[IGSREPORT-19925] Wk 1641 IGS Final Orbits

Jim Ray igs.acc at noaa.gov
Fri Jul 8 04:32:57 PDT 2011


Author:  AC Coordinator / NOAA NGS

sum-file Version 2.0
Final IGS Orbit Combination - Week 1641   (Jun 19, 2011 - Jun 25, 2011)

Contacts: J. Ray       (jim.ray at noaa.gov),
          J. Griffiths (jake.griffiths at noaa.gov)


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. 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, no satellite L1/L2 delay calibration should be
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. 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 3 weeks (21 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:

igs1641[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1641[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1641[0-6].cls  IGS GPS clock combination summary report.
igs16417.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs16417.sum      Complete report.

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

 1. The centres used in the clock combination are COD, EMR, ESA, GFZ, MIT, and
    JPL. The other centres are excluded because of poorer consistency (GRG),
    they provide broadcast clocks (NGS), or clock corrections are not provided
    (SIO).  The clock information not used is still compared to combination for
    completeness.  
    The value of 999999.999999 microseconds, according to the sp3 format 
    convention, is used to signify that no clock solution is available and 
    therefore must not be used.

 2. Rapid (IGR) orbits/clocks are included in the combination for statistics only.
    Starting week 1582, a new solution from CNES/GRGS (GRG) is included with
    weight except for the clock and LOD combinations.

 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  |  EMR   | 30
                0  |  ESA   | IRKJ UNSA
                0  |  GFZ   | 12 16 25 29 30 31 MDVJ SCUB
                0  |  GRG   | AMC2
                0  |  JPL   | 25
                0  |  MIT   | 28 30 MAW1
                1  |  COD   | 30 30 WILL
                1  |  ESA   | 30 30 BJFS IRKJ UNSA
                1  |  GFZ   | 12 16 25 28 30 MATE MDVJ
                1  |  GRG   | AMC2 IRKJ NRC1
                1  |  JPL   | 25
                1  |  MIT   | GRAZ HARB SPT0
                2  |  COD   | AREQ
                2  |  EMR   | 30 30
                2  |  ESA   | MAW1 IRKJ MAW1
                2  |  GFZ   | 12 16 25 28 30 31 DAV1 FAA1 MDVJ
                2  |  GRG   | IRKJ SANT USN3
                2  |  JPL   | 15 25 COCO REUN
                2  |  MIT   | BJFS SFER
                3  |  COD   | 4 YELL YELL
                3  |  EMR   | AREQ
                3  |  ESA   | IRKJ UNSA
                3  |  GFZ   | 12 16 28 30 31 AREQ COCO MDVJ
                3  |  JPL   | 25 COCO
                3  |  MIT   | 30 30 CAS1 CAS1 GRAZ MAW1 YELL
                4  |  COD   | NRIL
                4  |  EMR   | 30 30
                4  |  ESA   | MATE TIXI
                4  |  GFZ   | 16 28 30 31 MATE
                4  |  GRG   | KIT3 NKLG
                4  |  JPL   | 25
                4  |  MIT   | TIXI TIXI
                5  |  EMR   | 30 YELL
                5  |  ESA   | 21 21 NRC1 NRC1 UNSA
                5  |  GFZ   | 12 21 28 30 FAA1 MDVJ
                5  |  GRG   | NRC1
                5  |  JPL   | 21 25 HARB
                6  |  EMR   | 30 30 HARB
                6  |  ESA   | IRKJ NKLG UNSA
                6  |  GFZ   | 12 28 30 31 MDVJ
                6  |  GRG   | IRKJ
                6  |  JPL   | 25
                6  |  MIT   | 30 30 MIZU

 5. 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.
    

 6. Small rotations were applied to all the AC orbit and ERP values in order
    to align them to the IGS05 frame. These rotations were estimated in the IGS
    SINEX combination process, performed by the IGS Reference Frame Coordinator
    at the Institut Geographique National (IGN), and are based on the common
    stations between the individual AC SINEX solutions and the IGS05.snx SINEX
    frame. 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 |   [mm]   [mm]   [mm]   [uas]  [uas]  [uas]   [ppb]
     -------+---------------------------------------------------
       COD  |    -.6     .2     .0     -26      0    -13     .11
       EMR  |    3.2   -2.4    4.0      -4      5     -3     .18
       ESA  |    2.4   -5.9    8.1     -42   -117     43     .09
       GFZ  |   -2.9     .3    -.9      -4     36      7     .02
       GRG  |    3.0   -3.9   16.2     -14     19    -31     .03
       JPL  |    1.7   -6.1    2.9      28     89     62   -1.13
       MIT  |    4.4   -6.3   16.2     -17      0    -14     .10
       NGS  |    4.0   -6.9   15.0     -57      7      4     .06
       SIO  |    3.3   -5.2   -4.0     -98   -123     29     .01


 7. 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 navigation solution is still based on the SP3 clocks but this will soon
    adopt the clock RINEX files as well.

 8. Starting on 27-Feb-2000 (GPS Week 1051-0; MJD 51601) the IGS final products
    are aligned to the IGS reference frame products (station coordinates and
    ERPs as generated by IGN). For more information see IGSMAIL #2750.
    Because of this change in alignment Table 2 has been enhanced with one 
    additional line per AC. This additional line shows the X- and Y-rotations 
    which were applied to each of the AC orbits prior to the orbit combination. 
    These rotations are based on the difference between the individual AC ERP 
    estimates and the IGS reference frame ERP product. The total rotation of
    the individual AC orbits w.r.t. the IGS combined orbit is the sum of the
    values in the two lines of Table 2 plus the reference frame rotation.

 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 does not yet use IGS08/igs08.atx, which causes their RMS
    clock residuals to be higher than for the other centres; for the same
    reason, the JPL solution is excluded from the weekly SINEX combination.

    
ORBIT COMBINATION AND EVALUATION STATISTICS:                                    
--------------------------------------------                                    
      
Most combination statistics are with respect to the combined orbits and
consist of five 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 1.1641.a). It also displays the computed satellite
position sigmas for the combined orbits (table 1.1641.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 2.1641.[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 3.1641.[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 and final
part, Table 5, is similar to Table 4 and contains daily precise navigation
statistics (tables 5.1641.0-6).

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 1641 summary.                       (Jun 19, 2011 - Jun 25, 2011)

Table 1.1641.a   GPS week: 1641   MJD: 55731.000-55737.000

         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  250|    0     0    -2     2   -28    -8  -.20    8    8 |    -155    -533     17     96
        |    0     0     0     7    22     9   .01           |     544     833
emr   95|    0     0    -3   -52    12   -13   .38   18   18 |    2070    -664     14    107
        |    1     1     2    22    24    16   .02           |     793     848
esa  142|    0     0     1    11   132    -8   .28    7    7 |    -300    -846     15    148
        |    0     0     1    18    34     8   .03           |    1370    1161
gfz  195|   -1     0    -1   -43  -138    21  -.13   12   13 |     113     138     23    141
        |    1     0     1    50    85     9   .03           |     258     635
grg  134|    2     1     8   -45   -41   -12   .57   14   13 |     138    -446     41    276
        |    1     0     1    18    15    12   .05           |     298     622
igr  n/a|    0     0     0   -15   -12   -36  -.08    5    5 |   21511   -1069     20    128
        |    0     0     0     7    26    14   .02           |    1416     738
jpl  138|   -1     0    -3  -103  -185    10   .51   18   17 |    1361    -975     21    343
        |    2     0     1    27    33    23   .03           |    1273     840
mit  264|    0     0     0   -22   -27   -16  -.35   10    9 |     306    -501     19    174
        |    0     0     0    34    33    16   .01           |     940    1027
ngs  225|    0     0     2    70   -11     2  -.19   10    8 |    -157    -556   2242   3965
        |    0     0     1    26    43    16   .03           |     544     866
sio  251|   -1     1    -2   163   231    56  -.39   18   17 |     ---     ---    ---    ---
        |    1     0     1    39    40    11   .04           |     ---     ---


Table 1.1641.b   GPS week : 1641   MJD: 55731.000-55737.000   

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



Table 2: Daily transformation of each centre to the combined IGS orbit and
         clocks for each day of the week. The transformation displayed is the
         sum of a priori and estimated transformations.
         WRMS - RMS weighted by the centres SP3 header accuracy codes.
         STA  - Number of stations in the daily solutions.
   
