[IGSREPORT-19904] Wk 1640 IGS Final Orbits

Jim Ray igs.acc at noaa.gov
Fri Jul 1 04:41:00 PDT 2011


Author:  AC Coordinator / NOAA NGS

sum-file Version 2.0
Final IGS Orbit Combination - Week 1640   (Jun 12, 2011 - Jun 18, 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:

igs1640[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1640[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1640[0-6].cls  IGS GPS clock combination summary report.
igs16407.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs16407.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  |  ALL   | 30
                0  |  COD   | HRAO HRAO
                0  |  EMR   | 30 YELL YELL
                0  |  ESA   | IRKJ
                0  |  GFZ   | MDVJ SFER
                0  |  GRG   | IRKJ
                0  |  JPL   | 25 COCO
                0  |  MIT   | 30
                1  |  COD   | WILL WROC
                1  |  EMR   | 30
                1  |  ESA   | IRKJ UNSA
                1  |  GFZ   | 15 ISPA MDVJ
                1  |  GRG   | IRKJ
                1  |  JPL   | 15 25
                1  |  MIT   | 23 30 23 30 MDVJ
                2  |  COD   | 30 30
                2  |  EMR   | YELL
                2  |  ESA   | ALIC IRKJ UNSA
                2  |  GFZ   | 30 MDVJ
                2  |  GRG   | IRKJ NKLG
                2  |  JPL   | 25 COCO
                2  |  MIT   | CAS1 MAW1 CAS1 MAW1
                3  |  COD   | 30 30
                3  |  GFZ   | 30 GOLD MDVJ YAR2
                3  |  GRG   | IRKJ SANT
                3  |  JPL   | 25
                3  |  MIT   | 30 30
                4  |  EMR   | 30
                4  |  ESA   | IRKJ UNSA
                4  |  GFZ   | 30 CHUR MDVJ
                4  |  GRG   | USN3
                4  |  JPL   | 25
                4  |  MIT   | 30
                5  |  ESA   | 30 ALIC NICO UNSA
                5  |  GFZ   | 25 30 MDVJ REUN
                5  |  GRG   | ADIS AMC2 REUN SANT
                5  |  JPL   | 25 AREQ
                5  |  MIT   | 30 30 MAW1
                6  |  COD   | BRMU
                6  |  EMR   | 30
                6  |  ESA   | IRKJ UNSA
                6  |  GFZ   | 12 25 30 MDVJ
                6  |  GRG   | USN3
                6  |  JPL   | 25 WHIT
                6  |  MIT   | 12 30 12 30 DAV1 DAV1 MDVJ

 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  |    -.5     .4     .2     -19     -4     -9     .17
       EMR  |    4.4   -3.7    6.4      26      3    -13     .36
       ESA  |    2.7   -5.0   11.7     -45    -51     53     .17
       GFZ  |   -2.9     .4    -.5      -3     40      3     .14
       GRG  |    2.1    -.7   21.9      -8     15    -26     .15
       JPL  |    2.1   -3.8    1.4      -5     27     81   -1.03
       MIT  |    3.6   -4.3   15.4     -14      7    -26     .14
       NGS  |    3.4   -4.5   16.8     -49     12      0     .17
       SIO  |     .1   -4.8   -4.8    -100    -74     -3     .15


 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 1.1640.a). It also displays the computed satellite
position sigmas for the combined orbits (table 1.1640.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 2.1640.[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 3.1640.[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 5.1640.0-6).

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 1640 summary.                       (Jun 12, 2011 - Jun 18, 2011)

