[IGSREPORT-25634] Wk 1976 IGS Final Orbits

acc acc at igs.org
Mon Dec 11 02:39:50 PST 2017


Author:  AC Coordinator / GA MIT 

sum-file Version 2.0
Final IGS Orbit Combination - Week 1976   (Nov 19, 2017 - Nov 25, 2017)

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:

igs1976[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1976[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1976[0-6].cls  IGS GPS clock combination summary report.
igs19767.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs19767.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   | TIXI CHTI FAA1 TIXI TLSE
                0  |  EMR   | MCM4 YELL MCM4 YELL
                0  |  ESA   | AUCK CHTI DAV1 MAL2 BOGT CHTI
                0  |  GFZ   | GODE GODE
                0  |  GRG   | BAKE DAEJ GLSV JFNG KIT3 WIND BAKE DAEJ GLSV JFNG
                0  |  GRG   | KIT3 MAW1 REUN SEYG WIND
                1  |  COD   | TIXI HARB TIXI WIND
                1  |  EMR   | 25 2 20 25
                1  |  ESA   | MAR6 AUCK MAR6
                1  |  GFZ   | MAL2 MAL2
                1  |  GRG   | DAEJ GLSV JFNG KIT3 MAL2 MCM4 ZIM2 DAEJ GLSV JFNG
                1  |  GRG   | KIT3 MAL2 MCM4 SEYG ZIM2
                2  |  COD   | BJNM BRFT TIXI BJNM BRFT GLSV TIXI
                2  |  EMR   | 25 25 FAIR WHIT FAIR NIST WHIT
                2  |  ESA   | DGAR FAA1 MAC1 DGAR FAA1 MAC1 OUS2 WIND
                2  |  GFZ   | FAA1 FAA1
                2  |  GRG   | GLSV GRAZ JFNG KIT3 MAL2 ZIM2 GLSV GRAZ JFNG KIT3
                2  |  GRG   | MAL2 ZIM2
                2  |  MIT   | BRMU RBAY BRMU RBAY
                3  |  COD   | CHTI TIXI CHTI TIXI
                3  |  EMR   | 6 24 25 3 6 24 25 YELL YELL
                3  |  ESA   | MAL2 NICO MAL2 NICO
                3  |  GFZ   | BJNM DRAO MAL2 NTUS BJNM DRAO MAL2 NTUS
                3  |  GRG   | ARTU FAA1 GLSV NICO ARTU FAA1 GLSV KIRU NICO
                3  |  MIT   | 20
                4  |  COD   | FAA1 TIXI WTZR FAA1 SHAO TIXI WTZR
                4  |  EMR   | 25 25 BJNM YELL
                4  |  ESA   | CHTI MAL2 FAA1 MAL2
                4  |  GFZ   | CHTI FAA1 MAL2 MAL2 WSRT
                4  |  GRG   | JFNG JFNG
                4  |  MIT   | WTZR WTZR
                5  |  COD   | FAA1 TIXI TIXI
                5  |  EMR   | 25 25 GRAZ MCM4 GRAZ MCM4
                5  |  ESA   | MAL2 PDEL PDEL
                5  |  GRG   | GLSV KIT3 MCM4 GLSV KIT3 MAL2 MCM4 PDEL
                6  |  COD   | CHTI TIXI CHTI GLSV TIXI
                6  |  ESA   | LHAZ MAR6 ONSA FAA1 HARB LHAZ MAR6 ONSA REUN
                6  |  GFZ   | GODE LHAZ REUN CHTI GODE LHAZ REUN
                6  |  GRG   | JFNG LMMF MCM4 NKLG REUN SEYG WIND ZIM2 JFNG LMMF
                6  |  GRG   | MCM4 MGUE NKLG SEYG WIND ZIM2

 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. 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.

 7. 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 |     .2     .2     .6       6      7     -8    -.37
       EMR  |   0 |    6.0    7.9   17.0       1     18    -36     .0 
       ESA  |   0 |     .8    -.1     .3       9     -1     -7    -.24
       GFZ  |   0 |     .3     .7     .2       8    -23    -13    -.15
       GRG  |   0 |    3.8    1.6    7.8      39     20     10    -.12
       JPL  |   0 |    6.0    2.2   14.1      18    -21     70     .21
       MIT  |   0 |     .3     .7    7.9      17     44      5    -.08
       NGS  |   0 |   -3.4   -2.8   12.3      24     -7     16    -.03
       SIO  |   0 |     .5    3.0   13.9       6    -12     -6    -.31

       COD  |   1 |     .4     .2     .2       6     -3     -8    -.31
       EMR  |   1 |    7.7     .7    6.9       6     30    -38    -.08
       ESA  |   1 |     .9     .3     .4      10     -3     -5    -.30
       GFZ  |   1 |     .0     .3     .0       3    -21     -5    -.16
       GRG  |   1 |    3.6     .5   12.4      73     31     34    -.08
       JPL  |   1 |    6.2    6.2    8.4      27    -44     67     .01
       MIT  |   1 |     .7    -.5    9.4      10     22     -3    -.09
       NGS  |   1 |   -1.1    -.6   10.7      28     -5      0    -.11
       SIO  |   1 |    2.9     .7   19.6       2    -17     19    -.28

       COD  |   2 |     .6     .1     .6       4     -4     -4    -.36
       EMR  |   2 |    8.2    1.5   12.8      18     -9    -14    -.02
       ESA  |   2 |     .5    -.2     .4       0      2     11    -.25
       GFZ  |   2 |    -.1     .1     .3       5    -22      2    -.27
       GRG  |   2 |    3.2    1.1    5.1      32     11     34    -.01
       JPL  |   2 |    6.4    3.4   19.4      43    -26     54     .27
       MIT  |   2 |    2.3     .2    9.2     -24     27     20     .02
       NGS  |   2 |    -.7   -8.0   19.5     -42    -15    -12    -.15
       SIO  |   2 |    3.2     .0   21.6     -13     -9      3    -.17

       COD  |   3 |     .5     .3    1.1       8      8     -8    -.49
       EMR  |   3 |    6.0    4.1   12.9     -11     -4      2    -.22
       ESA  |   3 |     .0    -.5     .7      -8      6     15    -.54
       GFZ  |   3 |     .3     .1     .3       8    -17     -9    -.25
       GRG  |   3 |     .1     .8   -4.1      30     29     24    -.21
       JPL  |   3 |    5.0    3.1   14.0      21    -51     44     .25
       MIT  |   3 |    1.3     .9    9.5      -4     34    -13    -.18
       NGS  |   3 |    -.9   -8.8   12.5      -6    -21    -24    -.41
       SIO  |   3 |    1.5     .3   17.0      19     10    -15    -.21

       COD  |   4 |     .3     .1    1.3       7     12     -4    -.54
       EMR  |   4 |    6.4    8.8    5.0      13     22    -40    -.31
       ESA  |   4 |    -.1     .2    1.2      14      7     -4    -.49
       GFZ  |   4 |     .5     .0     .5      -2    -29     -3    -.23
       GRG  |   4 |    4.1    5.2    7.3      64     21     44    -.29
       JPL  |   4 |    -.7    3.1    4.7       9    -51     52     .16
       MIT  |   4 |    1.9    2.1   10.9      -1     34     -2    -.26
       NGS  |   4 |    2.1    -.7   12.0      22     -2    -15    -.31
       SIO  |   4 |     .4    3.5   18.0      16     -5    -11    -.28

       COD  |   5 |     .5     .6     .8      12      0     -5    -.48
       EMR  |   5 |    5.4    7.6    7.1      22     30    -36    -.36
       ESA  |   5 |    1.0    -.0    1.6      22     10      4    -.53
       GFZ  |   5 |     .5     .2     .7       2    -25    -20    -.25
       GRG  |   5 |    4.4    5.2   20.0      71      8     29    -.49
       JPL  |   5 |    4.8     .7   14.5      22    -11     80     .21
       MIT  |   5 |    3.6    2.9    6.6      13     37    -24    -.25
       NGS  |   5 |   -1.2    -.5    5.0      17    -31    -35    -.25
       SIO  |   5 |    2.3    5.6   17.5      13     -5    -15    -.30

       COD  |   6 |     .0     .7     .8       7      3    -10    -.47
       EMR  |   6 |    4.5    6.4   11.6       2     13    -66    -.44
       ESA  |   6 |     .8     .1     .9       4    -18     -6    -.59
       GFZ  |   6 |    -.1     .3     .6       2     -3    -14    -.28
       GRG  |   6 |    8.2    -.3   21.1      60     75     -7    -.16
       JPL  |   6 |   -1.1    6.5   10.8      35    -47     25     .20
       MIT  |   6 |    3.6    2.3    9.2      -4     32    -46    -.17
       NGS  |   6 |    -.5    5.6   17.4      24    -38    -30    -.22
       SIO  |   6 |    -.7    3.6   20.9      24      1    -36    -.12


 8. 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.

