|    0    -3     5     7    18     3   .04   11   10 |    -456      28     39    258
ngs  210|    0     0     7    -4    15    23   .10   11    9 |    -697     124    869   1833
sio  346|   -1     0    -1   -19    -2   -33  -.00   15   14 |     ---     ---    ---    ---

Table 2.1997.3   GPS week: 1997   Day: 3   MJD: 58226.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  262|    0     0    -6    -1    -2    10  -.01    9    8 |    -604     -82      9    106
emr   80|    1    -2     2     8     0    14   .22   14   14 |  138423     568     18    132
esa  150|    0     0    -2   -30   -11     3  -.00   11   11 |    -363    -248      8    191
gfz  188|    0     0     2    -2    -9    -8  -.00   13   11 |    -478     438     12    172
grg  112|    1     1    -2    -3    -5   -43  -.12   12   11 |     -81     159     10    187
igr  n/a|   -1     1    -3   -17    -2     1  -.05    5    5 |   -5068    1129     13     71
jpl   80|   -1     0     2    32   -14    18   .13   12   11 |  140273     799     40    222
mit  350|    0    -1     4    44    32     2   .00   11   11 |       4    -224     38    267
ngs  214|    0     0     6    -6   -24    39   .02    9    8 |    -651      77   1377   2258
sio  344|   -1     1    -5     4    26   -28  -.03   14   14 |     ---     ---    ---    ---

Table 2.1997.4   GPS week: 1997   Day: 4   MJD: 58227.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  266|    0     0    -4     1    23    -5  -.01   11    9 |    -741     154     13    125
emr   80|   -2    -1     4   -13    10    27   .19   14   14 |  138445    -671     21    106
esa  150|    1     0    -1    -6    25    -3  -.04   11   11 |      35   -1306      7    189
gfz  192|    0     0     3    -1     2     9   .03   10   10 |    -319     -12     11    167
grg  114|    1     0   -11    -2    -2   -22  -.09   12   11 |    -110      67     12    202
igr  n/a|    0     0    -1    -5     0    -2  -.03    4    4 |   -4554     503     14     78
jpl   80|   -1     0     2    -7     7    48   .18   11   11 |  140399    -364     37    219
mit  350|    0    -2     5    28   -37   -12   .03   11   10 |    -383    -213     37    301
ngs  214|    0     1     5    -4    13    20  -.00   10    9 |    -611     -37    944   1932
sio  351|   -1     1    -2    -6   -72   -12  -.02   15   15 |     ---     ---    ---    ---

Table 2.1997.5   GPS week: 1997   Day: 5   MJD: 58228.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  267|    0     0    -7    23   -16   -24  -.01   10    9 |    -610    -145     11    150
emr   80|    0    -1     2     0    -3    44   .15   13   13 |  138350     -73     17    140
esa  150|    1    -1    -2     3     8    10  -.00   11   11 |    -949     269      7    199
gfz  185|    0     0     5    14    -8     6   .03   10    9 |     412   -1179     11    215
grg  103|    1     1    -9   -16   -16   -46  -.08   12   12 |    -142     254     12    190
igr  n/a|    0     0    -2    18   -12    -7  -.02    4    4 |   -3625    1445     15    107
jpl   80|   -1     1     2   -22     6    72   .17   12   12 |  140656     343     41    209
mit  350|    0    -1     3   -22    54     2   .00   12   11 |    -372     -85     41    321
ngs  209|    1     0     7    16   -18    12  -.04    9    8 |    -472    -466    886   2141
sio  346|   -3     1    -2   -27    29     5  -.02   15   15 |     ---     ---    ---    ---

Table 2.1997.6   GPS week: 1997   Day: 6   MJD: 58229.000                            

CENT STA|   DX    DY    DZ    RX    RY    RZ   SCL  RMS  WRMS|    TOFT   TDRFT   SDEV    RMS
        |  [mm]  [mm]  [mm] [uas] [uas] [uas] [ppb] [mm] [mm]|    [ps]  [ps/d]   [ps]   [ps]
--------+----------------------------------------------------+------------------------------
cod  270|    0     0    -5    21    -3   -27  -.01   10   10 |    -954     559     11    112
emr   80|    1    -2     2    10     8    36   .13   14   14 |  137960   -1370     20    131
esa  150|    1    -1    -1     0     7    12   .02   11   11 |   -2086    -357      9    231
gfz  191|    0     0     3     0    12    23  -.01   10    9 |    -242    -908     10    174
grg  102|    1     1    -8   -14     3    17  -.04   11   11 |    -161     162     12    186
igr  n/a|    0     0    -1    14   -22   -10  -.03    4    4 |   -2575     -41     13     72
jpl   80|    0    -1     1    17   -19    40   .21   11   11 |  140999    -940     40    209
mit  350|    0     0     4     4   -32    27   .01   12   11 |    -164     -64     41    313
ngs  212|    0    -1     6     3    25    16  -.06    9    7 |    -738     172   1115   2691
sio  343|   -1     1    -2   -28   -25  -122   .02   13   12 |     ---     ---    ---    ---

       
       
Table 3: Daily fit for each satellite and each centre resulting from weighted
         average combination and from long arc orbit dynamics (7-day). The
         first IGS column gives resulting satellite accuracy measures found in
         SP3 header. The last IGS column gives the RMS fit of the IGS orbit
         when processed through the 7-day arc evaluation.

         "E"    stands for eclipsing satellites (earth).
         "M"    stands for eclipsing satellites (moon).
         "X"    stands for excluded from the statistics but included in IGS orbit.
         "T"    stands for Total long arc orbit RMS for all satellites.
         "NE"   stands for long arc orbit RMS for Non-Eclipsing satellites only.
         "MEDI" stands for median of the centre's satellite RMS.
         "MD"
         Units: mm.