Table 1.1640.a   GPS week: 1640   MJD: 55724.000-55730.000

         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  249|    0     0    -2   -13    12   -11  -.21    7    7 |    -672     -54     15     91
        |    0     0     0    15     6    27   .02           |     413     438
emr  108|    0    -1    -3  -108    25    -8   .39   18   17 |    1068    -241     17    117
        |    1     1     1     5    31    18   .03           |    1224    1396
esa  128|    0     0     2    22    67     8   .27    7    7 |    -436    -392     15    128
        |    0     0     1     9    14    17   .01           |     907     620
gfz  193|   -1     0     0   -57  -119    10  -.11   10   10 |    -122     276     23    142
        |    0     1     1    30    51     7   .03           |     649     965
grg  133|    2     1     6   -51    -1     0   .48   18   16 |    -101     -29     49    262
        |    0     1     1    28    30    27   .13           |     404     707
igr  n/a|    0     0    -1   -19     6   -18  -.07    5    5 |   20136     236     20    108
        |    0     0     1     8    12    10   .02           |    2141    1311
jpl  139|   -1     0    -5   -42   -51     0   .57   17   16 |     562     -81     19    333
        |    0     1     1    18    13    21   .02           |    1632    1493
mit  257|    0     0     1   -27   -33   -23  -.35   11   10 |    -254       3     20    164
        |    0     0     0    21    19    19   .03           |     714     972
ngs  226|    0     0     1    70   -27     2  -.20    9    7 |    -692     -48   2006   3863
        |    0     0     1    15    21    20   .02           |     417     452
sio  251|   -2     0    -1   182   128    23  -.15   18   18 |     ---     ---    ---    ---
        |    0     0     1    26    19    13   .03           |     ---     ---


Table 1.1640.b   GPS week : 1640   MJD: 55724.000-55730.000   

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



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 2.1640.0   GPS week: 1640   Day: 0   MJD: 55724.000                            

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  249|    0     0    -1     9    10   -21  -.21    6    6 |    -836     513     13     87
        |                      8    -9                       |
emr  108|    1     1    -4  -104    67   -11   .38   18   18 |     764    -411     15    102
        |                      9  -110                       |
esa  128|    1     0     1    30    76     9   .24    6    6 |    -606    -644     14    126
        |                      6     8                       |
gfz  193|   -3    -1     0  -102  -167    17  -.15   10    9 |   -1196    1908     23    145
        |                    -14   101                       |
grg  133|    1     0     8   -49   -56    -7   .60   14   13 |    -648     438     41    247
        |                     78    11                       |
igr  n/a|    0     0    -1   -11     7   -24  -.07    5    5 |   17640      90     21    112
        |                    -27    43                       |
jpl  139|    0     1    -7   -15   -68    18   .56   17   16 |    -290    -805     18    324
        |                    -41    78                       |
mit  269|    0     0     0   -34    -7     1  -.38   11    9 |    -639     467     20    140
        |                      0    20                       |
ngs  226|    0     0     1    85     0     0  -.20    9    8 |    -853     560   2046   4107
        |                    -24   -29                       |
sio  251|   -4     0    -2   169   160    28  -.16   19   19 |     ---     ---    ---    ---
        |                   -136  -102                       |

Table 2.1640.1   GPS week: 1640   Day: 1   MJD: 55725.000                            

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  249|    0     0    -2    -5     8     8  -.23    6    6 |    -213    -624     15     92
        |                     27     4                       |
emr  108|    0    -1    -4  -117    66   -35   .38   17   17 |    1544     -62     16    121
        |                      9   -99                       |
esa  128|    0     0     2    26    54   -12   .27    7    7 |     479    -733     15    136
        |                     29    24                       |
gfz  193|   -2     0    -1   -76  -140    16  -.11   11   10 |     632    -754     23    144
        |                    -47    66                       |
grg  133|    1     0     7   -74   -11   -28   .56   14   12 |     308     227     47    241
        |                     68   -89                       |
igr  n/a|    0     0    -1   -17    14   -34  -.09    5    5 |   19067     425     20     97
        |                    -10    24                       |
jpl  139|   -1     0    -4   -61   -62   -28   .53   17   16 |      24       8     19    360
        |                    -36    12                       |
mit  269|    0     0     0     1   -22   -11  -.39   11    9 |    -173     537     23    179
        |                      1    22                       |
ngs  226|    0     0     1    66   -24    16  -.19    8    8 |    -232    -633   2072   4487
        |                      7   -47                       |
sio  251|   -2     1    -2   189   136    21  -.17   17   15 |     ---     ---    ---    ---
        |                   -142   -88                       |