Table 2.1641.0   GPS week: 1641   Day: 0   MJD: 55731.000                            

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  250|    0     0    -3     5   -22     3  -.19   10    9 |    -298    -828     17     96
        |                     -3     1                       |
emr   95|    0     0    -4   -15    42   -10   .34   19   19 |    2384    -199     16    115
        |                    -12   -98                       |
esa  142|    0     0     3    36   121    -9   .26    7    7 |    -424   -1645     15    132
        |                     21    15                       |
gfz  195|    0     0    -1  -111   -69    15  -.14   11   12 |     -28     994     23    141
        |                      4   114                       |
grg  134|    1     1     7   -54   -53   -22   .55   14   13 |     194    -588     36    299
        |                     76   -20                       |
igr  n/a|    0     0    -2   -21   -18   -30  -.08    5    5 |   23102    -850     20    121
        |                     53    22                       |
jpl  138|    0     0    -4   -90  -169    -4   .51   18   16 |    2745    -761     20    344
        |                     57   115                       |
mit  277|    0     0     0   -29   -33   -35  -.37   10   10 |    -377      48     20    192
        |                     -8    16                       |
ngs  225|    0    -1     2    77   -36    15  -.21    9    8 |    -319    -774   2210   3892
        |                    -25   -46                       |
sio  251|   -4     0    -4   148   234    64  -.42   20   19 |     ---     ---    ---    ---
        |                   -101  -162                       |

Table 2.1641.1   GPS week: 1641   Day: 1   MJD: 55732.000                            

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  250|    0     0    -2    -7   -22   -10  -.23    8    8 |     308    -386     16    111
        |                     61     0                       |
emr   95|   -2    -1    -5   -69    34    -8   .38   18   18 |    2769      95     15    126
        |                     13   -69                       |
esa  142|    1     0     2    12   113   -13   .29    7    7 |    1501    -921     13    217
        |                      5    28                       |
gfz  195|    0     0     0    30  -154    21  -.13   13   13 |     326     -66     24    153
        |                    -43    92                       |
grg  134|    1     1     8   -77   -41   -25   .53   14   12 |     -87     198     47    284
        |                    114   -55                       |
igr  n/a|    0     0     0    -8     0   -50  -.08    5    4 |   22925    -558     22    154
        |                     34    11                       |
jpl  138|   -2     0    -4  -101  -173    35   .50   18   16 |    2429    -403     22    343
        |                     64   -87                       |
mit  277|    0     0     0   -14   -54   -33  -.35   10   10 |    1049    -848     16    171
        |                      3    11                       |
ngs  225|    0    -1     3    38    29     2  -.22   11    9 |     323    -427   2465   3981
        |                     -2   -51                       |
sio  251|   -3     0    -3   191   202    65  -.44   18   18 |     ---     ---    ---    ---
        |                    -95  -140                       |

Table 2.1641.2   GPS week: 1641   Day: 2   MJD: 55733.000                            

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  250|    0    -1    -2     8   -36    -9  -.18    8    7 |      -2   -1497     17     95
        |                    -21    18                       |
emr   95|   -1    -1    -5   -71    -1     0   .42   18   18 |    2985   -1075     13     95
        |                     20   -39                       |
esa  142|    1     0     2    28    98   -18   .33    8    8 |   -2377     396     16    146
        |                     30    34                       |
gfz  195|   -2     0     0    -7  -112    32  -.08   13   12 |     155     111     22    143
        |                    -51   100                       |
grg  134|    3     1     7   -21   -44     0   .51   16   14 |      70      79     48    271
        |                     56   -44                       |
igr  n/a|    0     0     0   -18   -11   -17  -.06    5    5 |   22637   -1574     18    106
        |                      0    24                       |
jpl  138|   -3     0    -5   -81  -205    -2   .54   19   18 |    2275   -1212     21    342
        |                      9   -44                       |
mit  277|    1     0     1   -61    -3    -1  -.33    9    8 |     -84    -697     20    154
        |                     -9     3                       |
ngs  225|    0     0     3    50   -11   -26  -.19   11    9 |     122   -1706   2077   3975
        |                     18   -67                       |
sio  251|   -2     2    -1   112   252    63  -.36   17   16 |     ---     ---    ---    ---
        |                    -98  -145                       |

Table 2.1641.3   GPS week: 1641   Day: 3   MJD: 55734.000                            

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  250|    0    -1    -2    -8   -14   -21  -.18    8    7 |    -479    -194     19     98
        |                     78   -54                       |
emr   95|   -1    -2    -4   -70     2    -6   .38   17   17 |    2101   -1036     15    106
        |                     30   -53                       |
esa  142|    2     0     0   -10   127    -6   .26    7    7 |     297   -1214     15    134
        |                     17     1                       |
gfz  195|   -2     0     1   -13  -158    25  -.16   12   14 |     344    -515     24    139
        |                      4   101                       |
grg  134|    2     2     8   -47   -16   -16   .53   14   12 |     617   -1306     45    272
        |                     86   -33                       |
igr  n/a|    0     0     0   -11     4   -36  -.10    5    5 |   21363   -1297     21    129
        |                      2     3                       |
jpl  138|   -3     0    -4  -159  -193    17   .51   19   17 |    1599   -1328     21    341
        |                     55   -61                       |
mit  277|    0     0     0    43   -36     5  -.34   11   10 |    -247     380     19    166
        |                    -13    -2                       |
ngs  225|    0     0     1    40    -8    -2  -.19   10    8 |    -497    -199   2184   3837
        |                     36     0                       |
sio  251|   -2     0    -2   234   218    53  -.39   17   19 |     ---     ---    ---    ---
        |                   -125  -145                       |

Table 2.1641.4   GPS week: 1641   Day: 4   MJD: 55735.000                            

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  250|    0     0    -3     7    -7   -18  -.20    7    7 |     524    -979     18     97
        |                    -32     2                       |
emr   95|    0     0    -1   -27    14   -47   .37   17   17 |    1783   -2118     15    107
        |                     -5   -44                       |
esa  142|    0     0     0    12   114   -12   .27    7    7 |     945   -2767     18    147
        |                     15    12                       |
gfz  195|   -1     0    -1   -83  -219    29  -.11   12   11 |      52       5     25    142
        |                     -5    83                       |
grg  134|    2     1    10   -24   -30     5   .60   13   12 |     235    -689     37    270
        |                     55   -45                       |
igr  n/a|    0     0    -1    -4    16   -49  -.10    5    5 |   20782   -2294     21    125
        |                    -22   -10                       |
jpl  138|   -1     1    -2   -80  -164   -18   .51   18   16 |     959   -2558     21    338
        |                    -10   -34                       |
mit  277|    0     0     1   -50   -24    -6  -.36   10    9 |    2141   -2557     23    168
        |                     12     9                       |
ngs  225|    0    -1     1   105    18    24  -.20    9    8 |     445    -937   2056   3867
        |                    -78  -106                       |
sio  251|    0     2    -1   137   243    63  -.37   17   16 |     ---     ---    ---    ---
        |                   -101  -136                       |

Table 2.1641.5   GPS week: 1641   Day: 5   MJD: 55736.000                            

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  250|    0     0    -1     7   -20     0  -.19    8    8 |     -20    -942     15     92
        |                     45   -50                       |
emr   95|    0    -1     0   -51    23    -1   .40   17   17 |     572     385     12     93
        |                     10   -62                       |
esa  142|    0     0     1   -15   201    -8   .24    8    8 |   -1636     465     16    132
        |                     43    14                       |
gfz  195|    0     0    -2   -81  -253    20  -.15   13   13 |     317    -551     24    143
        |                     33   120                       |
grg  134|    4     0     6   -46   -43   -22   .65   14   13 |     273   -1047     42    266
        |                     57   -48                       |
igr  n/a|    0     0     0   -19    -9   -17  -.10    5    5 |   19435      -8     19    125
        |                     11    19                       |
jpl  138|    2     1    -2  -104  -144     1   .53   18   16 |    -737      50     20    352
        |                     53    75                       |
mit  277|    0     0     0   -10   -71   -17  -.36   10    9 |    -232    -232     21    177
        |                     -4     2                       |
ngs  225|    0    -2     0    92    23    -5  -.14   10    9 |     -40    -936   2227   3868
        |                   -105   -74                       |
sio  251|   -1     2    -3   161   172    54  -.40   17   15 |     ---     ---    ---    ---
        |                   -109  -126                       |