Table 3.1997.0   GPS week: 1997   Day: 0   MJD: 58223.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    9   10   11    7    5    3   13   10    8   14    3 |    35   39   33   34   33   33   39   36   34   39    34
   2  |    8   10   13   14   10    4   12   16   12   20    5 |    23   25   22   32   24   24   25   32   30   27    24
   3  |    9   11   13    7    7    3   14   10    8   10    3 |    28   30   30   26   26   27   33   24   26   26    26
  X4  |    3  ---  ---  ---  ---   30  ---  ---  ---  ---    0 |    25  ---  ---  ---  ---   40  ---  ---  ---  ---    26
   5  |    9   12   15   13   11    3   11   18   11   18    5 |    72   73   74   65   72   68   71   64   66   69    68
   6  |    6    8   13   10    7    3    8    7    8   12    3 |    91   94   93   94   92   92   94   93   93   95    93
   7  |   11   11   11   10   12    4   12   12   11   16    4 |    41   41   39   38   43   38   44   36   38   36    38
   8E |   13   11   10    9   14    3   12    9    9   11    4 |    19   21   25   19   21   20   23   22   20   25    20
   9E |   10   11   10   13    8    5   13   10    9   12    4 |    28   30   31   30   27   27   30   30   26   28    27
  10  |    7    8   10    7    9    3    7   16    7   12    3 |    78   83   82   80   78   79   80   79   81   83    80
  11  |    9   13   19    8    7    3   11   11    8   12    4 |    26   40   26   33   31   32   38   34   37   33    31
  12  |    9   22   10   16   14    6   16   11   11   18    5 |    28   34   29   27   30   26   33   31   31   31    28
  13E |    9   15    9   11   12    3   12   11    9   14    4 |    52   52   53   52   45   53   51   54   55   57    52
  14E |    6   14    7   11   19    4   11   13    8   15    4 |   115  117  115  117  115  116  116  116  119  118   116
  15E |    6   21    9    9   12    3   19   12   13   11    4 |    48   50   46   44   46   45   48   45   48   43    46
  16  |   10   23    9   15   13    5   15   13   10   17    5 |    28   32   28   28   27   26   30   28   26   24    26
  17E |   13   14    8   13   19    6   12   13   11   15    5 |    28   20   77  263   27   78   22   77   18   19    78
  18  |   10    9   12    7    6    4    7   13    6   14    3 |    31   36   30   35   33   34   33   34   38   34    33
  19  |   17   16    8   13   22    7   12   14   11   15    5 |    42   44   42   47   44   45   43   43   48   46    43
  20  |   11   12   12   13   12    4   11   12   13   21    5 |    38   38   35   41   38   38   37   38   42   37    37
  21  |   11   10   12   12    8    3   11   17   12   23    5 |    21   27   19   31   23   24   25   34   32   36    26
  22  |   14   11   12    9   10    4   10   11   10   14    4 |    31   36   30   35   32   32   33   37   35   35    32
  23E |    7   23    8   10   10    6   14   10   11   11    4 |    61   63   58   61   55   59   54   62   60   59    59
  24  |    8    7   11    5    8    4   10   12    6   11    3 |    65   66   64   62   66   63   65   65   64   64    64
  25  |    6   10    7    9    9    4   10    6    7   12    3 |    52   50   52   48   47   51   51   48   50   47    49
  26  |    5   10    5   10    9    4    9    6    8    9    3 |    91   91   93   92   90   91   90   91   90   89    90
  27E |    9   11   10    9   11    4   10    7    5   12    3 |    20   21   25   20   20   20   23   23   20   23    20
  28  |    9   11   10   10   11    5   14   13   10   18    4 |    22   25   17   23   21   23   24   24   27   23    21
  29E |   17   22    7   13   11    5   17   13   11   14    5 |    65   63   66   67   69   66   68   68   69   65    66
  30  |    8    9    9    6    6    3   11   11    8   10    3 |    30   31   29   28   27   27   32   32   27   32    28
  31  |    9   15   12   10   12    4   13   15   13   18    5 |    49   49   46   46   45   45   49   43   46   45    45
  32E |    7   11    9   11    8    3    9   16    9   13    4 |    41   43   43   42   42   41   43   43   44   43    42
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   14   11   11   11    4   12   12   10   15      |T   44   47   46   53   44   46   46   47   46   46    45
 WRMS |    9   14   11   10   11    4   12   11    8   14      |NE  43   47   43   44   43   43   46   45   45   45    42
 MEDI |    9   11   10   10   10    4   12   12    9   14      |MD  35   40   39   41   38   38   39   38   38   37    37

Table 3.1997.1   GPS week: 1997   Day: 1   MJD: 58224.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    8    7   12    7    5    5    9   10    7   12    3 |    35   36   31   29   33   31   36   36   32   38    33
   2  |    8    9   13   11    9    4   10   14    9   19    4 |    19   18   17   23   18   19   20   25   22   20    17
   3  |    8    8   12    7    6    4    8    9    3    9    3 |    23   27   24   22   22   24   29   21   25   24    22
  X4  |    2  ---  ---  ---  ---   34  ---  ---  ---  ---    0 |    31  ---  ---  ---  ---   26  ---  ---  ---  ---    31
   5  |   10    9   15   12   12    5   11   15   10   20    5 |    56   57   57   58   58   57   59   54   55   57    55
   6  |    9    6   14    6    7    4    8   11    7   12    3 |    74   78   78   75   75   75   77   77   79   81    77
   7  |   13    9   13   11   10    5    9    9   10   17    4 |    34   33   30   30   32   30   35   31   30   31    30
   8E |   13   12   10    6   14    5   10    6   11   10    4 |    18   18   20   18   22   17   20   22   18   22    18
   9E |   13   13   10    8   13    5   12   10    7   12    4 |    31   26   27   28   25   26   25   25   27   24    25
  10  |   11    7    9    6    7    4    8   15    6   12    3 |    68   73   70   72   71   70   70   71   72   75    71
  11  |   10   10   16    7    8    4   11   10    9   10    4 |    23   33   21   26   25   25   34   27   30   26    25
  12  |   13   18   10   15   12    6   12   14   11   17    5 |    22   22   19   23   21   21   24   26   25   23    20
  13E |   12   10    8   10   11    3   10   15   10   11    4 |    39   36   38   40   39   38   38   38   38   41    38
  14E |   14   12    7   11   10    4   10   13   10   13    4 |    89   88   88   90   90   91   91   90   91   91    90
  15E |    8   17    6   11    9    4   14   16    8   10    4 |    41   38   37   38   39   38   39   40   35   37    37
  16  |   15   21    8   13   15    7   12   13   11   14    5 |    26   26   23   24   23   21   27   25   24   22    22
  17E |   11   14    8   10   19    5   12   14    8   13    4 |    23   19   78  356   28   79   22   80   20   21    79
  18  |   13    7   12    6    6    4    8   12   10   12    3 |    26   31   26   32   27   29   31   31   33   31    29
  19E |   11   15    6   12   18    5   11   11    7   13    4 |    31   31   30   36   27   33   35   37   36   35    31
  20  |   10   10   13   11   12    5   10   12   10   20    4 |    35   33   30   33   34   35   34   32   33   32    31
  21  |   13   12   14   11    9    5   11   16   10   17    5 |    21   25   15   26   19   22   21   28   26   31    22
  22  |   11    8   13    8   11    5    9   11    8   14    4 |    25   31   26   28   26   28   31   28   29   28    26
  23E |   25   23    8   10   11    5   15    7    9   12    5 |    60   48   47   53   46   50   48   48   51   47    49
  24  |    7   12    9    8    8    4    9   18    9   10    4 |    56   55   54   52   55   54   54   54   56   53    54
  25  |    9   11    8    9   11    3    8    8    7    8    3 |    44   46   45   41   41   43   46   43   45   43    42
  26  |   18   11    7    7    8    3   11    9    6   11    3 |    79   81   81   81   80   80   84   80   81   78    79
  27E |   21   12    8    6   15    5   10    6    8   10    4 |    33   20   23   18   18   18   20   21   21   20    20
  28  |   12   10   10    9   10    6    9   13    9   19    4 |    22   25   20   23   20   23   26   24   27   22    20
  29E |   10   22    7   12   15    7   17   12   10    7    4 |    48   43   44   47   44   45   44   48   51   47    46
  30  |   10   10   10    7    7    4   10    6    7    9    3 |    28   28   26   24   24   24   29   29   24   26    25
  31  |   14   13    9   11   13    7   12   16   12   17    5 |    42   42   38   43   39   42   42   39   42   43    39
  32E |   10    7   10    8   10    4    9   20    9   14    4 |    32   33   32   32   28   31   32   32   32   34    30
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   12   13   10   10   11    5   11   12    9   13      |T   38   38   38   49   37   38   39   40   39   38    38
 WRMS |   11   13   11    9   10    5   11   11    8   14      |NE  37   40   36   38   37   37   40   39   39   39    36
 MEDI |   11   11   10    9   10    5   10   12    9   12      |MD  32   33   30   32   28   31   34   32   32   32    31