 9. 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 1.1976.a). It also displays the computed satellite
position sigmas for the combined orbits (Table 1.1976.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 2.1976.[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 3.1976.[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 5.1976.0-6). 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 1976 summary.                       (Nov 19, 2017 - Nov 25, 2017)

Table 1.1976.a   GPS week: 1976   MJD: 58076.000-58082.000

         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  275|   -1     0    -1    10     6    11   .03   11   10 |    -630      89     10     94
        |    0     0     1    14    11    22   .04           |     261     422
emr   79|    0     0     7   -18    -2     2   .20   14   14 |   22430      -2     17    127
        |    0     1     1    14    16    14   .04           |   55762     502
esa  150|    0     0     3    -3     9   -11   .01    9    9 |   -1538     690      8    161
        |    0     0     1    10    15    12   .01           |    1077    1049
gfz  194|    0     0    -1     7     1   -16   .14   10   10 |    -422     155     10    127
        |    1     0     1    11    17     6   .04           |     397     494
grg  107|    0     0     0   -19    -1     3  -.39   13   12 |    1086   -3058     13    204
        |    0     0     5    18    16    30   .02           |    2791    8132
igr  n/a|    0     0    -1   -20    -3     5   .03    4    4 |   -2716    -199     12     73
        |    0     0     1    13    12     6   .01           |     773     577
jpl   80|    0     0     7     0   -17    23   .21   12   12 | -713694      13     40    228
        |    1     0     1    24    10    14   .03           |  488957     531
mit  350|    0     0    -5    -7     1    -4   .00   11   11 |    -502    -187     42    305
        |    0     0     1    26    37    21   .02           |     196     307
ngs  212|   -1     0     3    14    -4    11   .04    9    8 |    -677     170    937   2239
        |    0     0     2    18    13    10   .04           |     281     442
sio  353|    1    -2    -4     0   -10     5  -.14   13   13 |     ---     ---    ---    ---
        |    0     0     1    38    33    17   .03           |     ---     ---


Table 1.1976.b   GPS week : 1976   MJD: 58076.000-58082.000   

         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    4    3    3    3    3    3 |
   2  |    5    5    5    5    4    5    4 |
   3  |    4    3    3    3    4    4    4 |
   4  |    0    0    0    0    0    0    0 |
   5  |    4    4    4    4    4    4    4 |
   6  |    3    3    3    4    3    3    3 |
   7  |    4    4    5    5    4    5    5 |
   8  |    4    4    5    4    4    4    4 |
   9  |    3    3    3    3    3    3    3 |
  10  |    4    4    4    3    4    3    4 |
  11  |    5    5    5    4    5    4    4 |
  12  |    5    5    5    5    4    5    5 |
  13  |    5    4    5    4    5    4    5 |
  14  |    4    4    4    4    5    4    4 |
  15  |    5    5    5    5    5    5    5 |
  16  |    5    5    5    5    5    5    7 |
  17  |    4    6    4    5    4    4    4 |
  18  |    5    5    5    5    5    4    5 |
  19  |    4    5    5    5    5    5    4 |
  20  |    4    4    4    4    4    4    4 |
  21  |    5    5    5    5    5    5    5 |
  22  |    3    5    4    3    4    4    3 |
  23  |    6    6    5    6    5    6    5 |
  24  |    4    4    4    5    5    5    4 |
  25  |    3    3    3    3    5    3    4 |
  26  |    3    4    3    3    3    4    4 |
  27  |    4    4    4    4    4    4    3 |
  28  |    4    5    4    4    4    4    4 |
  29  |    5    6    6    6    5    5    5 |
  30  |    3    3    4    4    4    4    4 |
  31  |    4    4    4    4    4    4    5 |
  32  |    3    4    3    3    3    3    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 2.1976.0   GPS week: 1976   Day: 0   MJD: 58076.000                            

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  275|    0     0     0     5    25    12   .01   10   10 |    -628     179      9     91
emr   80|    0     0     7   -19     5    10   .16   14   13 |    1574    -118     17    123
esa  150|    0     0     2    -5    16    -8   .00    8    8 |     -84   -1489      8    183
gfz  193|    0     0    -2    18     3   -18   .06    9    9 |    -834     546      9    132
grg  113|    1     0    -2   -18     0   -13  -.42   13   13 |     211    -453     13    217
igr  n/a|    0     0    -1   -36    -7    10   .02    4    4 |   -1892    -477     13     72
jpl   80|   -2     0     8   -28   -12    41   .17   13   13 |    1837    -120     44    232
mit  350|    0     0    -6   -31   -30    15  -.00   12   12 |    -270    -662     45    328
ngs  211|   -1     0     3    38     1     4   .10    8    8 |    -774     497    934   2604
sio  355|    1    -3    -3   -42   -24     4  -.11   14   14 |     ---     ---    ---    ---

Table 2.1976.1   GPS week: 1976   Day: 1   MJD: 58077.000                            

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  281|    0     0     1    33    11     0   .06   11   10 |    -207    -625      9     88
emr   80|    0    -1     6   -32     8    14   .15   14   14 |    2116    -230     17    133
esa  150|    0     1     0    -3    11   -23   .01    9    9 |    -874    1067      8    153
gfz  195|   -1     0    -1   -12   -15   -13   .17   10   10 |    -106     405     11    122
grg  115|    0     0     1   -39     2   -28  -.42   13   12 |     -62     443     13    202
igr  n/a|    0     0    -3   -33    -8     7   .04    4    4 |   -1625    -529     13     72
jpl   80|    0     0     5   -26   -11    34   .17   11   11 |    2294    -199     38    219
mit  350|    0     0    -5     9   -16    -4   .01   12   11 |    -566     271     42    313
ngs  212|    0     0     3     7    11    25   .08    9    8 |    -197    -639    883   2336
sio  359|    2    -2    -4    13   -21    12  -.16   13   13 |     ---     ---    ---    ---

Table 2.1976.2   GPS week: 1976   Day: 2   MJD: 58078.000                            

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  276|   -1     0    -1    29     0    -2   .02   12   11 |    -533    -105     11     97
emr   80|    1     1     7    11     6   -14   .23   14   14 |     940     392     19    158
esa  150|    0     0     1    -9     5   -10   .01    9    9 |   -1477    1865      8    140
gfz  196|    0     0    -3    10     2   -11   .14   11   11 |    -498     258     12    117
grg  115|    0     0     0   -35   -22    -1  -.39   12   11 |    7413  -21489     14    224
igr  n/a|    0     0    -2   -11    14    12   .05    4    4 |   -3061     718     13     79
jpl   80|    1     0     7    21   -19     9   .23   12   12 | -999999     847     39    216
mit  350|    0    -1    -6   -37    22    -1  -.01   11   11 |    -598    -183     42    349
ngs  216|   -1     0     6    33   -17    23   .02    8    7 |    -600     -61    809   1985
sio  354|    2    -3    -5   -35    11    12  -.12   14   15 |     ---     ---    ---    ---

Table 2.1976.3   GPS week: 1976   Day: 3   MJD: 58079.000                            

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  271|   -1     0     0     0     9    10   .04   10    9 |    -615      60     11     96
emr   80|    1     1     9   -17     1    -2   .22   15   14 |    1195    -832     17    107
esa  150|    0     0     4   -15    11    -8   .02    8    8 |   -2767     485      9    169
gfz  196|    0     0     0     3     4   -15   .16   11   10 |    -376      31     11    116
grg   93|    0     0   -11   -28     0   -18  -.38   13   12 |       8     107     14    210
igr  n/a|    0     0     0   -31   -12     5   .03    4    4 |   -2444    -974     12     78
jpl   80|    3     0    10     0   -26    10   .24   12   12 | -999999    -763     39    217
mit  350|    0     0    -3    25     6     5  -.01   10   10 |    -720    -207     40    283
ngs  217|    0     0     3    14    -8     0   .01    9    8 |    -568      56    779   2091
sio  341|    1    -1    -3    22    -3    27  -.11   13   13 |     ---     ---    ---    ---