Table 2.1640.2   GPS week: 1640   Day: 2   MJD: 55726.000                            

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  249|    0     0    -2     3    23   -45  -.23    6    6 |    -496    -478     16     90
        |                    -15   -58                       |
emr  108|    0     0    -4  -109     4   -14   .38   18   18 |    1811   -3018     15    114
        |                     -9   -31                       |
esa  128|    0     0     0    37    86    18   .27    7    6 |   -2118   -1046     16    120
        |                     14     2                       |
gfz  193|   -2     0     1   -75  -191    16  -.16    9    9 |     141    -358     24    133
        |                    -64    56                       |
grg  133|    2     0     7   -43    26     7   .57   15   14 |     121    -494     58    244
        |                     37  -123                       |
igr  n/a|    0     0     0   -33    15    -7  -.09    4    4 |   19818   -1975     19    112
        |                    -17     9                       |
jpl  139|    0     1    -6   -26   -41    29   .60   17   16 |     476   -2611     20    322
        |                     -1   -91                       |
mit  269|    0     0     0   -67   -62    -2  -.35   10    9 |     258    -856     21    179
        |                     18    21                       |
ngs  226|    1    -1     3    72     1     7  -.18    8    7 |    -513    -478   2194   3872
        |                    -27   -46                       |
sio  251|   -2     1    -1   141   105    40  -.13   16   16 |     ---     ---    ---    ---
        |                   -142   -90                       |

Table 2.1640.3   GPS week: 1640   Day: 3   MJD: 55727.000                            

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  249|    0     0    -2   -22    20     4  -.17    6    6 |    -137    -316     14     83
        |                     22    -1                       |
emr  108|    2    -1    -2  -113    26   -18   .39   17   17 |   -1064     768     19    116
        |                     -6   -65                       |
esa  128|    0     0     2    14    50    18   .27    8    7 |     576    -248     18    126
        |                     56    40                       |
gfz  193|   -1     0    -2   -23  -105    12  -.07   10   10 |     535    -728     22    152
        |                    -20    83                       |
grg  133|    2     0     4   -62     5   -10   .54   16   14 |     380   -1430     43    263
        |                     71   -94                       |
igr  n/a|    0     0     0   -29    11   -12  -.07    5    5 |   18207    1556     21    133
        |                     -4    20                       |
jpl  139|   -1     2    -3   -46   -54     8   .60   16   14 |   -1793    1463     20    331
        |                    -10   -35                       |
mit  269|    0     0     2   -15   -21   -38  -.32    9    8 |     493   -1407     21    181
        |                    -18     8                       |
ngs  226|    1     0     2    46   -31    10  -.22    8    6 |    -148    -321   2071   3841
        |                     -7   -50                       |
sio  251|   -3     0    -1   199   145     3  -.11   16   21 |     ---     ---    ---    ---
        |                   -167   -88                       |

Table 2.1640.4   GPS week: 1640   Day: 4   MJD: 55728.000                            

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  249|    0     0    -3   -31     8   -28  -.20    7    7 |   -1036     418     18    100
        |                     -4   -28                       |
emr  108|   -2    -3     0  -106   -13     0   .42   17   17 |     120    1388     18    128
        |                     -6   -20                       |
esa  128|    0     1     2     9    78    17   .27    6    6 |    -686     505     14    123
        |                     52    13                       |
gfz  193|    0     1    -1   -22  -110     6  -.09   12   11 |    -674     877     24    143
        |                     14    68                       |
grg  133|    3     2     7   -32    32   -12   .43   20   16 |    -578     543     49    318
        |                     68  -150                       |
igr  n/a|    0     0    -1   -13    16   -20  -.06    6    5 |   20324    1890     19    101
        |                     -9    14                       |
jpl  139|   -2    -2    -3   -66   -44    -1   .57   18   16 |     171    1794     20    331
        |                    171    14                       |
mit  269|    0     0     0   -16   -41   -28  -.33    9    9 |     220    -528     19    165
        |                     -4     8                       |
ngs  226|    0    -2     1    59   -47    24  -.22    9    7 |   -1055     420   2007   3706
        |                    -13   -27                       |
sio  251|   -3     1    -2   202   121    31  -.15   18   18 |     ---     ---    ---    ---
        |                   -166   -83                       |