Table 3.1997.2   GPS week: 1997   Day: 2   MJD: 58225.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    8   11   14    8    6    6    8    9    7   11    3 |    33   42   33   33   31   34   39   37   37   34    33
   2  |   11   16   15   13   12    5   11   11   13   19    5 |    21   21   20   25   18   17   22   23   24   22    19
   3  |    9   10   12    6   10    5    8    8    9   10    3 |    26   34   30   29   30   29   33   28   32   29    28
  X4  |    4  ---  ---  ---  ---   28  ---  ---  ---  ---    0 |    22  ---  ---  ---  ---   26  ---  ---  ---  ---    24
   5  |   14   14   16   13   14    6   13   14   14   20    5 |    56   58   54   46   55   51   49   51   54   58    52
   6  |    8   14   15    7    9    3    7   10    7   13    4 |    84   84   82   82   84   83   87   89   83   83    83
   7  |   14   16   11   15   10    5   11   10   10   16    5 |    38   38   31   34   34   32   36   34   33   31    32
   8E |   10   16   11    8   19    5   11   11   11   10    4 |    22   25   23   20   26   19   21   21   25   22    20
   9E |   17   43   13   14   20    5   14   14   11   12    7 |    20   47   21   21   24   17   20   19   19   18    16
  10  |    9   12   11    7    7    4    7   15   11   15    4 |    65   70   66   65   65   65   69   68   65   67    66
  11  |   10   16   17   11    9    4   11    8    8   10    4 |    22   33   21   26   22   23   33   27   28   26    23
  12  |   10   22   12   16   12    4   13   11   10   21    5 |    23   24   24   26   24   23   28   26   26   23    22
  13E |    9   18   11    7   10    7   13   10   11   18    4 |    31   33   28   27   33   28   27   28   30   34    28
  14E |    7   15    7    9   10    6   14   13   10   13    4 |    67   62   65   66   65   64   61   63   68   68    65
  15E |    9   20    9   11   10    4   18   11   13   14    4 |    30   31   25   30   29   26   29   28   31   32    28
  16  |   10   23    8   14   16    4   16   11   12   17    5 |    21   24   21   23   21   19   21   21   22   23    19
 X17E |   10  ---    9  ---  ---    8  ---   13  ---  ---    8 |    28  ---  202  ---  ---  202  ---  203  ---  ---   202
  18  |    9   11   13    7    6    4    8   11    8   12    3 |    28   28   24   26   25   26   27   30   29   31    27
  19E |   18   17    8   12   16    5   12   11   12   14    5 |    28   30   26   30   28   29   30   32   33   33    28
  20  |    8   11   12   11   11    4   10   11   13   21    4 |    33   34   33   35   31   33   33   36   42   40    34
  21  |   10   13   15   12    9    3   10   15   12   17    5 |    21   27   21   30   21   24   26   31   30   28    24
  22  |    9   11   13   10   12    6    9   10   11   14    4 |    27   30   26   30   28   28   30   32   32   32    28
  23E |   11   54    9   17   15    7   14   12   14   14    7 |    28   54   35   40   33   35   34   36   35   37    33
  24  |    8   12   11    7    9    3   10   10    7   15    3 |    62   64   61   62   64   62   59   65   62   68    63
  25  |    9   11    9   10    9    3    8    7    9   13    3 |    47   45   46   42   46   45   44   47   48   50    45
  26  |    8   13    5    8   13    3    7    7    7   12    3 |    72   71   73   72   74   72   72   75   72   77    73
  27E |   10   13   12    7   13    5   11    6   11   10    4 |    21   27   22   21   18   20   24   20   24   17    19
  28  |   10    9   12   10   11    6   12   12   12   17    4 |    25   26   20   23   23   21   26   21   26   23    21
  29E |   16   19    6   12   14    4   17   11   11   10    4 |    37   42   38   44   39   40   40   41   41   37    39
  30  |    8   15    8    8    8    5   12    5   10   12    3 |    25   29   26   28   26   26   31   28   29   32    26
  31  |    8   15   11   10   12    4   13   12    9   17    4 |    38   44   39   37   39   37   44   35   37   35    37
 X32E |    8  ---   11   10   16    4   10   14    9   14    5 |    25  ---   25   25   23   22   21   24   25   25    23
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   11   19   12   11   12    5   12   11   11   15      |T   35   40   40   36   35   39   37   42   38   37    40
 WRMS |   10   16   12   10   10    5   11   10    9   14      |NE  37   41   37   38   38   36   40   40   40   40    37
 MEDI |    9   15   11   10   11    5   11   11   11   14      |MD  28   34   28   30   29   28   31   32   32   32    28