Table 2.1641.6   GPS week: 1641   Day: 6   MJD: 55737.000                            

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  250|    0    -1    -1     5   -75     0  -.19    9    8 |   -1121    1094     18     89
        |                     13    55                       |
emr   95|    1     1    -4   -62   -31   -22   .38   17   17 |    1898    -704     13    113
        |                     -2   -27                       |
esa  142|    0     0     0    13   150     9   .29    8    8 |    -408    -238     17    129
        |                     16    30                       |
gfz  195|    0     0    -3   -36    -3     3  -.16   12   13 |    -373     992     22    128
        |                    -16   124                       |
grg  134|    1     0     9   -45   -64    -7   .64   14   14 |    -330     231     35    275
        |                     47   -13                       |
igr  n/a|    0     0     0   -24   -66   -49  -.07    5    5 |   20338    -906     20    138
        |                     24    59                       |
jpl  138|   -4     0    -1  -108  -245    45   .44   19   17 |     259    -619     24    345
        |                      1   -30                       |
mit  277|    0     0     0   -37    31   -27  -.36    9    8 |    -106     395     19    195
        |                      5    -9                       |
ngs  225|    1     0     3    85   -93    11  -.16   11    9 |   -1133    1086   2481   4339
        |                    -28   -44                       |
sio  251|    1     2    -3   159   299    32  -.32   19   17 |     ---     ---    ---    ---
        |                   -122  -146                       |

       
       
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 3.1641.0   GPS week: 1641   Day: 0   MJD: 55731.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    3  ---  ---  ---  ---   98  ---  ---  ---  ---    0 |    52  ---  ---  ---  ---   55  ---  ---  ---  ---    53
   2  |    7   13    5   10   10    5   12    8    8   23    3 |    29   32   33   35   33   31   31   33   31   25    30
   3  |    6   15    5    7    7    4   12    9    6   21    3 |    11   18   12   11   17   11   17   12   13   20    11
   4  |    8   11    8    8   10    5   11    9    8   24    3 |    26   29   34   33   34   31   29   34   33   30    29
   5  |    8   24    5   12   17    7   20   12    9   16    4 |    17   31   15   21   25   15   27   17   16   20    15
   6  |    6   13    7    7    7    4   13    7    7   19    3 |    17   21   21   17   23   18   21   17   19   20    18
   7  |    7   17    8   12   18    6   18   10    9   36    5 |    17   27   21   22   29   17   25   18   21   34    17
   8  |    8   17    7    7   12    5   12   10   10   16    3 |    15   23   19   17   23   16   24   17   22   16    17
   9  |   11   13    6    7    9    4   10    8   11   14    3 |    18   22   19   17   22   16   21   15   17   15    16
  10  |   10   13    5   12   10    7    9    9    8   15    3 |    17   27   22   20   30   17   26   23   24   27    20
  11  |   15   14    5    8    7    5   13   11    5   18    3 |    42   43   47   44   50   43   42   45   43   38    43
  12E |    9   16    8   12   17    6   26   12    8   14    4 |    16   25   24   22   27   24   26   24   24   23    20
  13  |    8   22   13    9   20    4   19   10   10   15    4 |    17   33   24   19   35   20   28   20   23   21    20
  14  |    7   20    6   15   15    3   16    6   10   16    4 |    16   27   23   18   29   17   27   16   19   17    18
  15  |   14   17    7   15   17    7   19    9    7   35    5 |    63   70   61   63   70   62   65   67   64   60    63
  16E |    8   23    9   10   15    8   27   17    8   16    5 |    20   26   24   21   31   24   25   19   23   18    19
  17  |    9   18    7   10   13    5   21    8   11   16    4 |    19   29   22   16   34   18   33   16   21   15    19
  18  |    8   23    6    9   13    5   18    9    9   19    4 |    20   34   20   15   32   18   32   16   18   19    18
  19  |    7   21    7    8    9    4   22   11    9   21    4 |    19   30   19   16   27   17   31   21   17   25    18
  20  |    8   19    8   13   14    4   18    6   13   13    4 |    18   20   14   14   22   15   21   15   21   20    14
  21  |   16   11    9    8    7    4   12    9   10   29    4 |    35   37   36   32   33   31   35   31   30   33    32
  22  |    9   18    6    9   16    5   13   10    8   14    3 |    15   29   18   14   33   14   26   14   17   17    16
  23  |    8   28    8   11   12    5   26   10    8   17    4 |    33   41   41   44   42   40   37   36   40   35    37
  24  |   12   16    7   15   11    8   13    6    8   17    4 |    31   27   37   33   32   31   26   27   29   28    30
  25E |   16   28    8   13   21   10   24   14   13   19    5 |    18   33   21   20   27   23   28   21   19   21    17
  26  |   13   20    5   12   14    4   12   12    8   12    4 |    17   25   17   20   20   17   22   24   23   28    17
  27  |    8   13    7    9   11    3   10    9    9   15    3 |    16   22   17   17   21   15   20   15   19   16    15
  28E |    9   16    8   10   17    4   20    6   10   16    4 |    18   24   22   17   20   18   24   17   24   17    18
  29  |   10   22    9   11   13    6   24    8    7   27    4 |    24   38   28   24   35   22   37   19   22   22    24
 X30E |   17   22   12   21   18   13  ---   23  ---  ---    8 |    41   57   45   41   35   43  ---   49  ---  ---    44
  31  |    6   20    7   22   16    5   20   13    9   18    5 |    12   29   19   21   32   13   26   15   16   16    14
  32  |   11   21    7   11   11    3   20    8   13   15    4 |    16   20   15   15   19   15   24   14   19   16    14
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   19    7   11   14    5   18   10    9   20      |T   23   30   25   23   30   23   28   23   24   23    23
 WRMS |    9   19    7   12   13    5   16   10    8   19      |NE  20   28   23   21   28   19   27   20   22   22    20
 MEDI |    8   18    7   10   13    5   18    9    9   16      |MD  18   29   22   20   30   18   26   19   21   20    18