Table 2.1640.5   GPS week: 1640   Day: 5   MJD: 55729.000                            

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  249|    0     0     0   -25     9    33  -.20    8    7 |   -1248     135     16     91
        |                      9   -19                       |
emr  108|   -1    -3    -5   -99     5    -1   .43   17   17 |    1744     172     22    121
        |                    -10   -52                       |
esa  128|    1     0     0    20    74    27   .27    7    7 |    -623     365     19    123
        |                     29     9                       |
gfz  193|   -1     0     0   -40   -40     2  -.09   10   10 |     -99     544     23    142
        |                     23    51                       |
grg  133|    2     1     7   -91   -19    -2   .22   24   21 |    -121      88     58    252
        |                    103   -93                       |
igr  n/a|    0     0    -2   -15   -17   -24  -.05    6    5 |   22467     375     24    105
        |                      2    59                       |
jpl  139|   -2     0    -5   -32   -55   -23   .56   18   17 |    2271     302     22    339
        |                    -17   -96                       |
mit  269|    0     0     1   -25   -54   -45  -.33   10   10 |   -1617    1423     19    155
        |                     -9    17                       |
ngs  226|    0     0     0    69   -54   -38  -.18    9    7 |   -1278     147   1798   3148
        |                     34    20                       |
sio  251|   -2     1     1   216   116     6  -.15   20   20 |     ---     ---    ---    ---
        |                   -176   -84                       |

Table 2.1640.6   GPS week: 1640   Day: 6   MJD: 55730.000                            

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  249|    1    -1    -1   -19     5   -30  -.25   12   11 |    -744     -31     19     97
        |                      7   -44                       |
emr  108|    1    -2    -3  -110    20    25   .35   18   17 |    2558    -530     18    119
        |                     -5   -32                       |
esa  128|    0     0     4    17    55   -17   .27    8    7 |     -77    -944     15    144
        |                     36    39                       |
gfz  193|    0     1    -2   -63   -79    -1  -.12   10   10 |    -196     444     23    139
        |                    -10    93                       |
grg  133|    2     5     4    -4    13    56   .43   22   20 |    -169     419     51    275
        |                    -41   -79                       |
igr  n/a|    0     0    -3   -14    -3    -4  -.08    6    6 |   23431    -703     21    100
        |                     17     6                       |
jpl  139|    0     0    -7   -48   -30    -1   .55   18   17 |    3081    -721     20    326
        |                     -4    57                       |
mit  269|    0     0     1   -33   -27   -40  -.35   15   11 |    -325     388     17    155
        |                      1   -11                       |
ngs  226|    0     0    -1    93   -34    -6  -.21   10    7 |    -768     -32   1860   3883
        |                    -52     4                       |
sio  251|   -2     0     1   157   111    33  -.22   22   19 |     ---     ---    ---    ---
        |                   -140   -97                       |

       
       
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 3.1640.0   GPS week: 1640   Day: 0   MJD: 55724.000                            