Table 3.1997.3   GPS week: 1997   Day: 3   MJD: 58226.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    5    7   12    9    6    4    9   12    8   11    3 |    20   29   20   19   21   20   29   26   27   26    22
   2  |    8   13   16   15   10    3    8   13   14   18    5 |    18   21   20   23   20   19   22   25   22   25    19
   3  |    7    9    9    7   10    5   10    8    6   10    3 |    28   30   26   22   25   27   31   25   27   26    25
  X4  |    3  ---  ---  ---  ---   23  ---  ---  ---  ---    0 |    23  ---  ---  ---  ---   25  ---  ---  ---  ---    24
   5  |   10   13   15   14   13    5   16   15   13   19    5 |    45   47   47   36   44   40   46   41   35   47    41
   6  |    6    9   14    8    7    4   11    8    8   10    3 |    39   42   37   35   38   37   43   42   41   44    39
   7  |    9   10   11   12    8    5   10   14    9   19    4 |    27   30   24   26   25   21   27   25   24   20    23
   8E |    9   20   10    8   18    4    9    6   10    8    4 |    19   23   23   21   24   18   20   20   22   24    19
   9E |   10   17   10    7    9    3   13    7    7   13    3 |    23   25   25   23   19   20   26   23   24   25    21
  10  |    5    6   10    7    8    4    8    9    5   13    3 |    28   32   30   28   29   28   33   31   29   36    30
  11  |    6   12   16   10   12    5   10   10    8   12    4 |    27   37   23   32   31   29   36   33   35   31    30
  12  |    9   18   11   16   13    6   16   14    9   20    5 |    27   29   24   25   25   24   27   27   25   23    23
  13E |    9   18   10    9   19    6   11   10    8   15    4 |    61   55   52   54   54   53   55   54   54   57    54
  14E |    4   11    7   12   12    8   10   11   12   10    3 |    38   37   36   37   38   33   36   33   38   37    36
  15E |    6   17    9   13   14    5   18   11   10   12    4 |    30   30   29   31   35   27   29   32   29   33    29
  16  |    9   23    7   15   15    6   14   12   10   17    5 |    19   24   17   19   23   17   20   18   20   20    18
 X17E |   11  ---    9   11  ---    9  ---   11  ---  ---    6 |    35  ---   31   33  ---   32  ---   32  ---  ---    32
  18  |   10    9   11    8    8    5    9   11    8   13    3 |    21   24   18   24   23   22   22   26   25   29    22
  19E |   18   18    8   13   13    5   13   13   10   16    5 |    30   31   31   35   31   31   31   37   34   33    31
  20  |   10   13   13   14   11    5   11   15   11   22    5 |    20   23   19   22   20   19   20   28   25   27    20
  21  |   11   12   15   13    7    4   10   13   10   18    4 |    17   22   15   26   20   19   21   26   23   25    19
  22  |    9    9   12   12   14    6    8   13    8   14    4 |    19   23   17   25   19   21   24   25   23   23    19
  23E |    8   22    8    9   13    5   14   10    9   14    4 |    31   35   34   37   33   34   34   36   35   36    33
  24  |    6   13    9    9    9    3   13    6    7   15    3 |    34   36   34   34   33   33   34   37   35   45    35
  25  |   10   13   10   37    9    5    9   10    9   14    6 |    28   32   30   54   29   29   30   32   31   36    32
  26  |    4    9    6    8   10    4    7    8    6   10    3 |    41   44   42   38   45   40   44   39   43   48    42
  27E |    5   11    9    8   13    3   10    6    7    9    3 |    19   22   23   20   23   18   21   19   20   17    19
  28  |    7   12    9   12   11    6   10   13    7   21    4 |    23   27   19   24   22   22   25   22   24   23    21
  29E |   14   24    7   15   13    5   18   14   11   10    5 |    31   30   31   36   32   32   30   31   36   30    31
  30  |    7   13    8    6    7    3   10    7    6   12    3 |    22   34   25   24   27   23   28   24   24   32    25
  31  |   10   13   11   12   10    4   12   11   11   14    4 |    36   35   31   29   32   30   34   28   30   28    30
  32E |    6    8   11    8   14    4    9   13    9    9    3 |    20   24   24   20   22   19   19   20   22   19    20
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   14   11   13   12    5   12   11    9   14      |T   28   31   27   29   28   26   29   29   29   30    27
 WRMS |    8   14   11   11   11    5   11   11    8   14      |NE  26   31   25   28   27   25   29   29   28   30    26
 MEDI |    8   13   10   11   11    5   10   11    9   13      |MD  27   30   25   26   25   25   29   28   27   28    25

Table 3.1997.4   GPS week: 1997   Day: 4   MJD: 58227.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    6   10   11    8    5    3   10   11    6   12    3 |    31   35   29   27   27   29   34   32   32   33    30
   2  |   10    9   14   13   13    3    9   12   11   19    4 |    17   19   17   23   18   18   18   26   22   28    18
   3  |    9    9   11    7    9    4   10    8    5   11    3 |    26   32   30   29   29   30   32   31   30   31    28
  X4  |    2  ---  ---  ---  ---   21  ---  ---  ---  ---    0 |    25  ---  ---  ---  ---   29  ---  ---  ---  ---    24
   5  |   11    9   14   12   13    5   10   13   11   18    4 |    56   51   54   48   56   49   52   49   48   57    51
   6  |    7    8   12   10    8    3    8    9    9   11    3 |    76   79   78   77   76   78   79   76   76   76    77
   7  |   11   10    9   13   10    4   11   13   11   18    4 |    34   35   31   33   33   30   35   33   30   30    31
   8E |    9   18   10    7   19    3    9   13   12   18    5 |    20   25   23   18   22   18   20   27   19   24    19
   9E |   17   18   11    9   12    5   15    8    7   13    4 |    23   27   27   21   24   22   25   25   24   27    22
  10  |    7    9   10    8    8    3    8   10    7   15    3 |    61   67   62   62   61   61   63   61   62   65    62
  11  |    6   12   15   10   11    4   10    9   10   11    4 |    25   32   23   26   24   26   33   29   30   26    25
  12  |    9   18   12   15   12    5   14   11    9   18    5 |    24   31   23   25   23   23   26   29   26   27    24
  13E |   22   15    8   10   11    5   13   11   12   13    5 |    38   35   37   37   37   36   35   40   39   41    36
  14E |    8   11    7    8   14    3   12   13    8    9    3 |    66   61   61   63   65   64   61   65   68   66    64
  15E |    8   23   10   12   16    4   17   14   11   12    5 |    36   34   29   35   41   31   35   31   34   32    32
  16  |    7   23   10   16   13    5   14   11   10   15    5 |    22   24   22   22   21   20   22   22   21   21    20
  17E |   14   14    7   11   19    5   14   13   12   14    5 |    32   27   27   27   30   27   28   32   24   28    28
  18  |    9    8   10    8    7    4    8   11    8   13    3 |    22   26   23   26   24   24   25   27   28   30    24
  19E |   14   16    6   11   21    4   10   11   14   16    5 |    31   34   33   36   27   33   34   36   36   35    32
  20  |   14    9   13   14   10    5   11   12   11   19    5 |    34   32   31   34   32   32   32   36   35   37    32
  21  |   12   12   16   11    9    4   10   13   13   20    5 |    23   28   21   32   22   26   24   31   34   32    26
  22  |    9    9   14   10   12    5   10   11    8   14    4 |    23   28   26   29   26   28   29   29   28   30    26
  23E |   11   19   10   11   13    6   11   12   10   14    4 |    37   38   40   44   38   42   37   43   41   43    39
  24  |    8   11   10    9    7    3   12    6    8   12    3 |    60   57   56   57   58   56   57   56   58   60    57
  25  |    9   10   10    6    9    3    8    8   11   13    3 |    46   43   45   49   45   43   45   45   48   46    45
  26  |    6   10    7   11   10    2    7   10    8   14    3 |    76   76   79   77   77   77   76   77   76   80    77
  27E |   12   13   10    5   15    4    9    8   10   12    4 |    20   23   22   18   17   18   19   19   20   17    17
  28  |    7   12   10   10   15    5   11   15   11   18    4 |    24   24   20   23   19   21   24   29   25   21    20
  29E |   16   22    8   13   15    5   14   13   14   14    5 |    31   35   32   35   31   34   34   36   38   35    33
  30  |    8   10    7    9    7    4    9    4    8   16    3 |    28   30   26   26   29   26   30   30   26   34    27
  31  |   13   15   12   10   10    3   14   10   11   14    4 |    34   37   31   34   29   32   37   33   29   32    31
  32E |    6   10   10    6   12    2   10   10    6    9    3 |    28   23   27   26   24   25   26   28   27   29    25
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   11   14   11   10   12    4   11   11   10   15      |T   35   37   35   36   35   34   36   37   36   37    34
 WRMS |    9   14   11   10   11    4   11   10    9   15      |NE  36   39   36   37   36   36   38   39   38   39    35
 MEDI |    9   11   10   10   12    4   10   11   10   14      |MD  31   32   29   32   29   29   33   32   30   32    28