Table 3.1641.1   GPS week: 1641   Day: 1   MJD: 55732.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    4  ---  ---  ---  ---   84  ---  ---  ---  ---    0 |    42  ---  ---  ---  ---   62  ---  ---  ---  ---    43
   2  |    8   11    5   15   11    4   12   10   10   21    3 |    13   17   18   16   16   14   20   19   17   13    14
   3  |    5   14    6   12   11    4    8    8    9   20    3 |    13   21   18   13   17   14   21   12   15   20    14
   4  |    8   13    5   12    8    4   11   13   13   22    4 |    15   24   23   23   22   20   24   26   23   25    19
   5  |    7   20    7   15   15    5   18   10    9   17    4 |    16   26   17   17   22   14   26   21   20   20    15
   6  |    7   13    5   10    9    3   10    7    9   17    3 |    18   26   24   16   24   18   26   18   18   23    19
   7  |    6   16    6   11   18    5   17    7   13   32    4 |    17   30   21   21   29   17   29   17   19   33    18
   8  |    6   15    7   14   14    4   12    9   13   12    3 |    16   25   21   13   22   16   27   19   19   18    17
   9  |    9   15    3   14   10    4   11    9   10   12    3 |    21   21   20   18   24   19   25   20   21   20    19
  10  |    8   12    4   11   12    5   10   13   10   16    3 |    15   24   21   18   21   14   28   23   17   24    17
  11  |   11   13    7   12    7    4   13    9    9   17    3 |    25   30   31   29   31   26   34   28   25   24    26
  12E |    8   16    9   13   13    4   27   11   10   11    4 |    15   22   21   18   25   15   27   22   19   19    17
  13  |    6   25    7   11   21    3   22   11   11   15    4 |    17   33   22   19   33   16   32   17   20   20    18
  14  |    7   18    7   14   16    3   16    7   11   16    4 |    13   26   21   14   27   15   23   13   14   18    16
  15E |    5   18    7   14   17    4   20   10    6   13    4 |    23   36   28   30   33   27   38   31   28   31    27
  16E |    6   24    7   13   10    5   24   13   10   14    4 |    15   28   20   19   21   19   26   18   20   18    17
  17  |    8   22    7   15   15    6   23    9    9   18    4 |    18   32   24   20   34   18   36   17   19   17    20
  18  |    7   23    7   10   14    5   19   10   10   17    4 |    19   34   22   20   30   17   32   21   22   20    20
  19  |    7   20    7    9   10    3   21   14    8   24    4 |    15   29   20   14   21   16   30   17   17   20    16
  20  |    7   20    5   16   14    3   19    7   11   12    4 |    14   23   13   16   18   13   24   14   16   18    12
  21  |    7   11    7    8    8    3   11   10   13   28    4 |    18   28   24   20   24   20   28   21   25   22    21
  22  |    7   21    8    9   16    4   15   11   11   13    4 |    13   29   19   13   29   14   27   17   18   14    15
  23  |    5   25    7   14   17    6   27   10   15   18    5 |    27   38   32   30   35   29   33   29   31   34    29
  24  |    9   14    7   17   11    6   11    7   11   15    3 |    19   18   23   26   17   18   20   17   14   20    18
  25E |   10   24   10   13   16    7   21   19   13   12    5 |    16   30   22   21   19   16   29   22   20   17    16
  26  |    9   17    6   15   17    3   14   12    6   15    4 |    14   24   16   19   18   14   26   23   17   25    15
 X27  |    7   14    4   13   13    4  ---    7    9   13    3 |    15   17   16   15   22   14  ---   14   17   16    14
  28E |    7   16    9   14   14    5   20    8   11   13    4 |    16   24   22   14   23   14   24   18   12   14    16
  29  |    8   23    8   11   10    6   21    7    9   24    4 |    19   33   23   23   28   21   33   19   22   21    21
 X30E |   17   22   11   16   12   10  ---   15  ---  ---    6 |    37   56   47   43   29   40  ---   40  ---  ---    41
  31  |    6   19    8   14   18    6   19   11   14   17    4 |    13   31   20   23   32   16   28   10   19   15    16
  32  |   10   19    5   12   10    3   19    9   11   13    4 |    13   22   16   14   18   12   24   15   16   15    14
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   18    7   13   14    5   18   10   11   18      |T   18   27   22   19   24   19   27   19   19   20    19
 WRMS |    8   18    7   13   12    4   16   10    9   18      |NE  16   25   20   18   24   16   27   18   18   20    17
 MEDI |    7   18    7   13   13    4   18   10   10   16      |MD  16   26   21   19   24   16   27   19   19   20    17

Table 3.1641.2   GPS week: 1641   Day: 2   MJD: 55733.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    4  ---  ---  ---  ---   44  ---  ---  ---  ---    0 |    34  ---  ---  ---  ---   84  ---  ---  ---  ---    34
   2  |    7   14    8   10   10    4   16    9    9   22    4 |    21   22   24   23   24   22   29   25   27   19    21
   3  |    6   13    6    9   11    3   13    5   10   19    3 |    11   16   14   10   18   11   19    9   15   18    11
   4  |    5   13    5    8   12    4    9   13   17   23    4 |    25   25   30   27   30   26   30   31   32   27    26
   5  |    7   18    7   12   15    6   20    8   11   13    4 |    15   24   18   17   23   13   28   18   17   18    14
   6  |    5   12    6    9    9    2   12    8    9   15    3 |    14   19   18   15   23   14   24   13   19   18    15
   7  |    7   19   11   12   21    5   20    9    7   32    5 |    15   26   22   19   28   15   29   17   22   37    17
   8  |    7   14    9    9   15    4   11    9    9   10    3 |    15   20   21   16   22   15   26   20   20   16    17
   9  |    6   15    7   10   15    4   13    9   11   13    3 |    20   25   20   21   25   18   31   22   21   18    19
  10  |    8   15    6   11   14    6    9   10   10   14    3 |    18   27   23   16   25   17   28   23   27   23    20
  11  |    9   11    7   13    9    3   16    6   10   14    3 |    29   34   37   32   38   30   33   33   37   28    32
  12E |   10   19    7   14   17    5   27   10   11   13    4 |    15   25   21   21   21   18   29   24   19   23    18
  13  |    7   23    8   13   24    4   24   11   12   12    4 |    17   29   22   15   31   15   31   17   21   18    17
  14  |    5   15    4   15   20    3   23    6   10   15    4 |    13   24   21   18   31   14   29   13   15   16    15
  15E |    7   16    7   16   15    4   18    7    9   12    3 |    23   29   26   29   28   25   32   26   27   25    24
  16E |    7   21   10   14   27    6   27   15    9   13    5 |    16   23   20   20   22   18   24   18   17   18    14
  17  |    9   21    8   11   17    5   23    9   11   21    4 |    19   34   24   20   31   20   35   18   23   19    21
  18  |    7   24    8   10   14    4   20    6   11   17    4 |    17   33   22   15   26   16   34   20   15   16    17
  19  |    7   20    6   11   13    4   23   12   11   21    4 |    16   28   17   13   23   14   29   17   17   15    15
  20  |    7   20    8   15   16    5   19    7   11   11    4 |    16   24   17   23   23   17   28   16   19   21    16
  21  |    6   13    6    9    7    7   14    6   10   26    3 |    22   28   26   25   24   22   31   25   23   25    23
  22  |    6   19    7   10   14    4   17    8    6   12    3 |    14   28   17   14   28   13   30   17   18   13    15
  23  |   11   28    9   14   24    4   30    8    5   14    5 |    60   65   65   66   68   63   63   62   63   60    62
  24  |    7   13    8   18   14    6   13    8   11   12    3 |    20   23   26   24   21   21   25   20   24   20    21
  25E |   12   26    9   16   22    5   19   14   10   11    5 |    13   31   22   26   21   17   31   25   20   21    17
  26  |    9   17    8   11   20    4   11   10   11   10    4 |    14   23   19   20   20   16   28   24   24   21    16
 X27  |    6   15    6   12   16    3  ---    7    9   15    3 |    16   21   17   19   24   15  ---   16   18   15    16
  28E |    9   14   10   11   16    5   21   10   12   10    4 |    19   26   23   21   24   16   29   23   18   17    19
  29  |    9   23    8   14   11    5   23    7   10   23    4 |    19   30   23   22   28   19   35   19   20   18    20
 X30E |   18   26   14   13   23   10  ---   18  ---  ---    8 |    41   52   42   39   41   38  ---   42  ---  ---    39
  31  |    7   20    9   24   21    6   24    6   12   16    5 |    10   28   17   23   34   11   27    9   15   10    12
  32  |   12   17    7   14   12    3   20    9   13   12    4 |    13   20   16   20   19   14   25   18   21   16    15
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   18    8   13   16    5   19    9   11   17      |T   19   27   23   22   27   21   30   21   22   20    20
 WRMS |    7   18    8   12   14    5   18    8    9   16      |NE  17   25   21   19   25   17   28   19   21   19    17
 MEDI |    7   17    8   12   15    4   19    9   10   14      |MD  16   26   22   20   24   17   29   20   20   18    17

