[IGSREPORT-25784] Wk 1988 IGS Final Orbits

acc acc at igs.org
Sat Mar 3 05:36:44 PST 2018


Author:  AC Coordinator / GA MIT 

sum-file Version 2.0
Final IGS Orbit Combination - Week 1988   (Feb 11, 2018 - Feb 17, 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:

igs1988[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1988[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1988[0-6].cls  IGS GPS clock combination summary report.
igs19887.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs19887.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   | 12 12 TIXI TIXI
                0  |  ESA   | FAA1 KOUR FAA1 KOUR
                0  |  GFZ   | BJNM BJNM
                0  |  GRG   | 5 5 GLSV MAL2 GLSV MAL2 TONG
                0  |  MIT   | MAG0 MAG0
                1  |  COD   | BJNM OHI2 TIXI BJNM OHI2 TIXI
                1  |  EMR   | 24 14 24 27 TLSE TLSE
                1  |  ESA   | SAVO FAA1 SAVO
                1  |  GFZ   | 24 24 FAA1
                1  |  GRG   | GLSV TLSE GLSV TLSE
                1  |  MIT   | 30 30
                2  |  COD   | MAL2 OHI2 TIXI BJCO LHAZ MAL2 OHI2 TIXI
                2  |  ESA   | LHAZ SAVO LHAZ SAVO
                2  |  GFZ   | KOUR MAL2 KOUR MAL2 NICO
                2  |  GRG   | GLSV NICO ALRT GLSV NICO
                3  |  COD   | MAL2 TIXI MAL2 OHI2 TIXI
                3  |  ESA   | LMMF MAL2 MAL2
                3  |  GFZ   | ALRT
                3  |  GRG   | GLSV LPGS GLSV LPGS
                4  |  COD   | TIXI OHI2 TIXI
                4  |  EMR   | LPGS LPGS SYOG
                4  |  ESA   | KOUR FAA1 KOUR
                4  |  GFZ   | 25 BJNM ALRT BJNM
                4  |  GRG   | GLSV MAW1 NRIL RIO2 SYOG FAA1 GLSV MAW1 NRIL RIO2
                4  |  GRG   | SYOG
                5  |  COD   | TIXI OHI2 TIXI
                5  |  EMR   | MCM4
                5  |  ESA   | FAA1 FAA1 WIND
                5  |  GFZ   | BJNM FAA1 IRKJ FAA1 IRKJ
                5  |  GRG   | ADIS DGAR GLSV ADIS DARW DGAR GLSV STK2
                6  |  COD   | GLSV TIXI GLSV KRGG OHI2 TIXI
                6  |  ESA   | FAA1 FAA1 ONSA
                6  |  GFZ   | FAA1 MAL2 FAA1 GODE
                6  |  GRG   | ADIS BRST BRUX GLSV MAL2 ADIS BRST BRUX DAV1 GLSV
                6  |  MIT   | AREG AREG

 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. The following table lists all maneuvered satellites for this week. The
    solutions from COD and ESA, which modeled the maneuver, are used that day for
    combination, if available. An associated accuracy code of 0 (unknown) is given
    if only one AC is left (no redundancy). For the long arc evaluation the arc is
    split into two parts at the given maneuver epoch.
    
               PRN |    Date    | Ref. NANU
               ----+------------+----------
               G30 | 2018_02_13 | 2018005 
               G30 | 2018_02_14 | 2018005 

 7. The following orbit solutions were excluded from the combination because they
    were biasing the weighted average (generally indicated by long arc RMS). They
    were still used for statistics computation.
    
               Day | Centre | PRN list
               ----+--------+---------------
                3  |  GRG   |  10

 8. 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 G06 |    |    |    |    |    |    |  4 |

 9. 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.

10. 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 |     .4     .2     .5       2      0      4    -.10
       EMR  |   0 |    6.2   -3.2    7.9     -15     16     17     .20
       ESA  |   0 |    -.6     .6    -.3     -16     28     21    -.19
       GFZ  |   0 |    -.4     .1     .2      -4    -21     11    -.06
       GRG  |   0 |    -.5    2.1    3.0      50     18     17    -.26
       JPL  |   0 |    5.4    6.8    2.9      31      4     38     .49
       MIT  |   0 |    3.4   -4.2    6.4     -17     41      4     .05
       NGS  |   0 |   -4.9   -6.1   11.6     -66    -52    -36     .05
       SIO  |   0 |    1.0    -.1   -3.2       8     14     10    -.05

       COD  |   1 |     .3     .2     .5       3      9     -1    -.26
       EMR  |   1 |    7.4   -4.2   10.6     -11     -8      0     .18
       ESA  |   1 |    -.0     .3     .5     -16     -3     36    -.07
       GFZ  |   1 |    -.4    -.1     .0      -8    -22     15     .01
       GRG  |   1 |    1.3   -3.7    3.4      83    -20     23     .14
       JPL  |   1 |    8.6    4.6    3.6      61    -45     91     .51
       MIT  |   1 |    3.9   -5.4    3.6     -14     26      8     .30
       NGS  |   1 |    -.0   -6.4    9.3     -41    -53    -27     .22
       SIO  |   1 |     .6   -2.8   -9.7      -8     -2     17     .15

       COD  |   2 |    -.1     .0     .1       0      7      5    -.19
       EMR  |   2 |     .5   -7.0    7.5      -6     13    -18     .08
       ESA  |   2 |     .4     .8    1.6     -15     42     16    -.32
       GFZ  |   2 |    -.5     .2     .4      -1     -9      9    -.17
       GRG  |   2 |    1.5   -2.6   17.0      73    -18     41     .30
       JPL  |   2 |    4.6    5.1    4.0      18     24    125     .69
       MIT  |   2 |    1.2   -4.4    4.2     -17     41     -6     .23
       NGS  |   2 |    1.5   -6.9    6.0     -36    -55    -12     .17
       SIO  |   2 |   -1.3   -1.5  -12.3       4     16     17     .43

       COD  |   3 |    -.3     .2     .2      11     17     -7    -.11
       EMR  |   3 |    7.3   -6.4     .8       0      1     22     .19
       ESA  |   3 |    -.0     .7    1.0      -4      7      9    -.14
       GFZ  |   3 |    -.4     .2    -.1     -13    -15      1    -.11
       GRG  |   3 |    7.8    1.9   10.1      57     17     15    -.19
       JPL  |   3 |    2.5     .4    4.8      30    -29     34     .46
       MIT  |   3 |    2.0   -4.8    5.5       0     34      8     .03
       NGS  |   3 |    9.8   -9.3   -2.9      -2    -14     -6     .06
       SIO  |   3 |    2.3   -3.1  -10.9       7      8     -3     .17

       COD  |   4 |    -.4     .4    -.0       7     10      0    -.03
       EMR  |   4 |   11.1    -.0    4.4     -17      0     13     .23
       ESA  |   4 |    -.0    1.1     .6     -11      8     -2     .07
       GFZ  |   4 |    -.3     .2    -.4     -10    -21     13     .04
       GRG  |   4 |    5.1    6.9    4.8      80     -2     45     .05
       JPL  |   4 |   10.0    5.1    -.7      40    -67     83     .66
       MIT  |   4 |    3.5    -.5    8.5      -1     29      1     .29
       NGS  |   4 |    4.9    -.9     .7       6    -19      6     .08
       SIO  |   4 |    2.0    7.1   -9.5      15      4      1     .31

       COD  |   5 |    -.3    -.0    -.1       3      9     -5     .06
       EMR  |   5 |   11.5   -1.5    7.9     -24     -5     27     .37
       ESA  |   5 |    -.0    1.3     .8     -17      8     19     .02
       GFZ  |   5 |    -.5     .1    -.3     -14    -11      5     .10
       GRG  |   5 |    8.8   -3.4    4.0      75    -37     75     .22
       JPL  |   5 |    7.4    5.9    5.8      -2    -40     39     .55
       MIT  |   5 |    6.1   -3.3    7.2     -15     23     15     .25
       NGS  |   5 |    8.1   -8.5    2.4     -28    -43    -17     .14
       SIO  |   5 |    6.2    3.7   -4.2      -8      8     10     .17

       COD  |   6 |    -.3     .0     .1      -1     15      0     .04
       EMR  |   6 |    2.1   -1.4   10.9     -13      2      8     .39
       ESA  |   6 |     .3     .7     .7     -26     17     13     .06
       GFZ  |   6 |    -.1     .3    -.2     -13    -24      6     .08
       GRG  |   6 |    1.2   -4.2    7.9      41    -22     79     .26
       JPL  |   6 |    3.4    3.2    5.9       5    -32     37     .49
       MIT  |   6 |    3.2   -1.5   10.0      -2     36      5     .30
       NGS  |   6 |    5.1   -2.9    3.1     -11    -20      1     .18
       SIO  |   6 |     .1   -1.3   -2.8       7     10     20     .27


11. 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.