        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  ---  ---  ---  ---  142  ---  ---  ---  ---    0 |    43  ---  ---  ---  ---   62  ---  ---  ---  ---    44
   2  |    6   15    7    8   14    5   17    7    9   36    4 |    25   26   27   27   26   26   27   25   26   24    24
   3  |    5   13    4    8   11    3    9    7    8   16    3 |    14   23   17   19   25   15   19   15   20   20    17
   4  |    6   12    5    7   12    5   12   10   11   20    3 |    32   31   33   35   34   34   25   38   34   39    32
   5  |    4   25    9   13   18    5   20    9    8   15    4 |    15   27   16   16   26   13   24   15   18   18    14
   6  |    4   12    5    8   10    2    9    7    7   14    2 |    21   26   22   25   30   21   22   22   26   22    23
   7  |    6   20    6    9   19    6   18   10    7   16    4 |    16   26   13   18   24   14   22   13   16   19    13
   8  |    4   16    7    6   13    6   11   16    9   13    3 |    13   20   13   14   15   13   17   20   15   14    12
   9  |    6   14    5   10   10    4   15   12   12   15    3 |    17   24   19   20   23   17   27   17   22   13    18
  10  |    7   15    6    9   11    5   11    7    7   21    3 |    15   20   15   17   17   13   17   17   19   21    14
  11  |    7   15    6   13    7    5   13    6    7   16    3 |    39   48   41   47   53   39   45   39   43   40    42
  12E |    7   19    9    8   19    4   26   12   11   13    4 |    32   37   37   29   36   33   38   34   35   32    33
  13  |    7   22    8   11   21    4   21   12    8   18    4 |    18   31   19   17   33   16   27   18   23   17    18
  14  |    5   22    8   10   16    4   15   12   10   17    4 |    15   29   18   17   24   15   20   17   16   18    15
  15  |    5   19    6   11   20    5   19    9   10   17    4 |    17   26   19   24   29   17   25   21   20   18    18
 X16E |    6   17    6   13  ---    5   20   12   10   11    4 |    18   23   19   20  ---   16   24   19   19   17    17
  17  |    6   22    6    9   13    6   21   14   12   26    4 |    19   27   23   23   22   21   29   24   23   25    19
  18  |    6   18    5   11   15    6   20    8   12   18    4 |    26   31   22   18   25   21   34   24   28   27    23
  19  |    6   16    7   10   12    5   21   11    7   32    4 |    20   30   26   24   31   21   34   21   20   29    22
  20  |    5   21    5    8   16    5   16    9    9   13    3 |    21   27   21   18   26   19   23   19   23   21    19
  21  |    4   11    3   10   10    5   13    8    9   29    3 |    33   31   31   35   27   31   34   35   34   32    31
  22  |    4   15    6   10   14    6   12   10   11   15    3 |    20   24   19   18   23   17   23   22   20   23    18
  23  |    8   28    7   14   16    4   22   10    7   16    4 |    15   33   21   13   27   15   30   16   20   14    16
  24  |    5   18    6   17   11    5   10    8    6   15    3 |    21   26   24   31   28   21   23   20   23   21    22
  25E |    4   25    7    8   12    5   16   11   10   10    3 |    43   50   42   41   42   39   47   44   41   41    41
  26  |    6   14    6    8   13    7   12   13    8   18    3 |    37   35   36   29   36   35   37   33   34   29    34
  27  |    5   13    6    8   13    4   14    9   10   14    3 |    14   20   17   17   21   15   23   12   19   13    14
  28E |    6   15    7    9   12    4   20   12    6   18    3 |    19   20   17   17   20   17   22   17   19   21    17
  29  |   10   19    7    9   15    5   22   14   10   18    4 |    21   29   25   20   25   23   30   24   24   20    22
 X30E |   29   27   14   21   29   16  ---   60  ---  ---   14 |    46   60   59   63   56   54  ---   71  ---  ---    51
  31  |    6   19    6   13   19    6   19   10    9   17    4 |    12   28   17   18   32   14   26   12   14   12    14
  32  |    8   21    6   11   11    4   16   12    8   15    3 |    23   29   23   21   24   18   28   23   24   26    22
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    6   18    6   10   14    5   17   11    9   19      |T   23   29   24   24   28   23   27   24   23   22    23
 WRMS |    6   18    6    9   13    5   16    9    8   19      |NE  20   27   22   22   27   20   26   21   23   22    20
 MEDI |    6   18    6   10   13    5   16   10    9   16      |MD  20   27   21   20   26   18   25   21   22   21    19