Table 3.1641.3   GPS week: 1641   Day: 3   MJD: 55734.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    3  ---  ---  ---  ---   90  ---  ---  ---  ---    0 |    42  ---  ---  ---  ---   41  ---  ---  ---  ---    43
   2  |    8   13   10    9    7    3   14   11    6   22    3 |    25   29   28   28   26   26   32   30   27   25    26
   3  |    4   12    5    8   11    4   13    7    8   19    3 |    16   17   14   13   19   13   23   15   12   21    14
   4  |    9    9   10    8   10    5   10   12   13   23    4 |    25   27   30   29   29   26   31   32   27   30    26
   5  |    9   20    9    9   15    5   20   10    8   12    4 |    20   30   21   22   28   19   30   24   23   23    20
   6  |    4   12    5    9   11    4   15    8    7   16    3 |    19   24   21   17   24   18   28   15   16   20    18
   7  |    6   17    9   10   20    6   21    7   10   34    5 |    21   30   25   26   31   21   30   20   23   36    21
   8  |    6   13    7    6   12    4   12    9   12   11    3 |    22   25   25   20   30   22   28   23   28   20    23
   9  |    6   13    5    9   12    4   16   10    8   14    3 |    24   25   24   23   27   22   31   23   19   19    21
  10  |    7   12    6    8    8    5   12   11    8   12    3 |    20   26   26   24   26   22   31   27   24   24    23
  11  |    7   10    7    7    9    3   14    7    6   12    3 |    35   38   39   40   42   36   37   34   39   32    36
  12E |    9   16    9   13   16    5   28   13   10   12    4 |    17   25   19   22   19   17   27   24   18   21    17
  13  |    6   20   10    8   22    6   21   14   11   13    4 |    23   32   24   24   36   23   37   23   26   24    22
  14  |    6   14    8   15   18    3   18    8    8   16    4 |    22   29   29   25   33   23   31   24   27   25    25
  15E |    7   21    5   11   15    5   21   11    6   12    4 |    21   34   22   27   29   23   28   27   25   28    23
  16E |    6   19    7   14   15    4   22   17   10   13    4 |    17   24   18   19   22   17   25   21   19   20    16
  17  |    7   19    5    9   16    5   23   11    9   19    4 |    22   33   24   20   32   20   35   20   23   21    22
  18  |    6   21    7    9   14    5   21   10   11   18    4 |    24   36   26   24   30   23   37   25   22   26    24
  19  |    7   17    4    8   11    4   23   12   10   20    4 |    21   31   22   19   28   20   36   23   23   24    21
  20  |    8   16    7    8   13    4   19    9   15   10    4 |    19   24   18   18   21   17   30   19   27   22    18
  21  |    5   13    5    7    7    5   11    9    9   26    3 |    32   33   30   33   31   29   32   31   31   33    31
  22  |    5   19    6    7   14    4   19    8    9   13    3 |    17   28   22   18   30   17   31   20   22   20    19
  23  |   20   24   13   15   14   12   27   18   11   21    6 |   107  109  110  112  113  107  111  107  116  110   110
  24  |    6   11    7   14   13    4   11    8    6   11    3 |    28   28   29   33   31   27   29   25   30   26    27
  25E |   10   23    8   14   15    6   19   14   13   13    4 |    20   29   22   26   22   20   31   27   20   23    19
  26  |    9   18    5    9   14    4   16   14    8   11    4 |    20   28   24   26   27   23   29   30   21   29    22
  27  |    7   13    4    8   15    5   17    9    9   15    3 |    20   25   21   20   26   18   30   20   18   18    19
  28E |    7   14    8    9   13    4   19   12   11   10    3 |    18   26   23   17   23   18   27   22   22   18    19
  29  |    8   21    8   11   13    6   25   10    7   23    4 |    23   34   26   28   31   24   38   23   24   26    24
 X30E |    9   19    6   14   15   12  ---   10  ---  ---    5 |    40   54   45   39   37   42  ---   43  ---  ---    42
  31  |    9   18    7   35   19    9   20    8   11   15    5 |    19   30   24   38   34   19   31   18   19   19    21
  32  |   11   19    7   13    8    5   16   12   10   11    4 |    16   25   18   22   20   16   26   20   20   18    17
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   17    7   12   14    5   19   11   10   17      |T   25   31   27   27   30   25   33   26   26   26    25
 WRMS |    7   17    7   14   12    5   17   10    8   19      |NE  22   28   24   24   28   21   31   23   23   24    22
 MEDI |    7   17    7    9   14    5   19   10    9   13      |MD  21   29   24   24   29   22   31   23   23   23    22

Table 3.1641.4   GPS week: 1641   Day: 4   MJD: 55735.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    3  ---  ---  ---  ---   96  ---  ---  ---  ---    0 |    39  ---  ---  ---  ---   48  ---  ---  ---  ---    41
   2  |    5    7    6    8    9    4   12    9    8   24    3 |    23   26   25   24   27   23   24   25   26   19    23
   3  |    7   16    6    8   10    4    8    8    7   18    3 |    15   22   18   14   20   14   19   17   17   22    17
   4  |    7    7    9    9   11    4   10    8    9   24    3 |    23   25   26   22   33   22   24   24   21   26    23
   5  |    8   19    6    9   15    6   17   10   10   12    4 |    18   26   17   20   24   17   25   20   20   20    17
   6  |    5   13    6    8    8    4    9    8    6   13    2 |    18   25   23   17   26   19   24   21   22   23    21
   7  |    6   19    9   13   15    5   22   11    8   34    5 |    17   26   23   23   26   16   27   15   14   37    17
   8  |    6   13    7    9   10    5   11   11    8   10    3 |    18   20   19   20   21   17   25   17   17   16    17
   9  |    5   13    7    7   11    4   11   12    8   16    3 |    19   21   18   17   22   18   20   19   20   15    18
  10  |    7   11    5    9    8    7   14    9   10   11    3 |    17   25   22   24   25   18   30   22   17   20    19
  11  |    7   11    5   10    9    5   13    4   13   15    3 |    29   33   33   30   40   30   36   29   34   29    31
  12E |    8   18    9    9   15    6   23   13    9   10    4 |    16   27   25   21   22   19   25   20   21   21    19
  13  |    7   24    9   13   16    3   23   13    8   10    4 |    18   33   23   23   34   20   29   21   21   19    20
  14  |    5   17    8   13   16    5   19    8    9   16    4 |    17   30   22   20   29   18   25   18   18   20    19
  15E |    7   18    7   14   15    6   19    8   11   12    4 |    16   23   21   21   26   19   26   22   22   23    19
  16E |    7   20    8   14   22    7   25   13   14   13    5 |    18   26   18   17   21   19   24   16   22   16    16
  17  |    9   20    8   12   14    5   22    8   10   20    4 |    18   32   25   21   33   21   36   17   21   19    21
  18  |    5   20    8   11   14    4   22    9    8   17    4 |    21   32   25   20   33   20   33   23   24   22    23
  19  |    6   17    4    9   13    4   20   13   10   21    4 |    21   30   24   22   27   21   31   24   23   24    22
  20  |    5   18    7    8   13    4   20    7    9   11    3 |    19   22   17   16   21   18   25   17   21   21    17
  21  |    4   13    6    8    7    8   12    7    8   26    3 |    26   38   30   26   28   29   31   30   29   29    29
  22  |    5   19    8    8   14    4   18    8    6   13    3 |    16   29   19   16   31   16   27   17   13   17    17
  23E |   11   28   10   17   17    7   26   13    9   15    5 |    66   74   68   67   73   68   70   67   67   68    66
  24  |    5   14    6   16   11    6   13    6   11   10    3 |    20   24   24   24   24   22   24   20   22   18    21
  25E |    7   20    8   10   15    4   20   18   10   10    4 |    17   26   21   19   21   15   28   20   15   16    16
  26  |    9   16    5   10   13    5   13   13    9   11    3 |    18   22   19   22   19   18   26   24   21   22    18
  27  |    7   12    9   10   16    4   10    9   10   16    3 |    17   17   16   18   23   17   21   18   20   15    16
  28E |    8   13   10   11   13    6   18   14   12   13    4 |    17   23   23   17   26   16   24   20   20   18    18
  29  |    7   21    9   13   12    6   22    8    9   21    4 |    18   32   26   19   28   19   32   18   18   19    20
 X30E |    9   21    9   18  ---    9  ---   11  ---  ---    6 |    45   50   43   40  ---   40  ---   42  ---  ---    42
  31  |    7   20    9   27   19    5   19    9    9   16    5 |    20   29   25   26   32   18   27   16   17   16    19
  32  |   10   19    6   10    8    5   19    9    7    9    3 |    15   22   17   16   21   16   22   14   18   16    16
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    7   17    7   12   13    5   18   10    9   17      |T   21   28   24   22   27   22   28   22   22   22    22
 WRMS |    7   17    7   11   12    5   16    9    8   16      |NE  19   26   22   20   26   19   26   20   20   21    20
 MEDI |    7   18    8   10   13    5   18    9    9   13      |MD  18   26   23   21   26   19   25   20   21   20    19