12. 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 1.1988.a). It also displays the computed satellite
position sigmas for the combined orbits (Table 1.1988.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 2.1988.[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 3.1988.[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 5.1988.0-6). 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 1988 summary.                       (Feb 11, 2018 - Feb 17, 2018)

Table 1.1988.a   GPS week: 1988   MJD: 58160.000-58166.000

         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|   -1     0     1     0     0     0  -.05    9    9 |    -336    -300     11    113
        |    0     0     0    26    19    11   .03           |     180     289
emr   79|    1     0     3     5    -8    -2   .25   14   14 |  137920      29     19    146
        |    0     1     1    11    17    24   .02           |     774     618
esa  150|    0     0     0   -17    -4     3  -.03   11   11 |    -186   -1542      8    202
        |    0     0     0    15    15    12   .02           |     800    1310
gfz  187|    0     0    -4    -9   -25     6   .09   11   10 |    -132     -95     12    148
        |    0     0     1    17    33    12   .03           |     327     491
grg  107|    1     0     2    -9     3    29  -.39   15   12 |   24501  -64917     14    215
        |    0     0     5    14    24    40   .03           |   63650  168322
igr  n/a|    0     0    -1    -4   -10   -10  -.00    5    5 |   44858     755     12     80
        |    0     0     0    12    24    13   .02           |   34621    1912
jpl   80|    0     0     4    13    11    31   .23   12   13 |  139444     282     41    206
        |    0     0     1    16    20    11   .03           |     515     676
mit  349|    0     0    -2     8    12   -13   .01   12   10 |      85     -91     42    331
        |    1     0     1    28    49    10   .02           |     142     213
ngs  208|    0     0     0     5     5    -9   .07    9    8 |    -361    -332    947   2136
        |    0     0     3    17    19     9   .03           |     182     401
sio  343|    0     0     0    12    12     0   .04   13   12 |     ---     ---    ---    ---
        |    0     0     1    26    53    27   .04           |     ---     ---


Table 1.1988.b   GPS week : 1988   MJD: 58160.000-58166.000   

         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  |    3    3    3    3    3    3    3 |
   2  |    5    5    5    5    5    5    5 |
   3  |    3    4    4    4    4    4    4 |
   4  |    0    0    0    0    0    0    0 |
   5  |    4    5    5    5    5    5    5 |
   6  |    3    3    4    3    4    4    4 |
   7  |    5    4    5    5    4    5    5 |
   8  |    3    3    3    3    3    3    3 |
   9  |    4    4    4    4    5    4    4 |
  10  |    4    4    4    4    4    4    4 |
  11  |    4    4    4    4    4    4    4 |
  12  |    4    4    5    4    5    5    5 |
  13  |    5    5    5    4    5    5    5 |
  14  |    5    5    5    6    5    6    5 |
  15  |    5    5    5    5    5    5    4 |
  16  |    6    6    5    5    4    5    5 |
  17  |    4    5    5    4    5    5    5 |
  19  |    5    5    6    5    5    5    5 |
  20  |    4    4    4    4    5    4    6 |
  21  |    5    4    4    5    5    5    5 |
  22  |    4    4    3    4    4    4    4 |
  23  |    6    6    5    6    6    6    6 |
  24  |    4    4    4    4    4    4    4 |
  25  |    4    5    5    5    6    4    4 |
  26  |    5    4    5    5    4    5    5 |
  27  |    4    3    3    3    3    3    3 |
  28  |    4    4    6    5    4    5    4 |
  29  |    5    5    5    5    5    5    5 |
  30  |    3    4    9    5    3    3    3 |
  31  |    5    4    4    5    5    4    5 |
  32  |    4    4    4    4    4    4    3 |



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 2.1988.0   GPS week: 1988   Day: 0   MJD: 58160.000                            

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  268|   -2     0     1    14   -27   -13   .01    9    9 |    -351    -270     11    108
emr   79|    0     0     3     6   -12    16   .27   13   13 |  137808    1023     18    154
esa  150|    0     0     0     1     4     9   .01   10   11 |    -271   -2147      9    208
gfz  187|    0     0    -5    -9   -30    17   .05   11   10 |     -84    -269     10    118
grg  100|    0     0    -6   -20     1   -28  -.35   13   12 |    1148   -4084     14    224
igr  n/a|    0     0    -1     3   -34   -15   .01    5    5 |   67033    4163     12     68
jpl   80|    0     0     2    24    11    27   .28   12   12 |  139659    1096     40    223
mit  350|    2     0    -2     7    44     5  -.02   12   10 |     -20     -36     53    337
ngs  210|   -1     0     5   -13   -20     1   .02    9    8 |    -369    -277    813   2128
sio  353|    0     0    -2     6    56    14   .02   12   12 |     ---     ---    ---    ---

Table 2.1988.1   GPS week: 1988   Day: 1   MJD: 58161.000                            

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  272|   -3     0     1     8    28    -8  -.03    9    8 |    -409    -321     11    100
emr   80|    2     0     3    18     9   -50   .22   13   13 |  138771    -464     23    122
esa  150|    0     0     1   -47   -19    20  -.03   11   11 |    -970     119     10    214
gfz  192|    1     0    -3   -22   -16    14   .12   11   10 |     168    -293     12    125
grg  111|    0     0    -3     0    10     8  -.36   13   12 |     116    -103     16    195
igr  n/a|    0     0     0    -5     0   -15   .02    4    4 |   71160    2182     12     73
jpl   80|    1     0     2    30    15    25   .23   13   14 |  140311    -354     42    204
mit  349|    1    -1    -4    21   -27    -2  -.01   12   10 |     145     -85     44    353
ngs  212|    0     0     2     3    19   -16   .07    9    8 |    -101   -1045    731   2083
sio  349|    0     0     0    10   -37    40  -.03   13   12 |     ---     ---    ---    ---

Table 2.1988.2   GPS week: 1988   Day: 2   MJD: 58162.000                            

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  268|   -2     0     0     2    -4     4  -.06    9    8 |    -237    -483     11    123
emr   80|    1     0     1   -12   -35    18   .27   16   16 |  138388      33     18    169
esa  150|    0     0     0   -18    -3    -7  -.02   11   11 |    -263    -790      8    225
gfz  188|    0     0    -7   -16   -44    11   .10   11   10 |    -418     206     13    151
grg  109|    0     0     7   -19   -27    13  -.38   15   12 |     -39      78     15    252
igr  n/a|    0     0    -3     4   -30   -17   .02    5    4 |    9650    -309     15     88
jpl   80|    1     0     2    25    14    24   .25   12   12 |  139708     145     40    206
mit  350|    0     0    -3     4    36   -21   .02   11    9 |     -77     -57     37    310
ngs  209|    1     0     0    27    17   -10   .05   10    9 |    -367    -378    597   2421
sio  348|    1     0     0    17    35    11   .05   13   12 |     ---     ---    ---    ---

Table 2.1988.3   GPS week: 1988   Day: 3   MJD: 58163.000                            

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|   -1     0     2   -12    10    -3  -.08    8    8 |    -127    -582     10     96
emr   80|    0     0     2    -8    -1     8   .26   14   14 |  138659    -525     21    171
esa  150|    1     0     1   -21     1   -10  -.06   11   11 |    1177   -3845     11    223
gfz  187|    0     0    -4   -25    -2    14   .10   11    9 |     391    -909     12    137
grg  106|    2     0     3   -29    35    39  -.36   19   12 |     271    -339     14    208
igr  n/a|    0     0    -1   -29    17    16  -.02    4    4 |   75785     960     13     89
jpl   80|    0     0     4    17    41    31   .21   12   12 |  139450    -460     42    191
mit  350|    0    -1    -1    44   -29   -15   .00   11   10 |     163    -334     36    334
ngs  209|    0     0    -4     9    11   -20   .08   10    9 |    -292    -304    889   2237
sio  343|    0     0     1    34   -40    13   .05   12   12 |     ---     ---    ---    ---