Table 2.1976.4   GPS week: 1976   Day: 4   MJD: 58080.000                            

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|   -2     0    -2     2     6     3   .08   11   10 |    -752     147     10     96
emr   80|    1     1     5   -18     9   -17   .17   15   14 |  148884     776     17    116
esa  150|    1     0     4    12    31    -9  -.02    9    9 |   -3130    1026      9    168
gfz  195|    2     0    -1    23    33   -16   .18   10    9 |    -975     695     11    145
grg  106|    0    -1     2   -19    10     5  -.38   11   11 |    -107     137     12    192
igr  n/a|    0     0     0    -8    14    -1   .04    4    4 |   -3839     320     13     67
jpl   80|    1     0     6    20   -19    26   .25   12   12 | -999999     489     39    237
mit  350|    0     0    -5   -20   -53     2   .03   11   11 |    -575    -428     46    264
ngs  210|   -2     0     4    17     5     4   .04    9    8 |   -1003     444    876   2035
sio  359|    1    -1    -6   -16   -72    18  -.12   12   11 |     ---     ---    ---    ---

Table 2.1976.5   GPS week: 1976   Day: 5   MJD: 58081.000                            

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  277|   -2     0    -3     5   -12    -3   .07   11   10 |   -1084     800     11     96
emr   79|    0     0     8   -21    -7    17   .20   14   14 |     854     -27     16    114
esa  150|    1     0     5    -9    11     8  -.00    9    9 |   -1499    1108      9    167
gfz  195|    0     1    -1     6   -18   -29   .14    9    9 |     175    -790      9    118
grg   98|    0     0     4   -13   -23    18  -.36   13   12 |      87    -230     14    183
igr  n/a|    0     0     0   -18   -11    -4   .03    4    4 |   -3141    -458     11     65
jpl   80|    0    -1     8   -14     0    34   .20   12   12 | -999999    -296     40    260
mit  350|    0     0    -5    21    32     1   .02   11   11 |    -183    -193     42    306
ngs  212|   -2     0    -1     7     1    15   .03    9    8 |   -1001     689   1155   2293
sio  357|    0    -2    -2   -11    23   -13  -.15   12   13 |     ---     ---    ---    ---

Table 2.1976.6   GPS week: 1976   Day: 6   MJD: 58082.000                            

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  274|    0     0    -3    -3     3    61  -.03   10    9 |    -593     170     12     98
emr   80|    0    -1     6   -32   -37     9   .25   14   14 |    1450      19     16    139
esa  150|    0     0     3     8   -20   -29   .02    9    9 |    -941     774      8    150
gfz  193|    1     1    -1     1     1    -7   .13   10    9 |    -341     -54     12    143
grg  112|    0    -1     5    16    21    61  -.39   17   15 |      55      74     14    205
igr  n/a|    0     0    -1    -2   -14    11   .04    4    4 |   -3015       1     13     79
jpl   80|    0     0     6    31   -34     5   .23   13   13 | -999999     138     42    220
mit  350|    0    -1    -7   -23    51   -50  -.03   11   11 |    -603      87     41    297
ngs  212|   -2     0     5   -17   -25     9  -.00    8    8 |    -598     206   1126   2332
sio  351|    1    -1    -6    68    15   -21  -.18   13   13 |     ---     ---    ---    ---

       
       
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 3.1976.0   GPS week: 1976   Day: 0   MJD: 58076.000                            

        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    7   10    4   10   12    9   13    3 |    33   36   33   34   30   34   38   36   34   40    33
   2  |   13   12   10   11   11    5   10   13    9   20    4 |    31   28   28   29   26   28   26   32   27   32    27
   3  |    6   12    8   10   10    4   12   10    6   11    3 |    29   35   27   25   24   28   34   33   29   29    27
  X4E |    1  ---  ---  ---  ---   63  ---  ---  ---  ---    0 |   119  ---  ---  ---  ---   92  ---  ---  ---  ---   120
   5  |    8   10    9   11   12    3   11   10   10   11    3 |    28   28   31   25   26   26   29   24   28   22    26
   6  |    7    8    9    9   11    3   12    9    5   12    3 |    25   28   26   27   23   24   26   25   26   31    25
   7  |    9   13    6   11   16    3   14   11    8   11    4 |    45   48   45   49   50   45   49   50   49   48    47
   8E |    8   13   10    8   13    2   10   10   10    9    3 |    21   23   26   19   16   22   26   23   26   21    21
   9  |    8   10    4    5   10    4    9   10    5   10    3 |    24   28   25   26   25   23   30   27   25   30    25
  10  |    9   10    8    7   11    4   12   11   10   11    3 |    26   33   24   30   23   29   32   32   30   32    27
  11  |   12   15   12    8   14    7    9   14    8   13    4 |    37   34   24   32   32   30   32   30   30   33    29
  12  |   12   20    8   10   10    4   15   14   10   13    4 |    29   29   28   32   27   31   29   27   35   27    29
  13  |   10   13    8   10   15    4   13   12    9   19    4 |    29   31   27   27   30   26   32   28   28   24    26
  14  |    8    8    6    9   16    5    9   12    7   17    4 |    23   20   20   20   22   20   21   22   21   20    19
  15  |   13   15    8   12   17    5   10   15    9   18    4 |    41   44   39   34   42   36   41   35   37   33    36
  16  |    9   20    9   13   16    4   15   12    9   16    4 |    22   21   23   29   22   24   27   26   26   26    23
  17E |    9   13    5   11   16    5   12   16    8   11    4 |    39   36   39   43   35   41   37   42   43   43    39
  18  |   10   20    9   14    9    5   14   13   10   22    5 |    19   19   19   28   19   21   19   28   24   27    19
  19E |   11   15    6   11   15    5   25   11    8   11    4 |    54   52   54   55   55   55   57   54   55   57    53
  20  |    9   12    7    7   11    3   12   10   11   13    3 |    25   27   27   26   26   27   27   32   28   31    26
  21  |   14   10   10   10   13    5   15   14   12   21    5 |    26   29   27   28   29   27   29   34   24   34    26
  22  |    6    7   10    9   12    4    9    9    7   11    3 |    26   26   27   25   24   24   26   25   25   24    24
  23  |   12   28   10   10   17    8   19   19    9   16    5 |    27   28   20   22   20   21   24   22   23   19    19
  24  |    8   16    9    8   13    4   18   12    5   14    4 |    35   34   34   33   36   31   34   35   37   33    34
  25  |   10   11    5    5    8    3   17    9    6   11    3 |    21   24   21   19   20   20   26   23   25   25    21
  26  |    9   10    5    7   11    4   12    7    7   13    3 |    22   26   23   22   20   23   28   24   24   32    23
  27E |   11   12   11    9   13    2   11    8    9   10    4 |    23   27   28   22   23   24   26   24   27   23    23
  28  |    6   14   10   10   14    4    9   16    8   15    4 |    24   24   22   23   22   23   25   26   25   22    22
  29E |   15   16    4   12   21    5   14   11   10   13    4 |    65   62   65   64   64   63   61   65   67   64    64
  30  |    7   12    7    8   11    4   11    9    5   12    3 |    29   32   30   25   26   27   31   28   30   30    28
  31  |   12   11    5    9   13    6    9   11    7   12    3 |    45   48   45   49   42   46   49   50   47   47    46
  32  |    5    9    4    7   11    3   11   13    7    9    3 |    26   26   26   25   24   24   29   22   26   24    24
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   14    8    9   13    4   13   12    8   14      |T   33   31   30   30   29   31   32   31   31   31    32
 WRMS |   10   13    8    9   13    4   13   12    8   14      |NE  26   28   25   26   25   25   28   27   27   28    25
 MEDI |    9   12    8    9   13    4   12   11    8   13      |MD  27   28   27   27   26   27   29   28   28   30    26