Table 3.1997.5   GPS week: 1997   Day: 5   MJD: 58228.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    5    8   11    7    8    3   11   11    6   17    3 |    23   26   22   20   21   21   28   26   20   30    21
   2  |   10   10   12   12   14    4   14   13   11   20    4 |    32   32   33   36   31   32   32   35   33   38    32
   3  |    6    8   13    8    9    6    9    7    6   11    3 |    31   31   30   31   29   28   34   27   31   32    29
  X4  |    4  ---  ---  ---  ---   28  ---  ---  ---  ---    0 |    25  ---  ---  ---  ---   22  ---  ---  ---  ---    25
   5  |   10    9   16   11   11    4   13   13    9   18    4 |    52   51   54   48   51   49   54   49   46   54    50
   6  |    7    7   13    7    9    3   12   10    8   11    3 |    47   49   46   47   45   46   51   48   50   50    47
   7  |   11   12   11   12   12    4   10   14   10   23    5 |    28   34   29   32   32   29   33   31   30   34    29
   8E |    9   22   11    8   18    4    9    8    8   12    4 |    16   26   20   19   22   16   19   16   17   20    17
   9E |   17   10   12    7   11    4   12   10    7   15    4 |    29   29   29   31   29   29   30   29   31   34    28
  10  |   10    8   11    8    7    4    7   10    6   15    3 |    48   48   48   51   45   47   47   46   48   51    47
  11  |    7   14   18   12   11    4   10   11    9   16    4 |    20   29   21   25   21   21   30   27   26   26    22
  12  |   11   19   10   13   12    5   14   13   12   16    5 |    26   27   24   26   22   23   24   27   24   26    23
  13E |   13   16    9    8    6    4   11   14    7   12    4 |    75   76   76   77   76   77   77   79   75   79    76
  14E |    8    9    7    7   13    4   12   14    7   11    3 |    77   78   80   78   76   80   81   80   80   83    79
  15E |    7   19    9   11   10    4   18   16    9   11    4 |    39   43   38   39   43   37   40   39   36   39    38
  16  |   12   21   11   13   12    5   12   14   11   17    5 |    25   21   23   22   19   20   22   19   22   19    19
  17E |   12   16    8   11   18    5   14   12   10   12    4 |    27   28   26   26   28   25   26   28   25   23    26
  18  |    7    8   12   10   10    4    9   12    6   18    4 |    26   28   27   30   26   27   29   30   28   29    27
  19E |   12   16    6   10   22    4   14   11   11   15    5 |    27   27   27   29   23   28   27   31   33   30    27
  20  |    9    9   13   12   10    5   12   15   15   19    5 |    34   37   35   35   35   36   36   33   38   41    35
  21  |   11   11   14   12   10    4   10   14   10   17    4 |    18   24   18   28   17   22   22   27   25   26    20
  22  |   11   10   15   10   13    5    8   13   10   14    4 |    34   35   34   36   31   32   37   34   36   38    34
  23E |   10   22   10   11   15    6   16   12    9   14    5 |    42   40   45   49   43   44   45   47   45   47    44
  24  |    7    8    9    7    9    4   12    7    7   10    3 |    59   58   56   56   60   56   58   57   55   59    57
  25  |    6   10    9    7   10    3    8    9    9   10    3 |    31   34   34   36   30   33   33   29   32   35    32
  26  |    5    9    7    7    7    3    8   12    8   15    3 |    54   59   57   57   57   57   57   60   55   56    56
  27E |   10   10   10    9   14    4   11    8    9   13    4 |    17   21   20   17   17   17   19   17   21   14    16
  28  |    8   12   10    9   11    4   12   11    9   19    4 |    24   24   19   22   21   20   24   20   25   22    20
  29E |   15   21    7   12   14    5   18   15   13   10    5 |    42   43   43   49   45   44   43   47   48   41    44
  30  |    7    9   10    6    7    2   10    6    8   17    3 |    23   29   27   25   25   24   30   26   24   33    25
  31  |   11   13   12   10   11    5   12   11   11   14    4 |    26   32   27   29   26   27   31   27   29   33    27
  32E |    8   10   10    7   13    3    9   12    6   11    3 |    31   34   38   33   32   34   33   34   36   39    34
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   13   11   10   12    4   12   12    9   15      |T   34   37   35   36   34   34   37   36   36   38    34
 WRMS |    9   13   11    9   12    4   12   11    8   15      |NE  32   35   33   34   32   32   35   33   33   36    32
 MEDI |    9   10   11   10   11    4   12   12    9   15      |MD  29   32   30   32   30   29   33   31   32   34    29