Table 3.1640.1   GPS week: 1640   Day: 1   MJD: 55725.000                            

        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  ---  ---  ---  ---   35  ---  ---  ---  ---    0 |    26  ---  ---  ---  ---   35  ---  ---  ---  ---    28
   2  |    5   13   10    8    9    7   17    9    9   35    4 |    17   18   21   19   21   19   23   18   19   25    17
   3  |    5   13    5   10   13    3   11    7    6   16    3 |    16   22   19   18   22   17   20   18   20   21    17
   4  |    5   14    6   10   10    5   12    9    9   18    3 |    23   27   26   32   24   28   21   32   25   36    25
   5  |    4   23    9   13   19    6   20   10    9   16    4 |    13   24   15   16   27   12   23   14   15   18    11
   6  |    5   12    8    7   11    3   11    7    7   14    3 |    18   21   23   19   25   20   20   21   22   19    20
   7  |    5   18    7   10   17    5   17    6    6   14    3 |    15   26   21   19   26   14   24   16   16   19    15
   8  |    4   12    8    8   11    7   13   14    8   10    3 |    15   19   20   15   17   14   20   19   18   17    15
   9  |    5   13    5    9    9    4   14   12   10   11    3 |    12   19   18   17   20   13   24   16   15   16    14
  10  |    8   12    7    8    9    4   10    8    6   19    3 |    14   20   17   19   18   15   20   19   17   19    14
  11  |    8   14    6   15    7    5   14    7    9   14    3 |    22   35   32   36   37   26   35   25   27   25    28
  12E |    8   16    9   10   14    4   26   15   10    9    4 |    25   29   28   25   27   24   32   24   24   24    24
  13  |    6   17    8    8   22    4   20   11    7   13    4 |    16   28   25   21   32   18   28   21   23   19    19
  14  |    4   19    5   11   15    4   19   10    9   16    3 |    15   26   19   18   24   18   24   19   19   19    16
  15  |    6   24    6   23   22    4   20   13    8   11    5 |    17   32   23   33   26   19   27   21   21   22    19
  16E |    5   14    5   13   17    4   19   13    5   10    3 |    18   24   22   23   28   21   27   24   22   20    20
  17  |    7   22    8   11   12    4   22   14    8   23    4 |    16   28   20   23   21   18   26   22   17   20    16
  18  |    7   19    7   10   14    4   19    7    9   17    4 |    17   27   21   19   24   18   27   20   21   23    18
  19  |    5   16    7   10    9    4   19   11    7   28    4 |    16   28   21   20   27   17   30   19   18   25    18
  20  |    7   21    8   10   15    4   17    9    6   12    3 |    22   29   22   21   26   20   25   21   20   22    20
  21  |    5   14    5   10    8    4   14    7    7   27    3 |    22   22   22   28   22   23   22   27   26   21    21
  22  |    4   15    7    7   15    4   13    7    8   14    3 |    14   23   16   19   21   16   19   20   18   21    15
  23  |    7   22    7   10   15    4   21   11   10   16    4 |    12   29   21   16   28   14   29   17   20   16    16
  24  |    5   16    7   20   12    5   13   10    9   15    4 |    17   21   20   31   23   19   20   18   20   22    19
  25E |    6   25    5   11   15    4   18   11    8    6    4 |    28   41   35   35   33   28   39   30   30   30    30
  26  |    7   16    7   10   14    6   13   12    9   11    3 |    39   40   36   41   37   38   38   42   43   41    38
  27  |    4   12    5    9   13    3   13   10    9   11    3 |    12   18   16   16   21   12   21   13   14   14    13
  28E |    7   13    9   12   12    5   24   10    7   15    4 |    14   19   17   19   21   15   21   18   18   18    14
  29  |    8   22    8    6   12    5   22   16    9   17    4 |    19   33   27   23   28   23   31   21   25   23    22
 X30E |   22   30   12   17   24   17  ---   46  ---  ---   11 |    33   43   41   39   41   39  ---   60  ---  ---    36
  31  |    5   20    4   13   17    5   18    9    8   16    3 |    16   28   18   19   30   17   27   15   18   15    16
  32  |   10   19    5   12   13    5   15   12   10   12    4 |    22   29   23   21   24   19   29   20   23   24    21
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    6   17    7   11   14    5   17   11    8   17      |T   18   26   22   23   25   20   25   22   21   21    19
 WRMS |    6   17    7   10   12    5   16    9    8   15      |NE  17   25   21   22   25   18   25   20   20   21    18
 MEDI |    5   16    7   10   13    4   17   10    8   14      |MD  17   27   21   20   25   18   24   20   20   21    18