Table 2.1988.4   GPS week: 1988   Day: 4   MJD: 58164.000                            

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|   -1    -1     0    41     8     5  -.06   10   10 |    -364    -323     15    119
emr   80|    1    -1     4    12   -21     9   .27   14   14 |  138012    -588     20    137
esa  150|    1    -1     0    -6   -29    -6  -.04   11   11 |    -690    -899      8    193
gfz  186|    0     0    -2    24   -82   -14   .08   12   12 |    -250      69     15    141
grg  110|    1     0     3    13    14    57  -.40   12   11 |     -38     230     14    210
igr  n/a|    0     0     0    -9   -35   -24  -.01    5    5 |    8444   -1418     11     74
jpl   80|    1     0     4    14     7    41   .27   13   13 |  139157    -143     43    200
mit  350|   -1     0    -1   -48    83   -16   .02   12   11 |     -26       0     40    279
ngs  203|   -1     1    -1    -8   -20    -1   .10    9    8 |    -497    -128   1087   1884
sio  339|    0     0     1   -40    70   -29   .08   15   14 |     ---     ---    ---    ---

Table 2.1988.5   GPS week: 1988   Day: 5   MJD: 58165.000                            

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|   -2    -1     1   -23     3    -3  -.06    9    9 |    -675     309     13    116
emr   80|    1     1     4     7    14     0   .22   14   14 |  136819     637     20    130
esa  150|    0     0     0   -17    17    19  -.05   11   11 |    -886    -950      8    187
gfz  185|    0     1    -4     2    23    -5   .13   10    9 |    -557     676     11    210
grg  108|    1    -1     1    -1    19   100  -.42   14   14 |    1207   -3586     14    215
igr  n/a|    0     0    -1     2    22    -3  -.01    5    5 |   76014     482     13     83
jpl   80|    0     1     5    -7    21    53   .18   13   13 |  138709    1228     42    201
mit  350|    0     0    -1    24   -53   -23   .03   12   11 |     334     252     44    369
ngs  210|    0     1    -1    -6    27   -18   .09    9    8 |    -668     291   1620   2193
sio  332|    1     0     0    18   -53   -22  -.01   12   11 |     ---     ---    ---    ---

Table 2.1988.6   GPS week: 1988   Day: 6   MJD: 58166.000                            

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  259|   -1     0     0   -38   -21    21  -.10    8    8 |    -191    -436     12    132
emr   78|    0     0     6    15   -12   -16   .27   14   14 |  136986      93     19    141
esa  150|    0     0     0   -13    -1     0  -.03   10   10 |     599   -2286      6    169
gfz  185|    0     1    -5   -17   -25    10   .05   11    9 |    -174    -150     11    154
grg  110|    1     0     8    -5   -28    17  -.44   18   15 |  168843 -446615     13    203
igr  n/a|    0     0    -1     0   -11   -13  -.01    4    4 |    5925    -773     12     85
jpl   80|    0     0     5    -9   -28    17   .21   12   13 |  139117     467     39    222
mit  350|    0    -1    -1     4    33   -18   .04   12   10 |      77    -383     46    335
ngs  208|    0     0    -1    29     6     2   .06    9    8 |    -237    -486    895   2012
sio  338|    0     0    -3    41    54   -29   .09   12   11 |     ---     ---    ---    ---

       
       
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 3.1988.0   GPS week: 1988   Day: 0   MJD: 58160.000                            

        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   12    7    7    8    4   13    9    6   10    3 |    22   28   22   20   20   21   28   24   22   28    22
   2  |    7   15    9   14   19    5    9   17   11   13    5 |    24   27   28   34   22   27   27   32   29   30    26
  X3E |    7   10    8    7  ---    5   11    6    6    7    3 |    32   36   34   33  ---   34   36   36   37   38    34
  X4E |    2  ---  ---  ---  ---   17  ---  ---  ---  ---    0 |    57  ---  ---  ---  ---   60  ---  ---  ---  ---    57
   5E |    6   12   10    9   19    3   14   10    9   16    4 |    27   29   24   29   27   27   28   31   32   36    28
   6  |    7   10    7   10   10    5    9    9    5    9    3 |    22   27   24   21   22   21   28   23   23   27    22
   7  |    9   11   12   13    9    4   14   13    9   17    4 |    47   48   48   46   44   46   49   45   48   46    46
   8  |    8   12    5    6    7    3   10    9    6    8    3 |    32   39   34   34   34   33   38   33   35   35    34
   9  |    8    7   12   12    8    6   12   10    8   13    3 |    40   45   43   40   37   40   46   40   41   44    40
  10E |    9   12    8    8   18    6   10    9    8    8    4 |    39   40   40   40   45   39   40   41   40   41    39
  11  |    4   13   16    9    9    5   14    8    7   12    3 |    37   46   32   40   41   38   47   38   39   40    38
  12E |    8   14    7   10   19    4   18   11   10    8    4 |    56   58   53   55   52   54   59   57   57   58    55
  13  |    9   12   11   10    9    3   10   18   11   20    4 |    18   27   20   22   16   19   27   25   20   26    18
  14  |   11    9   13   16    8    5   10   11   12   17    4 |    28   29   26   41   29   33   29   36   32   37    30
 X15  |    9   13   13   12  ---    4   14   17   11   14    5 |    59   66   61   54  ---   57   67   53   59   64    58
  16E |   16   18    8   15   23    7   14   16   12   10    5 |    58   59   58   60   63   59   61   53   56   54    57
  17  |    9   10   10   13   14    5   10   13    8   12    4 |    27   33   30   27   25   26   34   28   27   27    26
  19  |   10   18   12   14   12    6   11   16   11   15    5 |    28   29   34   36   23   31   31   35   33   32    30
  20E |    7   12    8    8   17    4   11   11    6    8    3 |    54   52   52   54   59   53   49   53   51   53    53
 X21  |   11    9   12    9  ---    4   16   12    8   15    4 |    28   28   25   28  ---   26   32   28   30   23    25
  22E |    8   11    9    8    8    4   11   10    7   10    3 |    26   28   30   26   32   27   28   27   27   28    27
  23  |    8   21   14   17   13    8   12   25   10   19    6 |    24   24   21   33   20   27   25   35   30   32    24
  24  |    8    9   12    9   10    3    9    9   10   10    3 |    19   25   21   22   18   19   28   20   25   26    20
  25E |    9   12   12   10   14    6   11   12    4    9    4 |    37   37   40   36   29   35   35   33   32   31    33
  26E |    6   15   10   11   22    4   10   11    9    9    4 |    29   32   33   32   32   30   31   29   28   29    29
  27  |    9   11    9   10    5    5   11    8    6   12    3 |    31   36   32   35   31   34   37   32   30   32    31
  28E |    6   12    7   12   17    4   10   14    7    8    4 |    69   72   70   70   76   70   74   75   68   70    70
  29  |   12   19   10   12   12    5   16   12   11   13    4 |    37   31   33   34   31   34   37   32   36   33    33
  30  |    5    7   10    5    9    4   10   10    6   11    3 |    26   27   28   22    9   27   29   26   22   16    28
  31  |   15   14   14   11   10    4   11   13   11   14    5 |    42   46   43   42   42   41   47   42   43   41    41
  32  |    9   10   13    7    8    3   10    8    9    8    3 |    26   32   27   27   24   26   33   23   26   27    25
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   13   10   11   13    5   12   12    9   12      |T   35   37   35   36   33   35   38   36   35   36    35
 WRMS |    9   13   11   10   12    5   12   10    8   12      |NE  30   34   31   33   29   31   36   31   32   33    30
 MEDI |    8   12   10   10   10    4   11   11    8   11      |MD  31   32   32   34   31   33   34   33   32   32    31