Table 3.1641.5   GPS week: 1641   Day: 5   MJD: 55736.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    3  ---  ---  ---  ---   80  ---  ---  ---  ---    0 |    29  ---  ---  ---  ---   38  ---  ---  ---  ---    30
   2  |    6    8   10   10   10    6   11    9    6   23    3 |    14   17   22   15   14   17   18   18   16   16    15
   3  |    5   11    6   13   12    4   12    7    9   17    3 |    11   19   17   13   15   13   14   13   16   18    13
   4  |    9    9    7    8    9    6    8   10    8   26    3 |    15   18   21   14   22   18   22   17   16   25    16
   5  |    9   21    8   11   15    6   18   11    7   12    4 |    14   23   17   14   21   13   24   17   13   18    12
   6  |    8   11    5   15   10    4   10    6   10   12    3 |    17   28   26   18   26   20   27   20   23   24    21
   7  |    6   17    9   12   18    5   19    8    7   32    4 |    11   23   19   16   27   12   23   12   10   35    12
   8  |    5   13    6   12   10    3    9    8    9   10    3 |    12   20   16   15   20   12   20   13   15   11    13
   9  |   11   14    6   13   13    5    9   13   12   15    4 |    20   19   20   17   19   16   17   19   18   16    15
  10  |    8   12    5    8   13    5   10    9    9   11    3 |    11   24   20   14   21   13   23   16   12   14    14
  11  |   10   10    9   11   12    4   12    5    9   16    3 |    28   33   33   27   36   26   28   23   25   24    27
  12E |    9   17    9   10   16    5   23   11    8   15    4 |    10   20   20   17   24   12   20   16   16   17    13
  13  |    6   26    9   12   18    4   20   14   15   11    5 |    12   32   20   19   31   15   23   19   15   17    15
  14  |    7   16    7   13   20    5   19    6    9   12    4 |    11   23   21   15   25   13   21   12   11   14    13
  15E |    6   18    6   16   17    6   23    9    8   15    4 |    14   24   19   22   24   18   27   18   16   23    15
  16E |    8   18    7   16   15    5   24   19   14   14    5 |    12   23   17   18   20   15   22   19   21   15    14
  17  |    8   21   10    9   12    5   22    9    8   19    4 |    16   32   22   16   32   15   33   13   15   14    16
  18  |    6   19    9   14   14    5   22    8   10   17    4 |    17   29   25   19   29   20   30   21   21   22    20
  19  |    5   18    7   11   14    4   22   12   10   23    4 |    15   27   21   14   22   16   29   16   18   15    16
  20  |    7   20    9    8   12    5   18    7    6   11    3 |    14   22   15   12   16   14   22   13   14   18    11
  21  |    6   15    6   11    9    6   13    7    9   26    3 |    18   24   20   16   18   19   21   18   20   17    17
  22  |    5   17    8   11   13    4   18    8    9   11    3 |    11   24   18   13   26   14   26   14   15   15    14
  23E |    8   24    9   14   17    5   26   10   14   14    5 |    36   43   35   36   41   33   40   36   35   35    34
  24  |    9   11    9   14   12    5   10    7    6   13    3 |    25   25   28   19   24   22   22   21   20   22    22
  25E |    7   20    7   13   15    4   26   12    8   14    4 |    11   21   16   16   17   11   30   12   13   17     9
  26  |    9   17    8   10   15    5   12   13   10   10    4 |    12   24   19   17   18   13   19   18   16   14    13
  27  |    9   13    5   13   13    5    9   12   11   13    3 |    13   15   15   15   16   10   14   16   15   12     9
  28E |    7   17   10   11   15    4   18   10   11   10    4 |    10   21   17   14   26   12   19   15   14   13    12
  29  |    9   21    9   12   11    5   21    9   10   27    4 |    17   31   26   20   25   20   32   20   19   20    19
 X30E |   10   22   12   26  ---   16  ---   12  ---  ---    7 |    35   53   45   35  ---   38  ---   37  ---  ---    38
  31  |    6   16    8   22   17    8   20    8   10   17    4 |    13   25   23   19   31   18   29   13   16   14    16
 X32  |   10   18    7   11  ---    4   18    9   10   12    4 |    11   17   17   13  ---   14   20   13   17   15    12
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   17    8   13   14    5   18   10   10   17      |T   16   25   21   17   23   17   23   17   17   18    16
 WRMS |    8   17    8   13   13    5   16    9    9   15      |NE  14   23   20   16   23   15   23   16   16   17    15
 MEDI |    7   17    8   12   13    5   18    9    9   14      |MD  14   24   20   16   24   15   22   17   16   17    15

Table 3.1641.6   GPS week: 1641   Day: 6   MJD: 55737.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
  X1E |    5  ---  ---  ---  ---   78  ---  ---  ---  ---    0 |    40  ---  ---  ---  ---   52  ---  ---  ---  ---    41
   2  |    6    9    6   12    9    6   13    7    7   22    3 |    32   33   32   36   36   32   40   35   39   28    32
   3  |    8   13    7   11   10    4   11    5   11   16    3 |    18   25   17   15   21   15   27   14   22   21    15
   4  |    9   11    8   13   10    6   11    6   10   30    4 |    31   33   34   34   42   32   41   33   38   37    32
   5  |    7   25    8   13   18    7   25    8   10   13    4 |    24   34   19   23   33   23   41   22   31   26    23
   6  |    7   11    6   12   10    3   10    5    7   11    3 |    20   29   23   16   29   19   34   17   22   23    20
   7  |    8   18   12   14   16    6   21    7   11   38    5 |    23   29   25   23   27   23   34   22   28   44    22
   8  |    7   11    7   12   13    6   11    9   13    9    3 |    24   25   22   21   26   23   35   24   27   20    22
   9  |    6   14    7   11   13    4   13   13   10   14    3 |    24   27   21   22   26   24   36   29   33   22    24
  10  |    7   10    5   11    9    5   12    9   12   12    3 |    23   28   26   26   33   25   35   27   32   24    25
  11  |    6   11    7   10   11    5   14    6   10   22    3 |    40   43   43   40   51   40   41   39   44   36    40
  12E |    7   15    8   14   14    5   27   13   12   15    4 |    17   25   22   21   22   19   31   24   25   21    19
  13  |    7   20    8   10   17    3   22   16    8   14    4 |    27   37   27   26   37   26   39   27   33   26    27
  14  |   28   15    9   17   19   12   24   12   10   16    6 |    45   40   35   27   41   30   48   28   38   30    34
  15E |    6   18    7   13   19    6   29    7   12   12    4 |    27   34   27   29   34   30   37   32   33   32    29
  16E |    7   29   10   16   14    4   23    9   13   25    5 |    18   32   19   20   21   18   29   20   22   28    17
  17  |    7   21    9   13   16    6   21    9   14   19    4 |    24   34   21   18   35   21   39   20   27   21    21
  18  |    7   20   12   13   17    5   20   10   10   18    4 |    22   34   24   24   30   21   36   23   27   28    22
  19  |    9   18    8   12   14    3   20   11   10   22    4 |    24   32   24   23   30   22   42   24   26   22    23
  20  |    8   18    8   10   15    3   17    8    8   11    4 |    22   30   18   18   29   20   34   21   26   26    20
  21  |    7   11    6   10    9    5   15    5   10   29    3 |    35   35   34   38   35   35   36   36   38   37    34
  22  |    9   20   10   13   16    5   18    7    7   13    4 |    17   30   20   19   31   17   33   18   24   20    18
  23E |    8   25   11   14   12    5   27    8    8   16    4 |    51   64   53   48   56   52   65   50   56   54    52
  24  |    6   12    8    8   11    5   12    7    9   15    3 |    28   30   30   22   32   25   34   25   30   23    26
  25E |    8   18    8   11   12    5   27   12   12   19    4 |    23   29   26   22   30   26   40   28   32   26    24
  26  |    7   18    9   12   18    7   20   11   13   16    4 |    25   32   25   24   27   23   32   25   32   23    24
  27  |    7   13    5   12   15    6   10   12   10   14    3 |    21   25   20   20   24   21   31   26   28   21    21
  28E |    7   15   10   13   18    5   17   12   12    9    4 |    19   28   22   18   24   18   29   21   25   20    19
  29  |    9   22   10   13   15    6   25    9   12   28    5 |    23   33   20   20   31   20   37   21   23   23    21
 X30E |    7   22   10   23  ---    7  ---    9  ---  ---    6 |    46   63   50   44  ---   48  ---   46  ---  ---    48
  31  |    9   15    8   17   13    6   20    6   12   23    4 |    18   31   25   26   33   21   33   18   23   22    20
  32  |   10   16    8   11   12    3   16    9   10   13    4 |    19   24   19   19   28   18   31   20   26   19    19
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   17    8   12   14    5   19    9   11   19      |T   26   33   26   25   31   26   36   26   30   26    26
 WRMS |    8   17    8   13   14    5   17    8    9   17      |NE  25   31   25   24   31   24   36   24   29   25    24
 MEDI |    7   16    8   12   14    5   18    9   10   16      |MD  24   32   24   23   30   23   35   24   28   23    23