Table 3.1976.1   GPS week: 1976   Day: 1   MJD: 58077.000                            

        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   11    6   13    5   10   11    7   16    3 |    36   36   34   34   35   34   38   37   38   42    35
   2  |   12   12   10   11   13    4   11   14   10   20    4 |    23   23   22   25   26   22   23   27   25   27    21
   3  |    6   11    8    9   10    3   11    8    5    8    3 |    28   35   28   24   25   27   35   27   26   27    26
  X4E |    2  ---  ---  ---  ---   36  ---  ---  ---  ---    0 |    95  ---  ---  ---  ---   78  ---  ---  ---  ---    95
   5  |    8   11    9    8   11    2   10   11    9   14    3 |    19   21   19   22   19   19   20   20   21   21    18
   6  |    5    9   10    8    8    4   10    8    5   10    3 |    19   24   19   20   20   19   25   22   19   26    19
   7  |   12   17    7   11   12    4   15   13   10   11    4 |    41   41   37   39   40   37   42   41   40   40    39
   8E |    9   12    9    7   16    3   10    9   10    9    4 |    19   20   25   20   21   19   23   22   24   21    19
   9  |    9    9    5    8    9    3    9    9    5    7    3 |    20   25   20   20   19   19   25   23   21   22    20
  10  |    9   11    9    9    7    3    9   14    6   14    3 |    23   29   20   29   24   22   29   25   20   28    22
  11  |   12   13   14    4   17    6   10   16   11   14    5 |    28   28   20   24   23   24   28   25   28   26    22
  12  |   11   20    9   10   13    4   13   11   12   11    4 |    31   31   30   35   31   34   32   33   34   32    31
  13  |   10   12   10   11   13    4   12   11    8   16    4 |    37   38   36   34   35   34   38   37   33   39    35
  14  |    9    7    8    8   16    5    8   11    8   17    4 |    18   18   17   19   18   17   18   19   16   16    14
  15  |    8   16    8   13   16    4   12   15    8   17    4 |    39   42   37   35   38   35   41   35   34   37    35
  16  |    7   26   11   14   13    5   14   12   12   16    5 |    22   19   22   29   18   22   20   20   23   18    20
  17E |   14   13    6   12   32    7   10   15    9   14    5 |    39   38   38   43   42   41   39   41   41   42    38
  18  |    8   21    8   14    9    3   14   12    8   19    4 |    19   15   19   33   21   21   18   27   20   25    20
  19E |   21   14   10   11   12    7   11   12   11   11    5 |    39   38   39   41   44   41   39   40   40   42    39
  20  |    9   12    8    9    9    3   11   10   10   13    3 |    30   29   31   32   30   31   31   32   31   36    30
  21  |   17    9   10   12   10    4   10   15   11   18    5 |    26   25   25   29   26   25   27   30   22   28    23
  22  |    7    9   10   21   12    3    7   11    9   13    4 |    18   16   19   29   17   17   18   15   16   14    16
  23  |   11   30   10   10   13    6   17   19    9   16    5 |    26   26   23   28   21   25   21   24   25   23    22
  24  |    8   11    9    8   14    4   10    7    5    9    3 |    40   40   39   40   41   38   42   38   39   37    38
  25  |    6   13    6    4    8    4   12    7    6   10    3 |    18   23   21   20   17   21   22   21   20   21    19
  26  |    8   11    6    8   11    4   10    8   12   15    3 |    22   24   20   23   16   20   24   20   22   27    20
  27E |    8   13   10    8   11    3   13   14    8   13    4 |    23   22   26   24   23   21   23   23   23   23    21
  28  |   10   13   12   10   11    4   10   14   12   10    4 |    21   26   22   19   22   20   25   21   24   18    19
  29E |   15   21    7   12   22    6   14   12   12   14    5 |    49   46   48   48   50   47   46   44   47   46    46
  30  |   10   10    9    7    9    4   11    6    6   10    3 |    32   37   36   33   34   33   37   34   33   36    33
  31  |   12   10    4    9   13    5    8   14    8   11    4 |    39   41   38   42   37   41   41   38   40   36    38
  32  |   12   11    6    5    9    2    9   13    7    7    3 |    30   31   28   28   29   26   31   26   27   26    27
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   11   14    9   10   13    4   11   12    9   13      |T   30   29   27   29   27   29   29   28   28   29    28
 WRMS |   10   14    9   10   12    4   11   11    8   13      |NE  25   26   24   26   24   24   26   25   24   26    23
 MEDI |    9   12    9    9   12    4   10   12    9   13      |MD  26   28   25   29   25   25   28   27   25   27    22

Table 3.1976.2   GPS week: 1976   Day: 2   MJD: 58078.000                            

        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   10    6    8    4   10    7    4   15    3 |    32   33   32   32   29   31   36   32   29   41    31
   2  |   15   11    9   14   11    4   12   13   11   19    5 |    32   32   32   37   29   35   28   36   38   37    33
   3  |    6   11    8    9    9    4   12    8    8   10    3 |    36   43   36   38   31   36   43   38   32   41    36
  X4E |    2  ---  ---  ---  ---   46  ---  ---  ---  ---    0 |    73  ---  ---  ---  ---   59  ---  ---  ---  ---    73
   5  |    7    9    9    8   12    4   12    8    9   14    3 |    37   33   36   34   30   35   37   32   38   38    35
   6  |   11   10   10    8    7    4   11    7    4   13    3 |    39   39   40   37   34   38   41   37   38   44    38
   7  |   11   18    8   13   17    4   18   12   11   11    4 |    37   40   35   37   36   35   41   36   39   36    36
   8E |   13   14   12    5   12    4   16   13   11   13    4 |    34   34   35   34   33   32   37   33   35   34    33
   9  |   10   10    6    8   10    4    9    7    6   11    3 |    42   43   42   43   40   42   44   41   43   45    42
  10  |    8    9   10    7    8    3    8   11    6   14    3 |    37   41   35   42   34   38   42   36   41   37    37
  11  |   11   11   13   10   13    4   10   16    8   14    4 |    34   32   31   36   32   33   36   34   32   37    32
  12  |   15   20    8   14   12    4   17   11   12   12    5 |    35   35   34   33   33   35   36   32   39   36    34
  13  |   10    9    9   11   17    4   10    9    9   20    4 |    32   39   34   34   34   33   38   33   33   32    33
  14  |   11    9    9    8   12    4   11   12    8   16    4 |    41   40   40   39   41   40   40   38   40   39    39
  15  |   14   12   11   12   11    5   11   14    9   19    4 |    38   39   34   32   34   33   37   29   33   27    32
  16  |    9   22   10   15   11    5   12   10   10   17    5 |    39   41   41   39   36   39   40   36   38   36    38
  17E |   11   13    7   10   15    4   12   12    7   11    4 |    34   33   34   34   32   33   34   33   35   36    33
  18  |    6   19    9   20    7    4   14   13    8   22    5 |    29   29   31   45   30   33   29   33   36   32    32
  19E |   22   14    9   13   13    4   10   12    9   11    5 |    25   26   26   27   27   26   26   25   26   27    25
  20  |   10   14    9   12    8    5   13   10    7   15    4 |    28   25   29   34   26   30   25   29   31   33    29
  21  |   10   11   10   11   13    4   11   14   10   20    4 |    32   32   31   38   30   34   31   35   36   36    33
  22  |    7    8    9    8   10    3    8    8    8   13    3 |    45   47   46   47   46   46   46   44   43   45    45
  23  |   10   28    9   11   13    6   17   18    8   12    5 |    39   40   34   37   34   36   37   33   37   35    34
  24E |   10   12   10    8   13    5   12   10    8   11    4 |    29   33   32   30   33   31   32   29   34   35    31
  25  |   10   12    9    7    8    2   14   10    6   10    3 |    38   39   38   35   38   37   38   36   41   37    37
  26  |   11   11    6    6   10    3   11    7    7   13    3 |    42   42   42   40   40   41   44   42   44   43    41
  27E |    9   14   11    8   14    3   11    7    9   11    4 |    35   37   37   36   34   35   36   33   37   32    34
  28  |    9   11    9   12   11    3   13   12    9   13    4 |    36   39   36   39   35   38   38   37   41   38    37
  29E |   25   18    6   14   13    6   17   11   10   13    5 |    29   24   25   31   27   26   22   25   30   27    26
  30  |   10   11    8    8   11    3   14    7    6   10    3 |    54   55   53   52   50   53   55   54   56   53    53
  31  |   15   12    6   11   14    3    9   11    7   11    4 |    69   70   67   69   65   70   70   69   73   67    69
  32  |   10    9    7    8    6    3    9   12    8    9    3 |    35   34   34   33   31   34   34   31   33   33    32
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   12   14    9   11   12    4   12   11    8   14      |T   38   37   36   37   34   37   37   35   38   37    37
 WRMS |   11   14    9   11   11    4   12   11    7   15      |NE  36   37   35   37   33   36   37   35   37   37    35
 MEDI |   10   11    9   10   11    4   12   11    8   13      |MD  36   39   35   37   34   35   37   34   37   36    34