Table 3.1988.1   GPS week: 1988   Day: 1   MJD: 58161.000                            

        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   12    8    7    8    3   15    5    9   10    3 |    29   31   29   28   27   28   33   28   30   32    28
   2  |   10   15   10   16   18    5   10   14   10   14    5 |    23   29   26   32   23   26   28   29   29   28    25
   3E |    8    9    9    7   18    3   10    6    6    8    3 |    28   30   29   26   22   27   30   29   29   31    27
  X4E |    2  ---  ---  ---  ---   27  ---  ---  ---  ---    0 |    28  ---  ---  ---  ---   23  ---  ---  ---  ---    28
   5E |   10   12    8   11   19    5   15   11    8   14    4 |    33   32   30   37   33   31   30   34   35   32    32
   6  |    6    9    5    8   12    4    9    7    4    7    2 |    25   32   27   28   29   26   31   27   26   24    26
   7  |    7   14   15   10    8    4   10   12    8   13    4 |    41   43   38   42   37   40   42   43   45   40    40
   8  |    7   13    8    7    9    3   14    6    7    9    3 |    30   36   31   32   31   30   36   30   33   31    31
   9  |    7    8   13    9    8    3    9    7    8   12    3 |    40   45   41   39   40   40   44   42   41   43    40
  10E |    9   13   10    9   16    4   11    7    8    6    3 |    29   33   32   31   29   29   31   30   31   30    29
  11  |    5   11   16    8   10    3   14    5    7   11    3 |    32   37   27   33   31   30   39   30   33   31    30
  12E |    9   15    8   10   16    3   19   10    9   11    4 |    29   28   26   28   30   25   28   25   29   27    27
  13  |    6   14   11    9   10    6   15   17    9   17    4 |    23   32   23   25   24   24   32   32   27   30    24
  14  |   10    9   12   16    5    3   11   12   10   19    4 |    32   34   32   42   29   35   32   37   33   40    33
  15  |    7   14   12   11   12    3   15   18   12   14    4 |    49   49   48   49   56   47   53   46   49   48    47
  16E |   18   17    9   15   26    7   14   13   14   12    6 |    24   26   26   31   32   26   28   28   27   28    25
  17  |   10   16   10   14   14    6   13   13   10   12    4 |    29   36   28   29   29   28   35   31   32   30    28
  19  |    7   23   10   14   13    5   14   14   13   15    5 |    20   26   22   25   22   23   27   27   28   22    21
  20E |    7   13    9    9   11    3   14   14    8    8    3 |    70   70   69   70   73   70   72   67   70   68    69
  21  |   10    9    9    8   10    5   27   12    9   12    3 |    34   34   31   33   15   32   37   31   30   27    30
  22E |   11   10    8    8   15    3   12    7    8   10    3 |    41   42   39   38   41   38   41   37   39   40    38
  23  |   10   21   13   14   14    8   11   21   14   20    6 |    31   34   29   31   26   29   32   33   32   31    28
  24  |    7   10   14   10    9    4   11   11    9   12    4 |    26   33   31   29   27   27   34   25   30   31    27
  25E |    9   10   14   13   11    5   12   15    4   16    4 |    46   49   49   50   43   46   50   44   44   39    45
  26E |    9   13   11   10   14    5    9   16    6   10    4 |    35   36   35   35   32   34   35   38   32   32    32
  27  |    7   10    8    7   10    3   11    6    5   11    3 |    22   26   23   24   22   23   26   22   24   27    22
  28E |   10   12    8    9   14    6   13    9    9    9    3 |    46   45   46   44   46   44   42   50   47   50    46
  29  |   10   19   12   12    8    5   16   15    9   14    4 |    25   24   22   26   18   22   23   24   22   19    21
 X30  |    8    9   11    7  ---    3    9   10    3  ---    3 |    22   27   22   22  ---   22   29   28   23  ---    22
  31  |    9   13   13    9   10    3   14   11    9   15    4 |    27   31   24   27   18   25   31   27   28   23    24
  32  |    7   10   13    7    6    2    9    9   10   11    3 |    21   30   23   22   18   21   28   21   23   22    20
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   13   11   11   13    4   13   12    9   13      |T   31   35   31   33   31   31   35   33   33   32    31
 WRMS |    8   13   11   10   12    4   14   10    8   12      |NE  29   34   29   31   27   29   34   30   31   31    29
 MEDI |    8   12   10    9   11    4   12   11    9   12      |MD  29   33   29   31   29   28   32   30   30   31    28

Table 3.1988.2   GPS week: 1988   Day: 2   MJD: 58162.000                            

        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   15    8    8    9    4   12    5    7   11    3 |    19   24   18   20   17   19   24   20   20   26    19
   2  |    8   16    9   14   15    5   12   17   12   13    5 |    17   22   19   24   17   20   20   25   24   25    19
   3E |    4   14   11   11   24    4    9    6    6    8    4 |    23   24   27   25   23   24   23   25   28   28    23
  X4E |    1  ---  ---  ---  ---   25  ---  ---  ---  ---    0 |    36  ---  ---  ---  ---   39  ---  ---  ---  ---    36
   5E |    7   14   10    8   22    4   15   11    8   14    4 |    20   22   20   22   23   19   21   24   23   21    19
   6  |    7   11    7   12   11    5   10    8    7   18    4 |    19   27   20   19   18   18   25   22   23   29    20
   7  |    6   16   13   13   12    4   13   11   10   18    4 |    29   33   28   32   33   29   32   32   30   35    29
   8  |    8   15    6    6    7    2   11    6    7    7    3 |    19   26   22   24   20   21   26   23   22   25    21
   9  |    7   11   12   10    9    5   11    7    8   10    3 |    27   35   31   29   29   28   36   30   32   34    29
  10E |   10   16   10    7   16    4   10    8    8    9    4 |    23   32   27   25   25   23   24   25   26   26    24
  11  |    6   14   16    8   11    4   12    5    6    9    3 |    28   36   25   33   33   28   35   26   27   29    28
  12E |    6   17    8   11   24    5   14   10   12   11    4 |    46   49   45   45   44   43   44   45   42   46    44
  13  |    7   14   13   10   14    4   14   15   10   16    4 |    16   28   15   19   15   16   23   23   20   24    17
  14  |   11   10   13   15    7    5   10   11   12   19    4 |    18   19   17   33   19   23   21   26   24   31    21
  15  |    9   15   13   11   17    6   15   18   11   15    5 |    44   50   45   37   36   39   49   38   43   45    42
  16E |   12   19    9   12   10    6   15   12   10   15    4 |    24   23   25   26   21   24   24   24   24   27    22
  17  |    8   23   11   12   11    7   13   11   14   13    4 |    18   28   19   20   15   18   26   22   25   24    19
  19  |   10   29   11   17   11    6   17   12   13   15    5 |    16   28   20   25   18   21   24   22   26   23    19
  20E |    8   12    7    8   12    4   11   13   10   12    4 |    23   24   25   25   26   24   26   26   30   28    24
  21  |   11   10    8    9    9    5    9   11   10   12    3 |    18   22   16   20   15   17   21   19   21   20    16
  22E |    7   10    8   10   14    4   10    7    6    9    3 |    19   18   21   20   23   18   22   24   21   25    19
  23  |    9   23   12   12   11    7   12   16   10   17    5 |    15   19   15   25   18   21   19   25   24   26    17
  24  |    8    9   12   11    9    3   10    5    7   13    3 |    18   29   21   20   18   18   24   18   21   29    20
  25E |    7   12   13    9   18    5   12   14    9   12    4 |    23   27   28   23   19   24   29   22   23   25    22
  26E |   10   18   11    9   21    2    9    8    9   12    4 |    20   27   26   27   22   24   27   24   24   22    22
  27  |    6   12    7    8   10    3   10    7    9   10    3 |    19   28   24   26   19   24   23   24   21   23    22
  28E |   18   14    8   13   34    5   13    9   12    7    6 |    32   28   24   28   39   26   27   29   32   30    27
  29  |   12   19    9   13   10    4   17   13   11   16    4 |    22   23   19   23   16   20   23   22   21   21    19
 X30  |    7  ---   10  ---  ---   75  ---  ---  ---  ---    8 |    89  ---   20  ---  ---  153  ---  ---  ---  ---    89
  31  |    8   13   12   12   11    3   11   11   10   13    4 |    29   35   29   28   29   28   33   30   31   30    28
  32  |    6   12   13    6    8    3    9    9    8    7    3 |    18   31   23   22   18   19   27   20   21   23    20
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   16   11   11   15    5   12   11   10   13      |T   25   28   23   25   23   28   26   25   25   27    25
 WRMS |    8   16   11   10   12    4   12    9    9   12      |NE  20   28   22   25   21   22   26   23   24   26    21
 MEDI |    8   14   10   11   11    4   12   11   10   12      |MD  20   27   22   25   20   23   24   24   24   26    22