Table 3.1997.6   GPS week: 1997   Day: 6   MJD: 58229.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    5    8   12    7    6    3    7   11    5   13    3 |    34   38   31   32   33   33   38   38   32   44    33
   2  |   10   12   12   13   13    4   12   14    9   20    4 |    31   31   31   34   31   31   34   33   33   37    30
   3  |   14    9   14    6    5    4   10    9    5    9    3 |    33   34   33   31   30   31   37   29   33   34    31
  X4  |    3  ---  ---  ---  ---   24  ---  ---  ---  ---    0 |    35  ---  ---  ---  ---   40  ---  ---  ---  ---    35
   5  |   13   12   14   12   10    4   11   13   10   18    4 |    70   66   71   60   69   63   68   59   60   67    64
   6  |    5    8   11    9    7    3    9    9    6   10    3 |    73   74   75   75   72   73   75   77   72   78    74
   7  |    8   12   10   12   13    4   10   13   10   19    4 |    40   42   41   42   42   40   44   40   41   41    40
   8E |    8   18   10    8   15    3   10    7    7   11    4 |    31   31   30   27   34   28   30   29   30   36    30
   9E |    8   14   11    9   12    4   10    8    6   10    3 |    23   26   28   26   24   24   27   26   27   27    24
  10  |   10    8   13    7    7    4    6   11    8   13    3 |    63   65   66   62   61   63   63   65   65   66    63
  11  |    6   12   18   11   11    3    9   12    7    9    4 |    34   43   30   38   33   35   43   40   38   38    36
  12  |   11   20   11   12   14    5   13   13   10   17    5 |    35   39   35   30   32   30   35   34   32   35    32
  13E |   12   18   10   11    9    4   10   17    8   10    4 |    64   67   68   66   66   66   67   70   70   66    67
  14E |    9   11    9   10   14    3   11   11    9   11    4 |    91   91   91   93   92   92   90   94   97   91    92
  15E |    9   20    9   10   10    4   14   20    9    9    4 |    36   33   29   32   37   30   34   33   33   30    32
  16  |    9   22   10   13   11    4   13   12   11   18    5 |    30   31   29   31   27   29   29   29   32   33    29
  17E |   12   14    7   10   16    4   15   12    7   10    4 |    43   29   37   39   32   38   31   37   25   29    38
  18  |    5    7   13    9    8    2    8   10    6   13    3 |    29   31   26   32   29   29   33   33   33   39    30
  19E |   17   14    7   10   15    5   13   11    9   13    4 |    37   40   44   49   33   44   40   48   47   49    42
  20  |   10    8   13   12   12    4   10   12    9   14    4 |    38   38   38   43   39   41   38   41   45   44    40
  21  |   15    9   15   14   11    5    9   14   13   18    5 |    25   29   22   32   26   26   27   36   30   35    26
  22  |    9    9   15    9   11    4    9   11    9   13    4 |    35   38   35   37   33   35   39   36   38   39    35
  23E |   11   21    7   11   15    7   14   11    8    8    4 |    44   39   41   46   40   43   39   47   45   44    42
  24  |   10   11    8    7    5    3    8    7    6    8    3 |    66   64   63   63   67   64   64   66   62   67    64
  25  |   10   12    9    7    9    4    8    6   11    9    3 |    40   42   42   45   39   41   41   42   43   46    41
  26  |    9   10    7    9    8    4    9   10    9   12    3 |    73   73   74   73   72   74   72   76   71   74    73
  27E |   10   10   11    7   14    4   12   11    7    8    3 |    34   34   34   34   29   33   33   32   33   37    32
  28  |    7   12   10   10   13    5   11   11   10   16    4 |    27   29   26   33   30   29   30   29   32   32    28
  29E |   15   23    7   11   15    4   16   11   10   11    5 |    72   72   76   78   75   75   75   78   79   80    76
  30  |    7   11    7    8    9    4    9    6    8   13    3 |    29   30   29   30   28   27   33   29   28   34    28
  31  |   17   13   13   11   11    4   12   18   10   17    5 |    37   37   35   32   34   33   42   36   33   35    33
  32E |    8   11   10    8   12    3    8    9    8    9    3 |    27   29   32   31   29   29   30   32   31   32    29
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   14   11   10   11    4   11   12    9   13      |T   43   44   43   44   42   42   44   44   44   46    42
 WRMS |   10   14   11    9   11    4   11   11    7   12      |NE  41   43   41   42   41   41   44   43   42   45    41
 MEDI |    9   12   10   10   11    4   10   11    9   12      |MD  35   38   35   37   33   35   38   37   33   39    35



Table 4: Precise Navigation Summary.

         Weekly station RMS w.r.t. the estimated coordinates for the Latitude,
         Longitude and Height components. See Table 5 for the daily summary.

         CLK  - Satellite clocks used.
         EPO  - Mean number of satellite clock epochs available in the daily
                solutions.
         Units: mm.

Table 4.1997   GPS week: 1997   MJD: 58223.0-58229.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3055 |U    7     7    27 |U   10    11    37 |U    8    11    34 |
emr | emr 2934 |U   16    14    35 |U   15    17    43 |    15    16    46 |
esa | esa 2976 |     8     9    29 |U   10    11    37 |U    9     9    34 |
gfz | gfz 2961 |U    9     7    28 |U   10    10    40 |U    9    10    32 |
grg | grg 2948 |    11    10    28 |    11    12    44 |     8    13    39 |
igr | igr 2975 |     9     8    27 |    10    10    37 |     8    10    34 |
igs | igs 2975 |     9     8    26 |    10    10    38 |     8    11    35 |
jpl | jpl 2948 |    15    15    35 |U   14    16    42 |U   15    17    46 |
mit | mit 2976 |    11    11    26 |U   13    11    44 |U   38    16    60 |



Table 5: Daily Precise Navigation Summary using the corresponding Centre orbit 
         positions and satellite clock corrections at 15 min intervals.

         Each line gives the daily station RMS w.r.t. the estimated coordinates 
         for the Latitude, Longitude and Height components.
        
         CLK  - Satellite clocks used.
         EPO  - Number of satellite clock epochs available for that day.
         Units: mm.