Table 3.1976.3   GPS week: 1976   Day: 3   MJD: 58079.000                            

        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   11   10    8    8    4    9    7    9   10    3 |    28   30   29   29   23   27   32   27   26   34    27
   2  |   13   14    8   15   10    5   12   11   10   20    4 |    26   21   22   28   22   23   22   27   26   29    23
   3  |    8   12    8   10    8    3   13    6    8   11    3 |    31   39   32   31   31   31   39   31   28   35    31
  X4E |    1  ---  ---  ---  ---   38  ---  ---  ---  ---    0 |    79  ---  ---  ---  ---   65  ---  ---  ---  ---    79
   5  |    8   10    8   10    6    3   11    9    8   13    3 |    27   23   23   25   22   23   25   21   20   20    21
   6  |   11   10    6   11    8    4    9    8    6   11    3 |    30   30   28   26   24   27   30   28   27   35    27
   7  |   10   17    6   14   17    3   15   10    9   11    4 |    35   40   36   40   30   35   39   37   36   35    35
   8E |    8   13   10    9   21    3   13    9    9   10    4 |    22   20   28   25   27   24   27   23   24   24    22
   9  |    7    9    4    8    8    3   11    7    6    8    2 |    22   25   22   21   18   21   27   25   22   25    21
  10  |    6   11    8    6    8    3   10    9    6   12    3 |    29   34   26   31   29   28   35   32   27   36    29
  11  |   10    9   12   12   12    4    9   13    8    9    4 |    28   26   21   29   28   25   28   24   24   24    23
  12  |   14   19    8   12   14    5   15   11   11   16    4 |    25   25   21   24   24   24   26   26   25   27    23
  13  |    7   12   11   10   13    3   12   10    9   20    4 |    25   30   26   29   26   25   31   25   24   24    24
  14  |   10   11    9   10   10    6   12   11    7   13    3 |    22   23   21   23   20   21   24   24   23   22    20
  15  |    7   14   12   11   15    4   11   11   10   16    4 |    29   37   32   32   26   29   35   27   28   24    28
  16  |    9   24    8   13   14    4   15   11   10   15    5 |    25   22   20   25   22   20   23   21   22   20    20
  17E |   15   11    6   14   19    4   11   14    9   10    4 |    34   30   30   34   33   32   30   34   35   33    31
  18  |    7   19    9   17    7    3   13   10    8   16    4 |    19   15   17   34   19   21   17   27   23   24    20
  19E |   17   15    9   13   16    7   11   13    9    9    4 |    23   22   23   24   26   23   22   22   25   24    22
  20  |   10   13    8   11   10    4   13   10    9   13    3 |    18   17   19   28   19   20   18   23   18   23    19
  21  |   13    9    8   12   12    5   12   11   11   19    4 |    22   20   21   27   24   22   22   27   21   28    21
  22  |    5    6   10   10    8    3    7    8    9   10    3 |    23   22   26   27   22   24   23   25   21   23    23
  23  |    7   29   11   12   13    7   17   18    9   16    5 |    26   26   24   26   22   24   26   23   28   21    22
 X24E |   11   14   10    7   26    4   11    7    9  ---    5 |    30   29   29   27   37   26   29   27   27  ---    27
  25  |   12   12    5    7    7    3   13    7    5    9    3 |    21   25   20   18   19   19   24   20   20   23    19
  26  |    6   10    6    9   11    2   13    7   10   11    3 |    24   25   22   23   20   22   27   23   24   26    22
  27E |    7   19    9    7   18    3   15    8    9    9    4 |    22   28   27   24   20   23   27   25   23   22    22
  28  |    5   12   10   10   13    4   10   13    9   11    4 |    24   25   22   25   23   23   28   25   25   24    22
  29E |   17   22    6   14   27    6   16   11   14   12    5 |    30   26   27   29   34   27   26   27   31   28    26
  30  |   11   14    7    8   16    4   12    7    6    9    3 |    43   48   46   44   43   44   47   46   45   48    44
  31  |   12   13    4   11   20    3   10   10    8    9    4 |    48   49   48   52   42   49   50   51   50   49    48
  32  |    7   11    6    7    7    3   11   10    6   12    3 |    27   32   27   29   24   27   33   26   27   33    27
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   15    8   11   13    4   12   10    9   13      |T   28   27   26   28   25   27   28   27   26   28    27
 WRMS |    9   14    8   10   12    4   12   10    8   13      |NE  25   26   23   26   23   23   27   25   24   26    23
 MEDI |    8   12    8   10   12    4   12   10    9   11      |MD  26   26   26   27   24   24   27   26   25   24    23

Table 3.1976.4   GPS week: 1976   Day: 4   MJD: 58080.000                            

        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  |    7   10   10    7    6    4    8    9    7   10    3 |    21   26   24   22   21   21   26   22   20   26    21
   2  |   12   11    9   11   11    4   11   13    8   16    4 |    21   20   20   23   17   20   20   25   22   24    19
   3  |    6   16    9    9    9    3   15   12   10    8    3 |    27   37   28   26   23   25   38   26   23   27    25
  X4E |    2  ---  ---  ---  ---   28  ---  ---  ---  ---    0 |    71  ---  ---  ---  ---   71  ---  ---  ---  ---    71
   5  |   10   10    9    8    9    3   10    8    7   10    3 |    27   25   25   26   23   24   25   23   25   23    23
   6  |    7    9    7    8    7    3    9    8    5   11    3 |    30   32   29   29   27   29   33   30   29   33    29
   7  |   14   16    6   14   10    3   15   10    9   10    4 |    44   48   45   51   47   46   51   48   47   44    46
   8E |    8   12   10    6    9    2   12    9   10    7    3 |    26   25   29   24   28   24   24   25   24   22    24
   9  |    7   12    5   10   12    4   11    8    8    8    3 |    39   37   38   37   38   36   40   39   34   37    36
  10  |    9   12    8    9    9    2   11   10    8   12    3 |    29   37   24   34   24   28   34   29   30   32    28
  11  |   13   10   14    7   14    4   11   14    9   10    4 |    31   30   21   26   29   23   29   23   24   23    23
  12  |   13   20    9   10    9    3   14   10   10   11    4 |    24   27   22   24   23   22   27   25   25   20    21
  13  |    9   11   11   11   16    5   12   11   11   17    4 |    21   26   20   22   20   20   26   23   21   19    19
  14  |   12   10    9    9   12    5   11   13    8   18    4 |    33   34   32   33   31   33   32   35   34   33    31
  15  |   12   13   10   12   13    4   11   14   11   19    5 |    28   33   27   26   30   25   33   26   27   22    25
  16  |   11   23    9   10   10    4   15   11    9   13    4 |    31   30   29   31   34   29   29   28   30   27    28
  17E |   14   14    6    9   10    3   15   13    7    9    4 |    21   24   22   27   26   23   21   28   26   26    23
  18  |    9   19    8   15    7    4   14   11    7   16    4 |    22   23   21   34   20   23   20   24   24   21    21
  19E |   17   16    8   11   12    3   10   12   10   10    4 |    23   22   22   22   21   21   21   22   26   24    21
  20  |    8   10    9   10    9    3    9    8    8   12    3 |    19   17   17   19   16   17   15   23   17   22    17
  21  |   10   11    9   10   15    4   12   13   10   18    4 |    19   24   19   28   20   23   23   28   24   27    20
  22  |    5   11    9    8    9    3    8   11    8   10    3 |    43   46   46   44   44   44   45   44   42   43    43
  23  |    9   25    9   11   13    7   21   17   10   14    5 |    30   29   27   30   27   28   30   25   30   24    25
  24E |   15   15   12    7   14    4   13    6   10   11    4 |    25   23   26   25   28   23   25   22   24   21    22
  25  |    9   36    7   13    9    4   15    6    9   12    5 |    30   54   31   35   34   31   34   33   31   33    32
  26  |    7   11    5    5    9    2   14    8   10    9    3 |    37   38   35   35   34   35   36   36   37   37    35
  27E |   12   13    9    5   15    4   12    7    7    6    3 |    24   26   27   24   31   24   24   24   24   19    23
  28  |    7   10   12   10   12    2    9   13   10    8    4 |    27   30   26   31   25   28   30   30   35   27    27
  29E |   15   18    5   10   18    5   14   12   13   11    5 |    29   25   26   28   21   25   23   27   29   27    24
  30  |   15   15    8    9    8    3   13   10    7    8    4 |    49   48   47   47   47   47   50   49   49   48    47
  31  |   11   11    4    8   16    5   11   13    8    9    4 |    74   76   73   75   70   75   74   76   76   73    73
  32  |    6   12    6    8    7    4    9   11    8   11    3 |    25   26   24   25   21   24   26   23   25   27    23
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   11   15    9   10   11    4   12   11    9   12      |T   31   32   29   31   29   30   31   30   30   29    29
 WRMS |   10   14    9    9   11    4   12   11    8   11      |NE  27   30   26   29   26   26   29   28   27   27    25
 MEDI |    9   12    9    9   10    4   12   11    9   11      |MD  27   29   26   28   27   25   29   26   26   27    24