Table 3.1988.3   GPS week: 1988   Day: 3   MJD: 58163.000                            

        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   12    7    8    9    4   13    5    6    8    3 |    18   23   16   21   15   17   25   20   18   25    18
   2  |    8   13   12   16   13    6   12   16   11   14    5 |    17   21   20   29   17   21   19   25   25   25    19
   3E |    6   13    9    8   21    4   10    8    7    6    3 |    23   25   25   23   20   23   25   23   25   23    22
  X4E |    2  ---  ---  ---  ---   26  ---  ---  ---  ---    0 |    34  ---  ---  ---  ---   25  ---  ---  ---  ---    34
   5E |    9   13    7   11   28    5   15   10    7   15    5 |    25   27   25   27   37   24   25   30   29   30    27
   6  |    6   10   10   10    6    4   10    8    7    9    3 |    20   23   20   19   17   20   23   21   22   23    19
   7  |    9   16   13   11    9    3   11   12    9   16    4 |    29   30   27   26   26   26   34   26   26   30    26
   8  |    6   12    7    6   10    3   11    6    7    7    3 |    25   29   25   29   20   24   28   25   30   29    25
   9  |    7    9   11    9    9    5    9    8   11   16    4 |    21   30   26   22   21   22   31   23   26   34    23
  10E |   10   17    9    8   71    5   12    9   10    7    4 |    23   29   29   27   66   25   27   27   27   26    25
  11  |    5   13   15    8    9    5   13    5    6   10    3 |    30   38   23   31   32   29   37   27   30   31    29
  12E |    6   16   10   11   18    4   15    7   11   11    4 |    31   32   28   31   22   29   31   32   33   30    29
  13  |    6   13   12   11   11    4   13   13    8   15    4 |    15   25   13   18   12   16   24   25   21   25    16
  14  |   13   11   14   18    9    4   11   12   14   21    5 |    18   19   17   34   15   21   19   25   26   30    20
  15  |    9   14   12   11   14    4   12   17   10   12    4 |    43   51   45   40   41   42   49   41   40   45    42
  16E |   12   19   11   11   13    4   13   11   10    8    4 |    23   22   25   26   20   24   23   25   23   22    21
  17  |    8   14   13   11    9    2   12   10   12   11    4 |    19   26   16   23   15   17   24   23   22   21    18
  19  |    7   18   13   14   10    3   14   12   11   13    4 |    16   23   17   21   15   17   20   21   22   17    16
  20E |    9   13    7    9   12    5   11   13   11   12    4 |    30   28   25   32   31   28   28   28   28   32    27
  21  |   13   12   10    9   15    6   13   11   10   14    4 |    20   24   16   22   18   18   25   22   21   24    19
  22E |    8   13    6    8   15    4   11   11    7    8    3 |    32   30   31   32   36   31   32   32   32   34    31
  23  |    6   22   12   15   14    7   12   16   10   18    5 |    17   18   15   24   15   19   18   24   25   23    17
  24  |    6    6   12    9    8    3    9    7   10   12    3 |    16   23   20   20   12   16   24   18   19   24    17
  25E |    7   10   14    9   19    6   10   15    9   11    4 |    22   30   29   26   26   24   29   23   24   27    24
  26E |   10   25   13    7   18    4   10    8    6   11    4 |    24   37   33   28   26   28   27   28   28   28    27
  27  |    6   13   10    7    9    4    9    5    9   10    3 |    20   26   21   22   16   20   22   23   26   22    21
  28E |    7   14    7   10   19    4   13   15   12    8    4 |    28   28   28   27   30   26   28   35   28   29    28
  29  |   11   19    8   12   11    6   16   13    9   14    4 |    24   24   19   22   19   20   21   22   23   24    20
 X30  |    8  ---   10    6  ---    7  ---    7  ---  ---    4 |    17  ---   17   18  ---   28  ---   21  ---  ---    18
  31  |   10   14   12   12   12    4   11    9   12   13    4 |    28   31   28   26   26   26   32   26   28   28    26
  32  |    8    9   14    8   10    3   11    9   12   10    4 |    20   27   20   23   15   19   28   21   23   22    19
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   14   11   11   19    4   12   11   10   12      |T   23   27   23   25   23   23   26   25   25   27    23
 WRMS |    8   14   11    9   12    4   12   10    9   12      |NE  21   26   20   24   18   20   26   22   24   25    20
 MEDI |    8   13   11    9   12    4   12   10   10   11      |MD  23   27   23   26   20   24   25   25   26   26    22

Table 3.1988.4   GPS week: 1988   Day: 4   MJD: 58164.000                            

        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   11    7    7    7    3   13    7    6    9    2 |    19   27   18   20   18   18   26   20   21   27    19
   2  |    6   17   11   14   14    5   12   16   10   16    5 |    21   27   24   26   20   22   22   23   24   28    21
   3E |    9   10   11    9   18    7   11    7    6   10    4 |    20   22   25   22   18   21   24   24   21   26    20
  X4E |    3  ---  ---  ---  ---   27  ---  ---  ---  ---    0 |    32  ---  ---  ---  ---   35  ---  ---  ---  ---    33
   5E |    8   13    8   14   18    5   12    8    9   17    4 |    28   26   26   31   26   25   28   28   27   38    27
   6  |    9   10    7    9    9    6    9    8    5   15    3 |    21   27   22   18   18   19   26   20   21   22    19
   7  |    9   12   12   10    7    3   13   11    9   19    4 |    33   38   32   34   33   32   35   36   36   39    33
   8  |    9   10    6    5    9    4   13    7    6    8    2 |    27   32   27   28   25   25   33   29   27   31    26
   9  |   11    9   12   10   10    4    9    8    7   23    4 |    28   38   33   31   31   30   36   31   32   43    31
  10E |   10   12   10    8   17    5   11   11    8    8    4 |    21   25   25   23   23   21   25   24   25   22    21
  11  |    7   13   14    7   10    5   13    8    7   10    3 |    24   35   21   29   29   26   36   24   29   26    25
  12E |   11   19    6   13   16    3   18    7    9   19    4 |    28   33   28   33   27   29   31   29   30   36    28
  13  |    8   14   13   14    7    4   16   14    9   20    4 |    18   26   18   24   17   20   27   22   21   25    19
  14  |   13   10   14   17    7    5   11   12   13   20    5 |    18   21   16   35   22   25   21   29   31   33    23
  15  |    9   14   12   14   10    6   15   18   12   17    5 |    38   43   36   32   35   34   44   34   36   44    36
  16E |   12   19   11    9   13    4   14    9    7    8    4 |    25   27   30   28   29   28   28   28   28   25    26
  17  |   13   14   11   16   16    3   12   15   10   16    5 |    25   30   24   26   23   22   28   24   23   24    22
  19  |   11   20   13   14   11    3   15   16   10   17    5 |    18   21   19   24   17   19   22   21   20   22    17
  20E |   18   13    9    9   10    8   11   14    7   18    4 |    30   25   24   22   26   24   24   25   25   29    23
  21  |   17   10    9   20   10    4   12   11   11   14    5 |    24   26   20   28   16   19   23   21   21   21    19
  22E |    8    9    7    9   11    5   11   10    7   12    3 |    23   26   26   26   28   24   27   29   26   30    25
  23M |    8   21   11   13   15    6   12   16   13   22    5 |    18   22   15   25   20   20   22   28   25   33    20
  24  |   10   10   11   10    9    3    9    8    7   18    4 |    17   24   19   21   13   17   24   17   19   30    17
  25E |    8   10   14   27   16    7   10   16   11   13    5 |    33   30   35   45   32   28   32   29   28   30    29
  26E |    8   13   11    8   16    5   12    6    6   12    4 |    22   26   27   22   22   21   25   24   24   23    22
  27  |    8   11    8    8    8    5   13    6    8   11    3 |    19   26   19   20   18   19   25   21   21   19    19
  28E |    9   15    9   10   13    5   16   14   10   12    4 |    27   25   24   25   29   23   28   30   24   27    24
  29M |   14   21    8   13    8    4   17   14   11   16    5 |    24   23   19   24   18   20   23   22   25   24    20
 X30  |    5    9   10    9    9    5   11    7    5  ---    3 |    17   27   17   17   18   21   26   22   20  ---    18
  31M |    9   12   13   11   11    3   12   16   11   13    4 |    30   35   30   31   28   30   35   36   29   35    30
  32  |    6    8   13   10    8    3    9    9    8   11    3 |    21   29   23   23   18   20   29   21   24   21    21
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   14   11   12   12    5   13   12    9   15      |T   24   28   24   26   23   23   27   25   25   28    23
 WRMS |   10   14   11   12   11    5   13   11    8   14      |NE  22   28   22   26   21   22   28   24   25   28    22
 MEDI |    9   12   11   10   10    5   12   10    8   15      |MD  24   26   24   25   22   22   26   24   25   27    22