Table 5.1997.0   GPS week: 1997   Day: 0   MJD: 58223.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3072 |     8     7    27 |    10    14    34 |     7    11    25 |
emr | emr 2976 |    17    11    43 |    16    16    29 |    14    11    28 |
esa | esa 2976 |     9     8    28 |    12    14    34 |     9     9    24 |
gfz | gfz 2976 |     9     8    29 |    13    15    39 |     9     9    24 |
grg | grg 2976 |    11    12    24 |    11    15    41 |     6    10    30 |
igr | igr 2976 |     9     7    28 |    11    13    32 |     8     9    24 |
igs | igs 2976 |     9     8    25 |    12    13    33 |     8    10    23 |
jpl | jpl 2976 |    13    12    42 |    15    14    33 |    16    15    33 |
mit | mit 2976 |    10    11    25 |    14    15    38 |     8    11    28 |

Table 5.1997.1   GPS week: 1997   Day: 1   MJD: 58224.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3069 |     7     5    30 |    11    10    37 |     8    13    34 |
emr | emr 2976 |    13    11    46 |    15    14    37 |    13    16    35 |
esa | esa 2976 |     7     7    28 |    12    11    36 |     9    12    31 |
gfz | gfz 2971 |     7     8    26 |    11     8    37 |     7    10    31 |
grg | grg 2976 |    10     9    32 |    12    10    42 |     8    14    38 |
igr | igr 2976 |     8     7    28 |    11     9    37 |     7    10    31 |
igs | igs 2976 |     8     7    29 |    12     9    38 |     7    12    32 |
jpl | jpl 2976 |    11    13    36 |    13    11    37 |    13    15    42 |
mit | mit 2976 |     9    12    26 |    13    11    54 |    10    11    35 |

Table 5.1997.2   GPS week: 1997   Day: 2   MJD: 58225.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3071 |     8     8    27 |     9    10    37 |    10    11    31 |
emr | emr 2784 |    29    27    37 |    15    18    53 |    19    16    51 |
esa | esa 2976 |     8    11    27 |     9    11    39 |    10     9    32 |
gfz | gfz 2880 |     9     7    23 |     9     9    38 |    13    12    27 |
grg | grg 2880 |    11    10    22 |    11    12    42 |    12    14    30 |
igr | igr 2976 |     7     8    26 |     8     9    34 |    10    10    33 |
igs | igs 2976 |     9     8    25 |     9     9    37 |     9    11    33 |
jpl | jpl 2880 |    24    22    35 |    20    32    67 |    26    23    52 |
mit | mit 2976 |     9    12    24 |    13    10    47 |    10    11    37 |

Table 5.1997.3   GPS week: 1997   Day: 3   MJD: 58226.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2971 |     7     8    28 |    12    14    40 |     8    11    28 |
emr | emr 2880 |    13    12    30 |    19    22    45 |    15    18    46 |
esa | esa 2976 |  ----  ----  ---- |  ----  ----  ---- |  ----  ----  ---- |
gfz | gfz 2975 |     8     5    30 |    10    11    43 |     9    10    28 |
grg | grg 2880 |    12     7    29 |    12    13    45 |     8    15    34 |
igr | igr 2975 |  ----  ----  ---- |  ----  ----  ---- |  ----  ----  ---- |
igs | igs 2975 |  ----  ----  ---- |  ----  ----  ---- |  ----  ----  ---- |
jpl | jpl 2880 |    14    13    32 |    15    17    40 |    14    18    52 |
mit | mit 2976 |  ----  ----  ---- |  ----  ----  ---- |  ----  ----  ---- |

Table 5.1997.4   GPS week: 1997   Day: 4   MJD: 58227.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3066 |     8     7    29 |     9    10    41 |     8    10    40 |
emr | emr 2971 |    13    14    33 |    14    19    48 |    16    16    64 |
esa | esa 2976 |     9     9    31 |     9    11    42 |     8     8    40 |
gfz | gfz 2974 |     9     7    30 |     9     8    40 |     8    10    39 |
grg | grg 2976 |    11     9    33 |    11    12    46 |     8    13    49 |
igr | igr 2976 |     9     8    29 |     9    10    43 |     8     9    41 |
igs | igs 2976 |     9     8    27 |    10    10    44 |     8    11    43 |
jpl | jpl 2976 |    14    15    35 |    12    14    43 |    13    16    54 |
mit | mit 2976 |    11     9    24 |    11    10    42 |     9    10    45 |

Table 5.1997.5   GPS week: 1997   Day: 5   MJD: 58228.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3069 |     8     9    22 |    11    11    36 |     8    10    42 |
emr | emr 2976 |    13    16    27 |    16    15    52 |    12    16    51 |
esa | esa 2976 |     8    12    24 |    10     9    37 |     8     9    39 |
gfz | gfz 2976 |    10     9    24 |    11     9    39 |     7     9    39 |
grg | grg 2976 |    11    10    22 |    12    13    44 |     7    13    49 |
igr | igr 2976 |     9     9    21 |    11     9    38 |     7     9    40 |
igs | igs 2976 |     9    10    21 |    11     9    39 |     7    10    40 |
jpl | jpl 2976 |    12    17    26 |    13    14    39 |    12    14    47 |
mit | mit 2976 |    14    13    30 |    14     9    42 |   126    36   138 |

Table 5.1997.6   GPS week: 1997   Day: 6   MJD: 58229.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3069 |     8     6    29 |     8     8    38 |     9    11    36 |
emr | emr 2976 |    12    11    30 |    13    16    41 |    16    18    48 |
esa | esa 2976 |    10     8    33 |     8    10    37 |     9    10    39 |
gfz | gfz 2976 |     9     7    35 |     7     9    41 |     9    12    33 |
grg | grg 2976 |    11    11    36 |    10    11    46 |    10    14    40 |
igr | igr 2976 |     9     6    32 |     8     8    38 |     8    10    34 |
igs | igs 2976 |     9     7    32 |     8     9    40 |    10    12    38 |
jpl | jpl 2976 |    14    14    39 |    10    13    40 |    12    19    44 |
mit | mit 2976 |    11     8    29 |    12    14    43 |    67    18    77 |


Table 6: Earth Orientation Parameters weekly summary.                          
                                                                              
        Weekly mean and standard deviation of Centre ERP, ERP rates and       
        LOD differences with respect to IGS combined values. See Table 7 for  
        the daily summaries.                                                  
                                                                              
        Xpole,Xrt: x pole and x pole rate                          
        Ypole,Yrt: y pole and y pole rate                       
        LOD      : Length Of Day                                               
                                                                              
        AC LOD BIAS    : 10-day mean LOD bias with respect to Bulletin A     
        AC LOD BIAS RMS: RMS of AC LOD BIAS                              
                                                                              
        FLAG: "u" (used), "x" (excluded), "-" (no submission)                 
              for Xpole, Ypole, Xrt, Yrt and LOD                              