Table 3.1976.5   GPS week: 1976   Day: 5   MJD: 58081.000                            

        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  |    7   13    9    6    6    2   10   10    6   11    3 |    21   27   22   20   19   20   26   18   20   25    20
   2  |   16   12   10   13   11    4   11   11   12   18    5 |    17   16   15   20   16   16   17   20   21   20    14
   3  |    7   12    9    7    7    2   12   14    7    9    3 |    22   34   27   23   21   22   34   22   21   29    23
  X4E |    2  ---  ---  ---  ---   28  ---  ---  ---  ---    0 |    97  ---  ---  ---  ---   94  ---  ---  ---  ---    97
   5  |    8   10    9    8    9    3    9    6   10    9    3 |    21   22   21   23   19   20   22   19   21   19    19
   6  |    8    8    7    8    7    3    9    7    8   11    3 |    24   28   24   23   23   25   30   25   26   30    25
   7E |   13   16    8   13   18    5   16   15   11   10    5 |    66   68   67   70   63   65   69   62   65   63    65
   8E |   12   12   10    5   12    3   11    7    8    9    3 |    20   20   22   20   20   20   24   20   20   20    19
   9  |    6   11    5    8   11    3   10    8    6    9    3 |    25   28   26   25   23   25   31   23   25   29    24
  10  |    7   10    8    4   10    3   11   11    7   12    3 |    21   28   20   24   16   21   30   18   21   25    20
  11  |   11    7   10    9   13    5    9   14    7    9    4 |    24   23   16   23   18   18   25   18   21   18    18
  12  |   16   19   10   10   12    4   14   11   12   14    5 |    20   23   18   21   17   20   23   21   23   19    19
  13  |    9   11   10   10   15    3   13   10   10   16    4 |    23   28   21   23   23   21   27   18   21   20    20
  14  |    8    8    9    9   11    4   11   13    6   18    4 |    26   25   24   27   25   25   27   26   26   26    24
  15  |   12   14   12   13   16    4   11   11    9   19    5 |    28   36   31   26   32   26   32   24   26   21    26
  16  |   11   22    9   14   15    7   14   12   12   14    5 |    24   21   21   24   20   20   22   18   19   19    18
  17E |   14   12    7   10   14    3   13   10    8   11    4 |    21   21   17   24   20   19   19   21   22   23    19
  18  |    9   19    9    8    9    3   15   10    9   15    4 |    15   15   16   21   18   16   15   19   21   20    15
  19E |   18   15    7   11   15    4   10   11   10   11    4 |    30   29   29   30   30   29   27   27   30   29    28
  20  |    8   11    9    9    8    3   11    7    7   13    3 |    18   19   20   24   22   19   17   20   21   23    19
  21  |   12   12   10   11   16    4   12   12    9   19    4 |    15   19   13   24   16   18   19   21   19   21    15
  22  |    6    9   10    7    8    2    8   12    7   10    3 |    29   28   30   28   29   27   30   23   24   28    26
  23  |    9   28   10   11   15    6   18   19   10   14    5 |    28   26   23   27   22   25   24   24   26   24    22
  24E |   14   13   13    7   18    4   13    9   10   11    4 |    20   21   25   21   23   19   23   18   19   15    19
  25  |    7   13    7    5    9    5   12    8    7    8    3 |    21   27   21   26   18   22   24   23   22   26    22
  26  |   12   11    6    7   12    3   12   10    9   10    3 |    29   28   25   24   22   25   29   26   23   28    25
  27E |    9   12   11    8   14    3   12    7    7    9    3 |    19   20   22   20   21   18   21   19   19   19    19
  28  |    7   12   11   10   12    3   11   11    7    9    3 |    22   25   21   25   21   22   25   23   24   21    21
  29E |   20   17    7   11   18    5   17   11   11   13    5 |    30   29   30   31   32   29   29   32   33   30    29
  30  |   10   10    8   10   10    3   11    9    8   11    3 |    42   47   46   41   41   44   47   46   42   46    43
  31  |   14   13    5    7   16    4   11   13    8    8    4 |   105  105  103  103  101  102  104  103  102  103   103
  32  |    8    9    6    6    6    3    8   12    5    7    3 |    23   25   22   24   21   22   26   20   21   23    21
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   11   14    9    9   13    4   12   11    9   12      |T   29   29   27   28   26   28   29   26   27   27    28
 WRMS |   10   14    9    9   12    4   12   11    8   13      |NE  22   25   21   23   20   21   25   21   22   23    20
 MEDI |    9   12    9    9   12    3   11   11    8   11      |MD  23   26   22   24   21   22   26   21   22   23    21