Table 3.1988.5   GPS week: 1988   Day: 5   MJD: 58165.000                            

        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   12    7    7    9    4   13    6    7    9    3 |    16   22   16   17   17   16   21   20   17   22    16
   2M |    8   14   12   12   16    4   12   15   10   13    4 |    18   23   18   24   19   19   22   19   23   20    18
   3E |    8    9   10    7   16    4   11    8    8    7    3 |    26   25   28   26   24   25   23   28   28   26    25
  X4E |    2  ---  ---  ---  ---   31  ---  ---  ---  ---    0 |    34  ---  ---  ---  ---   31  ---  ---  ---  ---    33
   5E |    8   14    9    8   18    6   17   17    7   12    4 |    30   30   27   29   28   26   29   33   29   33    28
   6M |   10   11   11    8    7    4   10   12    9   11    3 |    68   74   71   73   68   72   74   76   76   76    72
   7  |    8   16   14   10    8    5   13   16   11   17    4 |    37   39   34   38   35   38   36   45   37   40    37
   8  |    7   11    7    6   12    4   10    6    5    6    3 |    21   26   22   21   19   21   23   24   23   24    21
   9  |    8    8   13   10   10    5   10   10   10   12    4 |    27   30   28   21   20   26   30   29   25   33    25
  10E |    9   10   10    8   19    3    9    6    6    7    3 |    30   34   35   31   29   31   28   35   32   35    31
  11  |    7   14   15    7   11    4   11    7    7    9    3 |    24   34   22   26   26   23   30   21   25   20    23
  12E |    7   19    6   12   22    5   18   10    9   12    4 |    36   38   34   37   40   34   34   39   37   36    36
  13M |    7   15   13   11   13    3   14   12    9   14    4 |    17   26   15   17   15   16   23   23   18   24    17
  14  |    9   12   15   16   12    4   13   14   13   20    5 |    27   27   26   41   29   31   26   39   33   41    31
  15M |    8   18   13   12   16    6   17   18   12   14    5 |    34   41   34   32   26   32   42   36   34   39    33
  16E |   10   19   11    9   13    4   16   15   11   10    4 |    34   38   36   34   32   35   33   43   37   36    35
  17  |    6   16   13   16   11    5   14   13   11   14    4 |    19   29   17   29   15   19   25   25   23   22    19
  19  |    9   20   14   15   10    7   16   15   10   16    5 |    26   29   20   30   20   22   23   28   25   28    23
  20E |    9   11    6    9   20    4   10   12    7    8    4 |    29   26   28   29   31   28   28   28   28   28    27
  21  |   15    9    7    9   13    6   11   14   11   13    4 |    20   22   16   17   17   16   19   23   21   24    17
  22E |    8    9    8    8   18    5   12    9    7    9    3 |    26   26   26   27   32   25   24   29   25   27    25
  23  |    8   22   13   13   16    7   14   14   16   18    5 |    19   23   20   25   15   23   20   27   28   27    21
  24  |    7    8   12    9    9    4    8   12    8   13    3 |    21   28   25   28   21   24   28   23   25   28    23
  25E |    5    8   12    8   17    5    9   16    8   12    4 |    25   26   29   28   24   25   30   23   26   24    24
  26E |   12   25   14   10   24    5   10    8    7   11    5 |    21   30   28   25   19   22   22   24   23   26    21
  27  |    9   10    7    8   12    4   10    8    7    7    3 |    25   28   26   25   20   25   25   32   27   29    26
  28E |   10   14    9   10   19    5   12   14   12    7    4 |    34   32   28   29   36   29   29   35   32   31    30
  29  |   16   21    8   16   10    5   16   14    9   13    5 |    28   26   20   27   20   25   23   28   27   25    24
  30M |    5   13   11    7   10    3    9    7    8    9    3 |    18   27   17   18   14   20   23   21   20   19    18
  31  |    8   14   12   11   13    3   12   12    9   13    4 |    37   39   32   39   31   37   37   41   37   42    36
  32  |    8   10   12    7    9    4   11   10   10   12    3 |    20   29   19   22   18   21   28   25   22   26    20
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   14   11   10   14    5   13   12    9   12      |T   27   30   26   28   25   27   28   30   28   30    26
 WRMS |    9   14   11    9   14    5   13   11    8   11      |NE  23   28   22   26   21   23   26   27   25   28    23
 MEDI |    8   13   11    9   13    4   12   12    9   12      |MD  26   28   26   27   21   25   26   28   26   27    25

Table 3.1988.6   GPS week: 1988   Day: 6   MJD: 58166.000                            

        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   11    7    6   11    3   13    7    8    9    3 |    17   25   19   20   18   19   24   19   21   25    19
   2  |   10   18   11   15   14    4   11   16   12   14    5 |    22   27   24   30   19   23   23   25   29   27    23
   3E |    7   12   10    8   15    3   10    9    8    8    3 |    22   22   27   25   22   21   22   23   21   24    22
  X4E |    3  ---  ---  ---  ---   32  ---  ---  ---  ---    0 |    38  ---  ---  ---  ---   38  ---  ---  ---  ---    38
   5E |   10   19   10    9   19    5   14   13    8   11    4 |    39   40   39   44   40   39   39   42   42   37    39
   6  |    8   14    8    9   10    3   13   10    6    9    3 |   207  205  205  204  205  205  205  203  204  204   205
   7  |    9   14   11    9   11    4   14   12   10   17    4 |    54   56   55   52   52   54   55   57   56   54    54
   8  |    7   13    5    5   13    3   12    7    6    5    3 |    23   27   25   25   24   24   27   25   25   24    24
   9  |    9    8   13   10    9    4   10   12   12   11    4 |    33   37   37   30   33   32   38   33   32   36    32
  10E |   10   13   11    7   19    4    9    9    8   10    4 |    23   28   30   26   29   26   25   26   26   29    25
  11  |    7   13   14    6   12    4   12    8    6    9    3 |    29   40   28   33   36   32   39   32   35   33    32
  12E |    5   21    8   11   26    4   17    8    9   11    4 |    39   41   38   39   39   38   41   39   43   38    39
  13  |    7   16   13   12   10    3   13   12    9   15    4 |    23   30   20   28   21   23   28   29   27   27    24
  14  |   10   11   11   18   13    4   14   11   11   18    5 |    31   30   28   43   31   34   31   38   35   40    33
  15  |    7   14   12   11   10    3   15   15   11    9    4 |    68   69   66   65   55   64   68   64   65   65    65
  16E |   14   21   10   11   14    5   12   12    8    9    4 |    31   31   32   32   27   32   32   33   32   31    30
  17  |    9   13   11   16   15    3   12   13   10   13    4 |    22   28   23   28   17   22   26   25   23   23    22
  19  |    9   15   12   18   12    4   12   15   12   17    5 |    21   25   24   27   18   21   22   25   26   24    21
  20E |    9   15    9    9   48    6   13   14    8    9    6 |    56   52   54   56   80   54   53   52   56   53    55
  21  |   16    9    8   12   12    3   10   11   10   12    4 |    21   23   18   19   17   18   25   22   24   21    19
  22E |    6   11    6    8   20    4   11    8   10   11    3 |    35   36   34   34   36   32   36   32   34   36    33
  23  |    6   23   13   14   18    7   14   18   15   18    5 |    25   28   26   32   22   28   27   30   33   28    25
  24  |    8    8   11    9   15    3    8   12    9   13    4 |    21   28   21   24   21   20   25   22   22   30    22
  25E |    6   16   11    8   22    4   10   13    8    9    4 |    39   43   45   42   36   39   42   39   40   36    39
  26E |    8   15   11    9   26    4   11    7   10   10    4 |    34   38   41   39   34   35   37   36   38   38    36
  27  |    7   13    8    7   12    4   10    7    7    9    3 |    23   28   24   24   22   25   27   26   25   23    23
  28E |    5   13    6    8   20    3   10   14    8    6    3 |    27   29   29   28   35   28   29   34   31   31    29
 X29  |   18  ---    8   12   12    5   16   13    9   12    5 |    28  ---   20   23   21   22   26   24   24   21    22
  30  |    4   12   10    8    9    3   10    7    6    8    3 |    21   29   21   20   16   20   25   21   22   19    20
  31  |   10   15   11   13   13    5   11   11   13   14    4 |    67   70   68   64   67   64   71   65   65   65    66
  32  |    7    9   11    5    9    5   13   11    6    7    3 |    22   28   22   22   20   21   29   23   20   22    21
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   14   10   11   18    4   12   12    9   12      |T   37   41   38   39   37   37   39   38   39   38    37
 WRMS |    8   14   10    9   15    4   13   10    8   11      |NE  26   31   27   28   25   26   30   28   28   29    26
 MEDI |    8   13   11    9   13    4   12   11    9   10      |MD  28   30   28   30   27   28   29   30   31   30    29