Table 6.1997   GPS week: 1997   MJD: 58223.500-58229.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |     -14     -18      91     -13      3 |      18     20
            |       7      18      56     140      4 |       2
emr   uuuuu |       9       9     -67     -60     17 |      13     22
            |      35      26     112     143     17 |       6
esa   uuuuu |       2       9      20      37     -5 |      22     24
            |      17      12      35      53      2 |       2
gfz   uuuuu |      11      26    -147     141     -3 |      21     23
            |       8      17     134     106      4 |       1
grg   uuuuu |      -1       4     -64    -209     -4 |       0     10
            |      21      11      51      56      3 |       2
igr   xxxxx |     -13      -7      30     -39     -4 |       1      9
            |      18      13      47      31      3 |       2
irf   xxxxx |     -13     -15     -25       7      4 |      -2      9
            |       9      16      34      40      7 |       2
jpl   xxxxx |       5       0     -95       1    -11 |      28     32
            |      30      34      43      50     18 |       6
mit   uuuuu |     -19     -19       3      53      5 |      22     24
            |      32      27      92     102      9 |       2
ngs   uuuuu |      -7     -14     130     -38      1 |      13     16
            |      28      26     188      97      7 |       2
sio   uuuux |      30      18     -19      98      1 |      87     88
            |      23      29     112      90      9 |       1


Table 7.1997.0   GPS week: 1997   Day: 0   MJD: 58223.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |     -20      -8      47      42     -1 |      20     22
emr   uuuuu |      20      33    -202     -53     15 |       9     18
esa   uuuuu |      15      -1     -29     -48     -3 |      25     26
gfz   uuuuu |      12      20     -42      48     -5 |      24     26
grg   uuuuu |      23      -7       2    -247     -4 |       3     10
igr   xxxxx |     -25     -27      27       9     -1 |       5     11
irf   xxxxx |     -20     -36      25      25     -8 |       0     12
jpl   xxxxx |     -15      -2     -66     -40    -31 |      38     40
mit   uuuuu |     -48     -43     150     125    -11 |      25     28
ngs   uuuuu |      -6       5     -25      -1      7 |      13     17
sio   uuuux |      13      10      94     188    -11 |      88     89

Table 7.1997.1   GPS week: 1997   Day: 1   MJD: 58224.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |      -5       8      -9     215     -3 |      19     21
emr   uuuuu |       7       4    -176     -58     25 |       9     17
esa   uuuuu |     -27      20      11      24     -8 |      23     25
gfz   uuuuu |       3      11    -100     159     -5 |      22     22
grg   uuuuu |      10      -3     -34    -230     -5 |       2      9
igr   xxxxx |     -27     -15     -42     -72     -9 |       3      8
irf   xxxxx |     -27     -37       2     -44     -1 |      -2      8
jpl   xxxxx |     -47     -54     -42     -67    -16 |      34     37
mit   uuuuu |     -44     -36      66     -26     -4 |      22     24
ngs   uuuuu |      30       5     157     -94      4 |      12     16
sio   uuuux |      16     -23      46      38     -3 |      87     87

Table 7.1997.2   GPS week: 1997   Day: 2   MJD: 58225.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |     -18     -19     118    -180      7 |      16     17
emr   uuuuu |     -60      55     121    -357    -11 |      10     19
esa   uuuuu |      18      13       6      55     -4 |      21     23
gfz   uuuuu |      27      33    -392     226      5 |      20     21
grg   uuuuu |     -15      22    -108    -184     -6 |       0      9
igr   xxxxx |     -31      -3       2     -14      0 |       1      8
irf   xxxxx |      -1     -10     -43      26     11 |      -5      8
jpl   xxxxx |       2      28     -86      35    -19 |      31     34
mit   uuuuu |      13     -52     -30     173     11 |      20     21
ngs   uuuuu |     -29      -9     331     -45     12 |      11     15
sio   uuuux |      57     -12       2     206      7 |      86     87

Table 7.1997.3   GPS week: 1997   Day: 3   MJD: 58226.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |     -16      -8      85      55      2 |      16     18
emr   uuuuu |      34       1    -120     -64     40 |       8     18
esa   uuuuu |      -2      30      10      51     -8 |      22     23
gfz   uuuuu |      11      47    -261     330      0 |      21     22
grg   uuuuu |     -38      -3    -119    -297     -9 |       0      9
igr   xxxxx |     -18      13      85     -32     -6 |       1      8
irf   xxxxx |      -6      -8     -72      32      5 |      -4      8
jpl   xxxxx |      26     -21    -146     -36    -23 |      28     32
mit   uuuuu |      26     -21    -134      73      6 |      21     22
ngs   uuuuu |     -34     -49     387    -223     -5 |      13     16
sio   uuuux |      68      38     -84     141     -9 |      88     88

Table 7.1997.4   GPS week: 1997   Day: 4   MJD: 58227.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |     -18     -17     143     -10      3 |      18     19
emr   uuuuu |      48     -15     -59     104     32 |      12     24
esa   uuuuu |       0      -1      80     -12     -8 |      21     23
gfz   uuuuu |      10      47    -144      51     -3 |      21     22
grg   uuuuu |       9      -4    -123    -214     -5 |      -2      9
igr   xxxxx |       8       0      92     -43     -2 |       0      8
irf   xxxxx |     -15       3     -55       8     10 |      -3      8
jpl   xxxxx |      43      14    -160      12     -2 |      23     27
mit   uuuuu |      -9      13     -61      31     14 |      21     22
ngs   uuuuu |     -33     -47     176      -3     -4 |      12     16
sio   uuuux |      19      33    -113      81      7 |      86     87

Table 7.1997.5   GPS week: 1997   Day: 5   MJD: 58228.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |     -20     -42     101    -185      8 |      18     19
emr   uuuuu |      16       1     -40      -4     12 |      17     27
esa   uuuuu |     -10       0      52      96     -5 |      20     22
gfz   uuuuu |       1       8     -34      61     -7 |      20     21
grg   uuuuu |     -12      10     -35    -166     -1 |      -3     10
igr   xxxxx |     -11     -13      31     -43     -4 |      -1      8
irf   xxxxx |      -8      -3      -8      55      7 |      -3      8
jpl   xxxxx |      -4      49     -98      76     -7 |      21     25
mit   uuuuu |     -13      15      42     117     10 |      22     23
ngs   uuuuu |      29     -19       5      34     -3 |      13     16
sio   uuuux |       8      61    -190      83      4 |      87     87

Table 7.1997.6   GPS week: 1997   Day: 6   MJD: 58229.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   uuuuu |      -4     -39     150     -31      3 |      22     25
emr   uuuuu |       0     -16       8      11      7 |      23     32
esa   uuuuu |      17       3      12      91     -3 |      22     25
gfz   uuuuu |      12      13     -55     113     -5 |      22     24
grg   uuuuu |      14      15     -29    -127      0 |       1     11
igr   xxxxx |      16      -5      16     -78     -3 |       1     11
irf   xxxxx |     -13     -13     -23     -51      2 |       2     12
jpl   xxxxx |      28     -16     -71      24     22 |      23     28
mit   uuuuu |     -56     -10     -12    -125      7 |      26     29
ngs   uuuuu |      -6      16    -122      65     -2 |      16     19
sio   uuuux |      29      17     108     -52     16 |      90     90


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