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 4.1641   GPS week: 1641   MJD: 55731.0-55737.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3038 |U   10    10    24 |U    5     6    19 |U    8     9    22 |
emr | emr 2971 |U   13    11    29 |U    6     8    22 |     9    10    24 |
esa | esa 2976 |    10     9    23 |U    5     6    16 |     8     9    20 |
gfz | gfz 2971 |U   11    12    28 |U   14    17    42 |U   13    13    25 |
grg | grg 2921 |    11    10    28 |U    6     9    27 |     9    10    22 |
igr | igr 2974 |    10    10    23 |     5     7    17 |     8    10    21 |
igs | igs 2964 |    11     9    24 |     4     6    17 |     8     9    21 |
jpl | jpl 2851 |    14    11    34 |U    6     7    23 |    10    13    27 |
mit | mit 2976 |U   10     9    25 |U    6     9    21 |U   10    11    24 |



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 5.1641.0   GPS week: 1641   Day: 0   MJD: 55731.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3043 |    11    10    24 |     5     5    19 |    13    16    36 |
emr | emr 2972 |    17    13    29 |     6     7    27 |    13    12    32 |
esa | esa 2976 |    15    11    24 |     5     5    16 |    10    12    31 |
gfz | gfz 2972 |    10     8    23 |    12    19    31 |     6     5    17 |
grg | grg 2976 |    12     9    25 |     5     5    22 |    11    11    33 |
igr | igr 2975 |    11     9    24 |     5     8    20 |    13    15    35 |
igs | igs 2967 |    15    11    23 |     4     4    18 |    13    14    36 |
jpl | jpl 2880 |    16    11    29 |     5     7    28 |    17    22    44 |
mit | mit 2976 |     9     7    25 |     9    16    25 |    14    16    39 |

Table 5.1641.1   GPS week: 1641   Day: 1   MJD: 55732.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3041 |     8     7    22 |     6     6    19 |     7     8    23 |
emr | emr 2971 |     9     8    29 |     7     8    26 |    10    10    35 |
esa | esa 2976 |     8     6    22 |     5     6    19 |     7     9    23 |
gfz | gfz 2969 |    11    15    31 |    20    42    91 |    24    25    39 |
grg | grg 2976 |     8     7    23 |     6     7    27 |     8     8    22 |
igr | igr 2973 |     8     7    20 |     6     8    19 |     7     9    25 |
igs | igs 2937 |    10     6    24 |     5     5    19 |     8     9    25 |
jpl | jpl 2782 |    15    10    34 |     7     8    25 |     8    14    37 |
mit | mit 2976 |     8     6    23 |     7     6    28 |    12    14    31 |

Table 5.1641.2   GPS week: 1641   Day: 2   MJD: 55733.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3048 |    20    12    26 |     5     8    19 |    10     9    23 |
emr | emr 2972 |    18    12    32 |     7    10    23 |    11    11    23 |
esa | esa 2976 |    16    12    26 |     5     8    13 |     9     8    20 |
gfz | gfz 2972 |    21    20    38 |    13    17    37 |     9     9    20 |
grg | grg 2976 |    16    11    26 |     6    10    20 |    10     9    21 |
igr | igr 2970 |    16    12    26 |     5     7    18 |     9    10    19 |
igs | igs 2963 |    16    11    27 |     5     8    16 |     9     9    20 |
jpl | jpl 2784 |    21    12    36 |     6     9    22 |    11    11    26 |
mit | mit 2976 |    16    12    29 |     7     9    22 |    10    10    23 |

Table 5.1641.3   GPS week: 1641   Day: 3   MJD: 55734.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3043 |     8     9    27 |     6     4    15 |     9    11    20 |
emr | emr 2972 |    10    13    33 |     6     9    19 |     9     9    21 |
esa | esa 2976 |     7    10    27 |     5     6    12 |     8     9    19 |
gfz | gfz 2972 |     8    12    30 |    12    10    26 |    12    10    28 |
grg | grg 2976 |     8     9    29 |     5     6    16 |     7    11    23 |
igr | igr 2974 |     8    10    29 |     5     8    13 |     7    10    20 |
igs | igs 2972 |     8    10    27 |     4     5    12 |     7     9    18 |
jpl | jpl 2876 |    12    16    43 |     6     7    21 |     8    10    20 |
mit | mit 2976 |     9    13    30 |     6     7    16 |     7    11    18 |

Table 5.1641.4   GPS week: 1641   Day: 4   MJD: 55735.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3043 |    10    12    28 |     4     6    19 |     9     7    22 |
emr | emr 2972 |    12    10    31 |     5     7    18 |     9     9    18 |
esa | esa 2976 |    10    10    26 |     4     6    15 |     9     8    18 |
gfz | gfz 2971 |    12    15    36 |    12     8    27 |     9     9    23 |
grg | grg 2880 |    15    11    35 |     5     6    21 |    11     9    21 |
igr | igr 2976 |    11    12    27 |     5     6    15 |     8     9    18 |
igs | igs 2971 |    10    10    27 |     4     5    15 |     8     8    19 |
jpl | jpl 2880 |    16    10    37 |     4     6    21 |  ----  ----  ---- |
mit | mit 2976 |    11    12    28 |     5     7    21 |    10     9    22 |

Table 5.1641.5   GPS week: 1641   Day: 5   MJD: 55736.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3026 |     8     8    19 |     6     5    18 |     5     7    18 |
emr | emr 2972 |    10    10    20 |     6     7    18 |     7    11    23 |
esa | esa 2976 |     8     8    17 |     5     6    15 |     6     8    16 |
gfz | gfz 2972 |     8     7    17 |    13    10    49 |    26    27    37 |
grg | grg 2784 |    10    10    28 |    13    23    55 |     8    11    22 |
igr | igr 2975 |     8     8    17 |     5     5    15 |     5     8    17 |
igs | igs 2972 |     8     8    17 |     5     6    15 |     5     8    15 |
jpl | jpl 2877 |    11     8    31 |     6     7    19 |     7    11    22 |
mit | mit 2976 |     7     7    17 |     5     7    16 |     7     9    18 |