Table 3.1976.6   GPS week: 1976   Day: 6   MJD: 58082.000                            

        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    7    6   11    3    8    7    7   13    3 |    21   26   20   21   20   19   24   20   20   26    20
   2  |    9   11   10   11   16    5   13   11   11   15    4 |    23   20   18   21   23   18   19   22   21   20    17
   3  |    6   13    7    7   10    4   13   10    7   17    3 |    20   32   21   21   15   20   32   22   20   29    20
  X4E |    4  ---  ---  ---  ---   33  ---  ---  ---  ---    0 |   122  ---  ---  ---  ---  109  ---  ---  ---  ---   127
   5  |    6   11    9    6   13    5   10   10    7   11    3 |    25   26   27   23   27   23   27   21   24   19    22
   6  |    8    8    7    8   12    4   10    9    5    8    3 |    29   30   30   25   28   25   30   25   28   29    27
   7E |   17   15    7   12   25    3   15   15   12    9    5 |    76   77   77   77   81   76   83   79   76   78    77
   8E |    9   11    9    5   15    3   12    8    8    8    3 |    18   21   23   17   19   17   22   18   17   18    17
   9  |    8   13    6    6   10    4   11    9    8    9    3 |    22   27   24   24   23   22   29   23   24   25    23
  10  |    7   13    7    9   14    4   12   11    6   14    3 |    26   32   21   31   18   25   34   28   25   32    25
  11  |    9    8   10    8   15    4   11   13   10   12    4 |    23   27   17   25   23   22   27   22   23   24    20
  12  |   12   20   10   11   16    3   16   11   11   13    4 |    19   24   17   21   17   18   22   21   22   16    18
  13  |    8   12   10   11   23    4   13   11    8   18    4 |    23   28   22   21   27   20   28   18   19   19    19
  14  |   10   11    8    9   15    4   10   14    8   15    4 |    27   26   23   27   25   25   27   30   29   26    25
  15  |    9   16   12   12   20    3   14   12   10   16    5 |    34   41   35   27   40   29   39   27   29   27    30
  16  |    9   25   10   12   43    7   17   12   11   15    6 |    22   23   20   23   32   21   25   22   26   19    20
  17E |   11   13    6   13   16    3   13   10    6   11    4 |    23   25   23   29   23   25   25   28   27   28    24
 X18  |    8   21    9   13   10    5   13   11   10  ---    5 |    14   16   14   27   12   17   14   18   19  ---    15
  19E |   14   16    8   12   13    5    9   11    7   10    4 |    44   45   40   43   46   41   43   43   45   41    42
  20  |    6   12   10    7   13    3   12    9    9   14    3 |    18   19   18   20   22   17   16   19   17   22    17
  21  |   10   11   11    9   19    5   15   16    9   21    5 |    15   18   15   22   21   16   20   25   17   24    15
  22  |    4    8   10    8    9    4    7    9    9   11    3 |    31   30   32   32   29   30   31   28   26   29    29
  23  |   10   25    9   12   16    7   19   19    9   15    5 |    27   27   21   25   18   25   26   24   25   22    20
  24E |   10   15    9    6   19    3   12    9    8   12    4 |    25   29   25   22   27   22   23   22   20   21    22
  25  |    8   14    7   18   13    3   14    6    7   12    4 |    20   25   21   19   19   20   24   19   21   23    19
  26  |    8   14    5    6   14    5   14   12    8   10    3 |    25   30   24   23   24   23   28   25   26   28    24
  27E |    7   11   10    7   14    3   15    9    5    8    3 |    19   21   23   15   17   16   20   18   18   14    16
  28  |   10   13   13   10   12    3   12   13    7   11    4 |    18   27   21   27   20   22   24   23   26   20    21
  29E |   12   19    6   10   25    4   16   11   12   13    5 |    54   54   54   56   58   53   53   54   54   51    53
  30E |   14   10   10    9   16    3   10   12    6    9    4 |    42   44   43   38   40   42   44   40   42   41    41
  31E |   17   14    7   10   17    7   11   12    9    7    4 |   120  122  120  124  118  122  122  123  122  122   122
 X32  |    7   12    6    6   10    2    9   13    5  ---    3 |    22   28   24   22   22   21   26   19   22  ---    21
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   14    9   10   17    4   13   11    8   13      |T   32   32   29   30   30   31   32   29   30   30    31
 WRMS |    9   14    9    9   15    4   13   11    8   13      |NE  22   26   22   23   22   21   26   22   23   23    21
 MEDI |    9   13    9    9   15    4   12   11    8   12      |MD  23   27   23   24   23   22   27   23   24   25    21



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 4.1976   GPS week: 1976   MJD: 58076.0-58082.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3071 |U    8     9    26 |U   10    11    48 |U   11    12    18 |
emr | emr 2972 |U   14    12    43 |U   14    13    54 |U   17    12    40 |
esa | esa 2976 |     9     8    24 |U   10    11    43 |    10    11    23 |
gfz | gfz 2976 |U    9     7    27 |U   10    10    49 |U    9    10    22 |
grg | grg 2975 |U   10    11    22 |U   10    11    42 |    11    11    24 |
igr | igr 2976 |     8     8    25 |     9    10    48 |    10    10    20 |
igs | igs 2976 |     8     8    23 |    10    10    46 |    10     9    22 |
jpl | jpl 2976 |    12    13    38 |U   12    13    58 |    16    12    37 |
mit | mit 2976 |     9     9    26 |U   12    14    53 |U   12    10    25 |



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 5.1976.0   GPS week: 1976   Day: 0   MJD: 58076.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3072 |     8    10    22 |     7    11    69 |    11    12    17 |
emr | emr 2976 |    17    12    44 |    11    11    67 |    16    11    46 |
esa | esa 2976 |    10     8    22 |     7    12    62 |     9    11    23 |
gfz | gfz 2976 |     9     8    25 |     8    10    70 |     8     9    22 |
grg | grg 2975 |    11    11    19 |     8    12    64 |    10     9    26 |
igr | igr 2976 |     9     9    24 |     7    11    71 |    10    10    21 |
igs | igs 2976 |    10     9    24 |     7    10    68 |    10     8    23 |
jpl | jpl 2976 |    14    13    39 |    10    14    78 |    17    11    39 |
mit | mit 2976 |    11    12    28 |    12    17    70 |    12    10    25 |

Table 5.1976.1   GPS week: 1976   Day: 1   MJD: 58077.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3072 |     8     8    26 |    12    10    54 |     9    11    17 |
emr | emr 2969 |    17    14    39 |    17    15    68 |    21    12    44 |
esa | esa 2976 |    10     7    26 |    12    10    53 |     8    10    20 |
gfz | gfz 2976 |    10     6    29 |    13    11    56 |     7     8    20 |
grg | grg 2976 |    11    10    24 |    14     9    51 |     9     7    26 |
igr | igr 2976 |     8     7    27 |    12    10    56 |     8     9    19 |
igs | igs 2976 |     9     7    25 |    13    10    55 |     8     7    21 |
jpl | jpl 2976 |    13    12    39 |    15    14    67 |    16     9    39 |
mit | mit 2976 |    10     9    26 |    14    14    58 |     9     9    24 |

Table 5.1976.2   GPS week: 1976   Day: 2   MJD: 58078.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3071 |     8     6    29 |    12    12    50 |    11    11    17 |
emr | emr 2976 |    13    10    43 |    18    12    53 |    20    11    42 |
esa | esa 2976 |     9     6    29 |    13     9    45 |     9     9    22 |
gfz | gfz 2976 |     9     8    32 |    10     8    49 |     8     9    21 |
grg | grg 2976 |     8     7    25 |    12     9    42 |    10    10    17 |
igr | igr 2976 |     8     7    30 |    12     9    48 |    10     9    18 |
igs | igs 2976 |     8     7    29 |    12     9    46 |    10     8    20 |
jpl | jpl 2976 |    12    12    46 |    16    14    61 |    17    10    36 |
mit | mit 2976 |    10    10    31 |    13    11    53 |    11     9    22 |

Table 5.1976.3   GPS week: 1976   Day: 3   MJD: 58079.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3072 |     8     7    27 |    11    13    47 |    10    12    21 |
emr | emr 2964 |    14    12    42 |    14    16    52 |    15    13    39 |
esa | esa 2976 |     9     5    22 |    11    11    43 |    10    13    25 |
gfz | gfz 2976 |     9     5    26 |    12    12    50 |     9    12    22 |
grg | grg 2976 |     9     9    24 |    11    13    41 |    12    16    20 |
igr | igr 2976 |     8     6    26 |    10    11    48 |    10    11    21 |
igs | igs 2976 |     8     5    22 |    10    12    46 |    10    10    21 |
jpl | jpl 2976 |    12    12    33 |    11    13    54 |    15    15    38 |
mit | mit 2976 |     8     8    25 |    12    15    49 |    11     9    23 |

Table 5.1976.4   GPS week: 1976   Day: 4   MJD: 58080.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3072 |  ----  ----  ---- |    10    10    41 |    13    12    21 |
emr | emr 2975 |  ----  ----  ---- |    14    14    52 |    18    14    32 |
esa | esa 2976 |  ----  ----  ---- |    10    12    36 |    11    12    24 |
gfz | gfz 2976 |  ----  ----  ---- |    10    12    43 |    10    11    23 |
grg | grg 2976 |  ----  ----  ---- |     8    11    38 |    12    12    29 |
igr | igr 2976 |  ----  ----  ---- |     9    10    40 |    11    10    22 |
igs | igs 2976 |  ----  ----  ---- |     9    10    40 |    11    10    22 |
jpl | jpl 2976 |  ----  ----  ---- |    14    15    56 |    16    15    32 |
mit | mit 2976 |  ----  ----  ---- |    13    16    50 |    16    19    30 |

Table 5.1976.5   GPS week: 1976   Day: 5   MJD: 58081.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3072 |     9     8    31 |     8    10    37 |    13    11    15 |
emr | emr 2974 |    12    11    40 |    11    11    44 |    14    13    38 |
esa | esa 2976 |     9     8    25 |     8    10    32 |    12    11    21 |
gfz | gfz 2976 |     7     7    29 |     8     9    41 |    10    12    23 |
grg | grg 2976 |     9    13    23 |     8     9    30 |    12    15    16 |
igr | igr 2976 |     8     7    29 |     8     8    37 |    11    11    19 |
igs | igs 2976 |     7     7    25 |     8     8    35 |    11    10    19 |
jpl | jpl 2976 |    11    11    39 |    10    11    46 |    17    11    36 |
mit | mit 2976 |     8     8    29 |    12    16    51 |    13    10    27 |