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 4.1988   GPS week: 1988   MJD: 58160.0-58166.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2958 |U   10     9    23 |U   10    15    42 |U    8    12    26 |
emr | emr 2834 |U   19    16    45 |U   16    25    52 |U   15    15    45 |
esa | esa 2866 |    13    11    33 |U   10    15    43 |     9    11    30 |
gfz | gfz 2865 |U   10     7    27 |U   11    15    48 |U    9    12    27 |
grg | grg 2797 |U   10     8    27 |U   10    14    44 |    12    15    27 |
igr | igr 2876 |    10     8    27 |    10    14    45 |     9    12    30 |
igs | igs 2878 |    10     8    27 |    10    14    43 |     9    11    26 |
jpl | jpl 2852 |    16    14    41 |U   12    19    48 |    12    14    41 |
mit | mit 2866 |    20    14    43 |U   11    15    51 |U   39    25    88 |



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 5.1988.0   GPS week: 1988   Day: 0   MJD: 58160.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2974 |    13    12    29 |     8    16    37 |     8    10    20 |
emr | emr 2880 |    20    18    53 |    14    33    47 |    15    15    46 |
esa | esa 2880 |    16    13    39 |     8    17    39 |     9     9    25 |
gfz | gfz 2880 |    10     9    30 |    10    15    45 |     7     9    20 |
grg | grg 2592 |    12    15    36 |     9    17    40 |    14    14    27 |
igr | igr 2880 |    12    10    31 |     8    16    41 |     8     9    21 |
igs | igs 2880 |    12    11    31 |     8    18    38 |     8    10    22 |
jpl | jpl 2880 |    16    13    41 |    11    22    41 |    12    14    39 |
mit | mit 2880 |    57    38   114 |     8    19    45 |   206    92   427 |

Table 5.1988.1   GPS week: 1988   Day: 1   MJD: 58161.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     9     6    20 |     9    16    51 |     9    10    21 |
emr | emr 2859 |    19    15    46 |    18    28    55 |    16    10    42 |
esa | esa 2880 |    12     9    30 |     9    16    47 |    11    10    24 |
gfz | gfz 2880 |     9     7    29 |    10    16    53 |    10    11    23 |
grg | grg 2784 |     8     6    19 |    12    14    45 |    13    12    21 |
igr | igr 2880 |     9     6    25 |     9    16    51 |     9     9    21 |
igs | igs 2880 |     9     5    23 |    10    17    47 |    10    10    22 |
jpl | jpl 2880 |    16    13    37 |  ----  ----  ---- |  ----  ----  ---- |
mit | mit 2880 |    10     4    21 |    12    19    52 |    10     8    30 |

Table 5.1988.2   GPS week: 1988   Day: 2   MJD: 58162.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2880 |     8     9    23 |    12    12    47 |     8    10    22 |
emr | emr 2783 |    21    18    44 |    14    24    47 |    15    11    50 |
esa | esa 2784 |    17    13    40 |    12    12    49 |     9     9    29 |
gfz | gfz 2783 |    12     8    31 |    14    11    52 |    10     9    21 |
grg | grg 2784 |    12     7    32 |    11    12    43 |    10    14    22 |
igr | igr 2857 |    12    10    29 |    12    10    51 |    15    19    48 |
igs | igs 2868 |    13    10    32 |    12    11    46 |     9     9    23 |
jpl | jpl 2784 |    20    16    48 |    13    17    57 |    13    10    44 |
mit | mit 2784 |    14    10    32 |    12    12    56 |     9    12    22 |

Table 5.1988.3   GPS week: 1988   Day: 3   MJD: 58163.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2970 |     8     8    25 |    11    12    44 |     8    12    31 |
emr | emr 2781 |    18    17    45 |    17    22    49 |    14    18    46 |
esa | esa 2880 |    12     9    31 |    10    13    44 |     9    11    32 |
gfz | gfz 2879 |     8     6    28 |    12    14    53 |     9    13    33 |
grg | grg 2784 |     9     7    27 |    11    13    49 |    15    14    33 |
igr | igr 2880 |     9     6    27 |    10    12    48 |     9    12    31 |
igs | igs 2880 |     9     6    26 |    11    12    46 |     9    13    29 |
jpl | jpl 2784 |    13    12    43 |    14    21    50 |    13    17    38 |
mit | mit 2880 |    10     7    25 |    12    13    55 |    10    12    27 |

Table 5.1988.4   GPS week: 1988   Day: 4   MJD: 58164.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2972 |    10     8    20 |    10    15    45 |    10    13    30 |
emr | emr 2879 |    19    16    42 |    18    24    63 |    16    14    45 |
esa | esa 2880 |    15    11    34 |    10    13    47 |    11    12    32 |
gfz | gfz 2880 |    11     7    25 |    10    16    52 |    10    12    29 |
grg | grg 2880 |     8     7    26 |     9    11    36 |    12    13    28 |
igr | igr 2880 |    11     7    26 |    10    13    46 |    10    11    28 |
igs | igs 2880 |    11     8    27 |    10    13    48 |    11    12    28 |
jpl | jpl 2880 |    15    14    41 |    13    18    57 |    12    12    39 |
mit | mit 2880 |    16    17    35 |    10    13    53 |    15    14    44 |

Table 5.1988.5   GPS week: 1988   Day: 5   MJD: 58165.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2965 |     9     9    24 |    11    17    38 |     8    13    32 |
emr | emr 2879 |    17    14    40 |    15    24    50 |    15    15    46 |
esa | esa 2880 |    11    11    26 |    10    16    40 |    10    13    36 |
gfz | gfz 2880 |     9     7    24 |    11    18    41 |    10    14    32 |
grg | grg 2880 |     8     6    25 |    13    21    47 |     9    15    32 |
igr | igr 2880 |     9     6    25 |    10    15    42 |     9    12    32 |
igs | igs 2880 |     9     6    24 |    10    16    42 |     9    12    31 |
jpl | jpl 2880 |    12    14    38 |    11    19    45 |    14    10    43 |
mit | mit 2880 |    13     8    33 |    14    19    59 |    12    19    40 |