Table 5.1641.6   GPS week: 1641   Day: 6   MJD: 55737.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3024 |     7    10    19 |     6     6    27 |     7     8    13 |
emr | emr 2971 |    14    12    28 |     6     8    23 |     9    11    15 |
esa | esa 2976 |     8     9    21 |     4     5    20 |     8     9    13 |
gfz | gfz 2972 |     9    10    21 |    12    13    37 |     8     9    14 |
grg | grg 2880 |    11    11    26 |     5     7    30 |     8     9    15 |
igr | igr 2976 |     8    10    21 |     5    10    19 |     7     8    12 |
igs | igs 2969 |     9     9    21 |     4     6    22 |     8     9    12 |
jpl | jpl 2880 |    11    13    25 |     6     8    26 |     8     9    16 |
mit | mit 2976 |     9     8    23 |     5     7    24 |     8     9    15 |


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    : 21-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 6.1641   GPS week: 1641   MJD: 55731.500-55737.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |      -7     -19     103      18      8 |       2     18
            |      38      37      79      60      5 |       1
emr   uuuuu |      45      -7       8     223      0 |      33     38
            |      28      12      79     116      6 |       2
esa   uuuuu |     -30     -20      17    -147      5 |       9     17
            |      14      17      52      61      4 |       2
gfz   uuuuu |    -115      11     -21    -202      2 |      11     19
            |      10      32      98      47      3 |       2
grg   uuuux |      26     -69      57    -102     62 |     -58     89
            |      11      18      44      83     23 |       3
igr   xxxxx |     -29     -14      18     -54      3 |      -1     16
            |      17      23      73      65      4 |       2
irf   xxxxx |     -11       1     -27     -35     -1 |       3     15
            |       9       9      43      11      3 |       2
jpl   uuuuu |      -1     -32      77     135    -12 |      15     22
            |      70      25      78      35      9 |       2
mit   uuuuu |     -15       3    -109     -13      0 |      14     21
            |      13      17      52      60      3 |       2
ngs   uuuuu |      45      27     105     210      4 |       9     15
            |      28      44     130      87      5 |       1
sio   uuuuu |     132     108    -160      99    -17 |      27     32
            |      18      16     141      57      3 |       5


Table 7.1641.0   GPS week: 1641   Day: 0   MJD: 55731.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |       2       8      77     101      4 |       1     17
emr   uuuuu |     101      17     -67     415      9 |      31     35
esa   uuuuu |     -12     -16      -5     -73      6 |       7     14
gfz   uuuuu |    -111       1     -50    -224      0 |       9     17
grg   uuuux |      23     -71      46    -222     73 |     -60     90
igr   xxxxx |     -19     -48     107     -72     -2 |      -2     14
irf   xxxxx |       3       5     -64     -42     -2 |       4     14
jpl   uuuuu |    -112     -52      11     113     -9 |      16     22
mit   uuuuu |     -13      13    -120     -87     -5 |      16     21
ngs   uuuuu |      49      30     280     260      1 |       8     14
sio   uuuuu |     165     106    -320      36    -17 |      31     35

Table 7.1641.1   GPS week: 1641   Day: 1   MJD: 55732.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |     -16     -53      68     -57      5 |      -1     17
emr   uuuuu |      53      -5     -30     319      2 |      32     36
esa   uuuuu |     -44       3      17     -94      9 |       7     13
gfz   uuuuu |    -108      51    -149    -175     -3 |       8     16
grg   uuuux |      39    -106     124    -102     48 |     -59     90
igr   xxxxx |     -27     -26      -3     -11      0 |      -2     14
irf   xxxxx |     -16       8     -77     -32     -2 |       3     14
jpl   uuuuu |      71     -56     123     108    -11 |      15     22
mit   uuuuu |     -27       5    -113     -44      0 |      14     20
ngs   uuuuu |      35      10     226     144      0 |       8     14
sio   uuuuu |     124     103    -284     139    -18 |      29     34

Table 7.1641.2   GPS week: 1641   Day: 2   MJD: 55733.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |     -30      22     224      90      6 |       1     17
emr   uuuuu |      27     -19     151     260      0 |      34     37
esa   uuuuu |     -46     -29     -76    -180      9 |       9     15
gfz   uuuuu |    -112      52    -144    -174      4 |      10     17
grg   uuuux |      32     -55      47    -197     25 |     -60     90
igr   xxxxx |     -36       1      54       1      7 |      -1     14
irf   xxxxx |     -12       1     -19     -37     -3 |       4     14
jpl   uuuuu |      32      -8     112     169    -12 |      16     22
mit   uuuuu |     -15      10     -30     -38     -1 |      15     21
ngs   uuuuu |      55     -17     196     256     -2 |      10     15
sio   uuuuu |     133      99    -164     160    -21 |      30     34

Table 7.1641.3   GPS week: 1641   Day: 3   MJD: 55734.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |      44     -64      11      28     11 |       4     20
emr   uuuuu |      43     -16      -9     157      3 |      36     40
esa   uuuuu |     -11      -3      39     -99      3 |      12     20
gfz   uuuuu |    -111      10      44    -122      5 |      13     21
grg   uuuux |      23     -72      39     -68     63 |     -57     90
igr   xxxxx |     -13      12      73      39      6 |       2     17
irf   xxxxx |     -10      14     -67     -28      0 |       5     16
jpl   uuuuu |      51     -41     214      88    -12 |      17     23
mit   uuuuu |      -8      27    -202     -43      3 |      17     23
ngs   uuuuu |     -10     -22      95     147      3 |      11     17
sio   uuuuu |     135     139    -254     102    -16 |      29     33

Table 7.1641.4   GPS week: 1641   Day: 4   MJD: 55735.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |     -27      20      64     -16      8 |       2     19
emr   uuuuu |      19      -7       8     204     -6 |      34     38
esa   uuuuu |     -37     -27      59    -156      3 |      11     20
gfz   uuuuu |    -108      -7      97    -223      7 |      13     21
grg   uuuux |      20     -67      17     -55     83 |     -60     89
igr   xxxxx |     -15      10      12    -127      3 |       0     17
irf   xxxxx |     -25     -12     -10     -14     -3 |       3     15
jpl   uuuuu |       9      -2       2     174     -8 |      15     21
mit   uuuuu |     -34     -24    -116      92     -1 |      14     20
ngs   uuuuu |      81      66       1      76      6 |      10     16
sio   uuuuu |     111      89    -120     153    -19 |      26     30

Table 7.1641.5   GPS week: 1641   Day: 5   MJD: 55736.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |      39     -50      73     -31      6 |       3     18
emr   uuuuu |      51     -15     -69     107     -2 |      33     38
esa   uuuuu |     -25     -48      86    -245     -3 |      10     20
gfz   uuuuu |    -131     -38      60    -238     -1 |      13     21
grg   uuuux |      37     -62      14     -91     94 |     -57     88
igr   xxxxx |     -30     -16    -122     -75      0 |      -1     17
irf   xxxxx |     -11      -5      12     -43     -2 |       2     16
jpl   uuuuu |     -86     -58       8     169     -3 |      14     21
mit   uuuuu |     -13      -1     -75      37      1 |      13     20
ngs   uuuuu |      63     100     -22     284     10 |       9     16
sio   uuuuu |     115     104     -63      93    -19 |      23     30

Table 7.1641.6   GPS week: 1641   Day: 6   MJD: 55737.500

                                                         AC LOD  AC LOD
CENT  FLAG  |   Xpole   Ypole     Xrt     Yrt    LOD |    BIAS  BIAS RMS
            |   [uas]   [uas]   [uas/d] [uas/d]  [us]|    [us]    [us]
------------+----------------------------------------+------------------
cod   xxxxx |     -59     -19     203      15     18 |       2     19
emr   uuuuu |      23      -4      70     100     -9 |      33     38
esa   uuuuu |     -34     -22       1    -181      9 |       8     21
gfz   uuuuu |    -128      10      -3    -258      1 |      11     22
grg   uuuux |       9     -53     112      19     51 |     -52     87
igr   xxxxx |     -63     -30       8    -130      8 |      -3     19
irf   xxxxx |      -4      -6      35     -46      5 |       0     18
jpl   uuuuu |      26      -7      70     126    -31 |      11     22
mit   uuuuu |       5     -11    -107      -6      6 |      12     21
ngs   uuuuu |      40      22     -39     307     12 |       7     16
sio   uuuuu |     142     116      82      13    -11 |      18     30



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