Table 5.1976.6   GPS week: 1976   Day: 6   MJD: 58082.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3069 |     7    13    19 |     8     9    35 |    10    14    22 |
emr | emr 2976 |    12    16    48 |    11    13    43 |    16    12    39 |
esa | esa 2976 |     9    13    19 |     9    11    30 |    10    13    27 |
gfz | gfz 2976 |     9    11    20 |    10    11    37 |     9    12    26 |
grg | grg 2976 |    10    16    18 |     9    11    28 |    10     9    32 |
igr | igr 2976 |     7    11    17 |     9     9    35 |     8    12    25 |
igs | igs 2976 |     7    12    16 |     9     9    33 |    10    11    25 |
jpl | jpl 2976 |    13    17    36 |    11    12    43 |    15    15    37 |
mit | mit 2976 |     7    10    16 |     9    11    40 |     9     9    26 |


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 6.1976   GPS week: 1976   MJD: 58076.500-58082.500

                                                         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      -3      35     -81     -4 |      16     27
            |      14      12      68      59      4 |       2
emr   uuuuu |     -14      19     103      12     14 |      34     44
            |      13      11      96      72     12 |       3
esa   uuuuu |     -11      13     -36      -8      2 |      22     32
            |       9      13      55      32      3 |       3
gfz   uuuuu |     -11       7     -33      35      3 |      22     31
            |      24       7      47     114      4 |       2
grg   uuuuu |      15      20     -33      60      0 |       2     21
            |      34      11      45      60      4 |       1
igr   xxxxx |       8      22      24      49      2 |       5     24
            |      10      18      72      56      3 |       3
irf   xxxxx |       8      -5       3      20     -3 |       3     23
            |       8      15      31      26      3 |       2
jpl   xxxxx |      21      -4       8     111     18 |      18     32
            |      13      25      60      58     12 |       8
mit   uuuuu |      26     -12      -4      59     -1 |      20     30
            |      17      19      81      49      4 |       2
ngs   uuuuu |       6     -42      83       8     -4 |      15     29
            |      26      23     112      52      4 |       2
sio   uuuux |       9      21    -131     -74     -3 |      39     45
            |      20      17      42      66      4 |       2


Table 7.1976.0   GPS week: 1976   Day: 0   MJD: 58076.500

                                                         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 |     -31      -3     156     -27     -5 |      17     28
emr   uuuuu |      -2      29      21      93      2 |      29     40
esa   uuuuu |     -15       9      24      -2      3 |      19     31
gfz   uuuuu |     -14      -4       1     -22      1 |      19     29
grg   uuuuu |      45      28     -28     127      1 |       1     20
igr   xxxxx |      17      49     -29      90      5 |       1     26
irf   xxxxx |       7      10     -22      34     -2 |       0     25
jpl   xxxxx |      28      24      88     122     22 |       6     27
mit   uuuuu |      18      -6     -71      73     -3 |      19     29
ngs   uuuuu |      14     -39     -63     -72      0 |      14     30
sio   uuuux |       9      20     -96     -86     -6 |      38     45

Table 7.1976.1   GPS week: 1976   Day: 1   MJD: 58077.500

                                                         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 |     -26     -21      -4     -31     -5 |      17     28
emr   uuuuu |     -28      18     266      16     13 |      32     41
esa   uuuuu |      -7     -12      28      11      3 |      20     31
gfz   uuuuu |      -5      10      -8     -99      5 |      19     29
grg   uuuuu |      14      26     -52      75     -3 |       2     20
igr   xxxxx |      16      33     -32      34      8 |       2     26
irf   xxxxx |      17      19     -24      22      0 |       1     24
jpl   xxxxx |      39      28      85     149     16 |      12     27
mit   uuuuu |      42      10     -48      44      1 |      19     29
ngs   uuuuu |      -7     -31      -2      34     -4 |      15     30
sio   uuuux |      31      39    -158     -28     -6 |      38     44

Table 7.1976.2   GPS week: 1976   Day: 2   MJD: 58078.500

                                                         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 |     -29     -14      11    -118    -11 |      17     28
emr   uuuuu |     -24       3      90     -40     33 |      31     41
esa   uuuuu |     -20      29     -96     -31      6 |      21     30
gfz   uuuuu |     -31      18     -64       8      4 |      20     29
grg   uuuuu |      23      35     -41      72     -6 |       1     21
igr   xxxxx |      -9      16      78      29      1 |       4     22
irf   xxxxx |      18      -9     -28      47      2 |       2     22
jpl   xxxxx |      31     -19     -21     109     27 |      14     25
mit   uuuuu |      51       9     -74     106      5 |      19     29
ngs   uuuuu |       6     -73     261      11     -7 |      15     29
sio   uuuux |      25      29    -205     -27      2 |      38     44

Table 7.1976.3   GPS week: 1976   Day: 3   MJD: 58079.500

                                                         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 |     -24      -2      -9     -97     -3 |      18     29
emr   uuuuu |      -2      15     126      77     13 |      36     46
esa   uuuuu |      -9      24     -96      34      3 |      25     33
gfz   uuuuu |     -20       6      14      93      9 |      23     31
grg   uuuuu |      16      18      14      15     -1 |       3     21
igr   xxxxx |      18      28      46     134      3 |       8     22
irf   xxxxx |       5     -15      30      13     -3 |       5     22
jpl   xxxxx |       1     -11      -9      74     30 |      19     30
mit   uuuuu |      11     -13      47      33      1 |      23     31
ngs   uuuuu |      32     -65      53      16    -12 |      18     29
sio   uuuux |     -11      45     -87    -174     -2 |      41     47

Table 7.1976.4   GPS week: 1976   Day: 4   MJD: 58080.500

                                                         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 |      -8      14      96      -6      1 |      16     26
emr   uuuuu |     -11      36      10      78      0 |      38     49
esa   uuuuu |     -14      13     -56      18     -3 |      25     34
gfz   uuuuu |     -31      11     -61      18      5 |      25     33
grg   uuuuu |      41      25    -103      80      4 |       3     21
igr   xxxxx |       0      20     -54     -37      1 |       8     23
irf   xxxxx |      -5     -24      51      -9     -7 |       5     22
jpl   xxxxx |      13     -10     -79      67     26 |      23     37
mit   uuuuu |       1     -41     151      22     -5 |      23     32
ngs   uuuuu |      39     -46      75     -35     -5 |      17     29
sio   uuuux |     -24      10    -117    -152      4 |      41     47

Table 7.1976.5   GPS week: 1976   Day: 5   MJD: 58081.500

                                                         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 |     -13       5      29    -151     -3 |      15     25
emr   uuuuu |     -31      19      23     -64     17 |      37     48
esa   uuuuu |     -19      17       8     -45     -1 |      24     33
gfz   uuuuu |      39       3       1     259     -2 |      25     33
grg   uuuuu |      21       7     -54     -51      4 |       3     21
igr   xxxxx |      11      17      11      20     -3 |       8     23
irf   xxxxx |       5       3      17     -15     -5 |       4     22
jpl   xxxxx |      10       3      15      40      0 |      27     39
mit   uuuuu |      29     -13      -1      -1     -3 |      22     31
ngs   uuuuu |     -38     -31      60       6     -3 |      16     28
sio   uuuux |      24       7    -105     -36     -5 |      40     46

Table 7.1976.6   GPS week: 1976   Day: 6   MJD: 58082.500

                                                         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 |       7       3     -35    -139     -2 |      11     25
emr   uuuuu |      -1      14     184     -74     24 |      33     46
esa   uuuuu |       6      12     -65     -44      0 |      20     32
gfz   uuuuu |     -13       3    -113      -9     -2 |      21     33
grg   uuuuu |     -58       4      31     103      0 |      -1     23
igr   xxxxx |       2      -9     151      76      3 |       4     25
irf   xxxxx |       9     -15       1      51     -3 |       0     25
jpl   xxxxx |      25     -44     -21     213      4 |      27     39
mit   uuuuu |      31     -31     -32     137     -6 |      18     31
ngs   uuuuu |      -3      -5     201      94      1 |      12     28
sio   uuuux |       7      -2    -146     -12     -4 |      35     43


More information about the IGSREPORT mailing list