Table 5.1988.6   GPS week: 1988   Day: 6   MJD: 58166.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2975 |    10     9    24 |     9    14    34 |     8    15    28 |
emr | emr 2783 |    22    18    43 |    17    20    52 |    15    19    42 |
esa | esa 2880 |    12    11    28 |     9    15    35 |     8    15    32 |
gfz | gfz 2878 |    11     9    26 |     9    15    39 |    10    15    31 |
grg | grg 2880 |    10    11    28 |     9    16    45 |     9    22    29 |
igr | igr 2880 |    10     7    26 |     9    14    37 |     7    14    29 |
igs | igs 2880 |    10     7    26 |     9    14    36 |     8    15    27 |
jpl | jpl 2880 |    18    15    43 |    11    17    42 |    12    20    44 |
mit | mit 2880 |  ----  ----  ---- |    11    14    37 |    11    18    29 |


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 6.1988   GPS week: 1988   MJD: 58160.500-58166.500

                                                         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 |       1      -5      62      28     -7 |       7     21
            |      19      21      67      52      6 |       3
emr   uuuux |       7      19    -140      31     25 |      25     35
            |      16      15     105      48     15 |       8
esa   uuuuu |       2       8      14     -37     -3 |      18     25
            |      18      13      25      64      6 |       3
gfz   uuuuu |      -3      -7     102    -222      0 |      12     18
            |      23       9      86      76      3 |       3
grg   uuuuu |      20      23     -12      76     -1 |      -1     14
            |      23      20      53      55      4 |       3
igr   xxxxx |      12       2       1      57      1 |       0     16
            |      11      18      47      55      4 |       2
irf   xxxxx |       5     -20      47     -18     -1 |       4     19
            |      11       6      26      21      6 |       3
jpl   xxxxx |     -12     -25       8      43     -1 |      25     33
            |      24      17      46      41     17 |       3
mit   uuuuu |       2     -22     118      23      4 |      19     27
            |       9      18      62      37      6 |       4
ngs   uuuuu |      -7       2     -81     108      7 |       9     19
            |      17      31      66     135      4 |       4
sio   uuuux |     -15      -9    -142     -37     12 |      55     58
            |       9       9      59      50     12 |       9


Table 7.1988.0   GPS week: 1988   Day: 0   MJD: 58160.500

                                                         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 |      17     -28      55      19      4 |       1     18
emr   uuuux |      -8      19     -99      65     13 |      14     21
esa   uuuuu |     -13      -5      26      50     -3 |      14     21
gfz   uuuuu |      -5     -23     137    -174     -4 |       6     12
grg   uuuuu |       3      18      57      86     -5 |      -7     14
igr   xxxxx |      30      -2      82      57     -3 |      -5     13
irf   xxxxx |       5     -18      63       1     10 |      -3     16
jpl   xxxxx |     -24     -27       6       9      5 |      19     26
mit   uuuuu |      17      -2     121      -2     10 |      11     19
ngs   uuuuu |      -9      35    -119     -19      3 |       1     12
sio   uuuux |      -1      -8    -164     -16     10 |      40     45

Table 7.1988.1   GPS week: 1988   Day: 1   MJD: 58161.500

                                                         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 |     -25     -10      23      89    -12 |       8     23
emr   uuuux |      10      -6     -18     116      1 |      21     31
esa   uuuuu |      20      32      39      54    -11 |      20     28
gfz   uuuuu |       5      -9     208    -173      5 |      11     19
grg   uuuuu |      43     -11       7      89      5 |      -1     16
igr   xxxxx |      13      11     -15      56     -4 |       1     16
irf   xxxxx |      16     -21      45      15     -3 |       4     22
jpl   xxxxx |      -5     -37       3      15      1 |      27     34
mit   uuuuu |      11     -32      72      50      1 |      18     28
ngs   uuuuu |     -30      23    -177    -102      0 |       7     20
sio   uuuux |      -7       5    -128    -100     17 |      48     54

Table 7.1988.2   GPS week: 1988   Day: 2   MJD: 58162.500

                                                         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 |       2     -15     126      35     -8 |       9     22
emr   uuuux |       6      35    -111       3     31 |      21     31
esa   uuuuu |      -9       7       4     -29     -6 |      20     28
gfz   uuuuu |       6       2     176    -339      1 |      12     19
grg   uuuuu |      32      41     -15      72     -2 |       0     14
igr   xxxxx |      16      -7      -8     -31      1 |       1     17
irf   xxxxx |       6     -24      12     -41     -2 |       6     20
jpl   xxxxx |     -22     -43     -54      27      4 |      26     34
mit   uuuuu |      -6     -13      35     -17      6 |      20     28
ngs   uuuuu |      -3     -13    -102     279     10 |       8     19
sio   uuuux |     -21      -9    -251     -72     13 |      53     56

Table 7.1988.3   GPS week: 1988   Day: 3   MJD: 58163.500

                                                         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 |       9       3     136      44    -13 |       9     22
emr   uuuux |      -9      15    -129     -31     36 |      24     34
esa   uuuuu |      13      -5      19     -92     -8 |      20     28
gfz   uuuuu |     -32       1       0    -301      4 |      13     19
grg   uuuuu |      23      49    -100     164      1 |       1     13
igr   xxxxx |      -3      28     -73      62      1 |       1     17
irf   xxxxx |     -13     -14      36     -43     -7 |       6     20
jpl   xxxxx |     -35     -40      81      -5    -16 |      26     34
mit   uuuuu |      -6     -29     133      23     -3 |      21     28
ngs   uuuuu |      19      -5    -122     189     10 |      10     20
sio   uuuux |     -27     -17     -78     -55     21 |      56     59

Table 7.1988.4   GPS week: 1988   Day: 4   MJD: 58164.500

                                                         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 |     -27     -27     -62     -51    -10 |       9     22
emr   uuuux |      12      37    -243      36     43 |      29     39
esa   uuuuu |      29      18      43     -64      3 |      19     27
gfz   uuuuu |      35      -8      36    -254     -1 |      15     20
grg   uuuuu |     -22      17      39      54     -2 |       2     14
igr   xxxxx |      21      18      31      11      4 |       1     17
irf   xxxxx |      17     -13      86     -13     -2 |       6     20
jpl   xxxxx |     -34       2     -33      79     25 |      27     34
mit   uuuuu |      -4     -55     200      92      5 |      22     29
ngs   uuuuu |      -3      33       0     123     11 |      12     21
sio   uuuux |     -19     -20    -110      23     26 |      60     63

Table 7.1988.5   GPS week: 1988   Day: 5   MJD: 58165.500

                                                         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 |      15      10      82     -22     -6 |       6     19
emr   uuuux |       2       7     -65       2     16 |      33     45
esa   uuuuu |     -13       4     -22     -82     -4 |      17     24
gfz   uuuuu |     -27      -8       6    -149     -1 |      14     19
grg   uuuuu |      41      17     -40      87      2 |       1     13
igr   xxxxx |       2     -17     -18     110      7 |       1     16
irf   xxxxx |      -6     -24      19     -22     -7 |       5     19
jpl   xxxxx |       6     -22       4      83    -28 |      27     34
mit   uuuuu |       4      -7      73      -3     -5 |      21     28
ngs   uuuuu |       3      -6      -9     215     11 |      12     22
sio   uuuux |     -20     -13     -93     -66    -12 |      63     66

Table 7.1988.6   GPS week: 1988   Day: 6   MJD: 58166.500

                                                         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      31      73      85     -6 |       4     20
emr   uuuux |      38      24    -319      24     35 |      35     46
esa   uuuuu |     -11       3     -11     -94      5 |      14     23
gfz   uuuuu |      -6      -1     152    -165     -1 |      13     19
grg   uuuuu |      18      29     -34     -22     -5 |       0     14
igr   xxxxx |       7     -17       5     132     -1 |       0     17
irf   xxxxx |      12     -29      65     -19      5 |       3     19
jpl   xxxxx |      31      -5      47      96      0 |      22     33
mit   uuuuu |      -1     -19     190      21     12 |      20     27
ngs   uuuuu |     -28     -51     -38      74      7 |      12     22
sio   uuuux |      -7       0    -171      29      8 |      63     66


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