Table 3.1640.2   GPS week: 1640   Day: 2   MJD: 55726.000                            

        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  ---  ---  ---  ---   46  ---  ---  ---  ---    0 |    25  ---  ---  ---  ---   44  ---  ---  ---  ---    27
   2  |    6   15    7    7   10    6   16    9    8   37    4 |    19   20   21   19   22   19   24   19   18   19    17
   3  |    6   12    3   10   11    2   11    9    7   15    3 |    22   23   27   22   27   24   23   21   30   22    25
   4  |    6   13    9    6   11    5   13   12    8   20    3 |    24   23   26   26   24   25   20   29   27   32    24
   5  |    7   26    7    9   18    5   21    7    7   14    4 |    14   25   14   14   26   13   24   14   12   16    12
   6  |    4   12    4    9   10    3   11    9    7   13    2 |    22   22   25   25   25   23   24   21   26   21    24
   7  |    5   18    8    7   19    4   20    7    6   14    3 |    13   27   21   17   30   14   25   16   15   17    16
   8  |    5   16    7    7   12    6   12    7    7    9    3 |    14   22   17   15   21   14   22   17   13   15    14
   9  |    7   16    6    7   14    3   12   11   11   11    3 |    13   21   19   15   24   14   23   14   18   11    15
  10  |    9   15    6    7   10    5    9    7    6   15    3 |    13   22   16   18   15   15   23   17   19   19    14
  11  |    6   13    4   11   10    4   14    8    8   12    3 |    33   39   34   38   42   34   41   32   31   31    35
  12E |    8   23   10    9   19    6   27   13   10    9    4 |    24   32   32   28   27   26   33   26   26   25    25
  13  |    5   22    7    9   22    3   23   10    5   12    4 |    16   31   20   20   34   18   30   18   22   18    19
  14  |    5   19    6    9   19    4   16   10    7   13    3 |    13   25   18   17   26   15   24   17   15   18    16
  15  |    6   17    8   10   23    4   22   13   11   11    4 |    13   23   18   16   27   14   23   19   17   21    14
  16E |    6   13    5   11   15    3   22   11    6    9    3 |    15   22   21   21   22   17   24   18   17   18    17
  17  |    6   23    9   11   11    4   21   14    9   21    4 |    12   25   17   19   18   13   25   17   14   15    12
  18  |    5   20    6   10   13    4   16    7   10   16    3 |    18   27   22   12   23   16   27   17   21   22    18
  19  |    6   17    6   11   13    3   19   14   10   25    4 |    21   27   26   20   29   20   32   21   19   21    22
  20  |    5   20    6    9   15    5   17    9    8   11    3 |    18   26   20   17   27   16   27   18   19   17    18
  21  |    5   11    4   10   12    5   13    8    9   27    3 |    19   21   20   22   19   19   24   21   23   25    19
  22  |    4   18    7    6   14    4   13    9   10   12    3 |    15   23   19   11   21   15   23   16   19   19    16
  23  |    5   22    6    8   17    3   24    8    6   16    4 |    12   26   19   17   28   14   30   15   18   14    15
  24  |    4   13    6   14   15    4   12    9    6   12    3 |    19   21   25   27   25   22   25   20   18   18    21
  25E |    7   23    5   10   18    4   18   12   11    7    4 |    39   47   38   41   38   36   43   39   37   38    37
  26  |    9   16    6   11   17    5   13   10    7   11    3 |    23   27   21   34   19   25   23   29   27   31    22
  27  |    5   13    6   10   15    4   11    9    9   11    3 |    12   18   18   17   24   15   22   13   17   11    15
  28E |    7   14    7    9   17    4   20   17    4   12    4 |    13   19   18   11   21   13   23   21   17   17    14
  29  |   10   23    7    8   12    6   20   10    8   17    4 |    17   31   23   18   25   20   29   16   20   18    19
 X30E |   24   28   17   17   32   14  ---   43  ---  ---   12 |    27   38   36   35   40   32  ---   57  ---  ---    31
  31  |    6   17    7    8   20    6   16    7   11   13    3 |    14   26   18   18   33   17   27   14   20   14    16
  32  |    9   17    7   14   15    6   19   12    9   11    4 |    19   26   22   20   23   17   31   19   19   23    20
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    6   18    7    9   15    4   17   10    8   16      |T   18   25   22   20   25   19   26   21   20   20    19
 WRMS |    6   18    6    9   14    4   16    9    7   16      |NE  17   24   21   19   25   18   25   18   19   19    18
 MEDI |    6   17    6    9   15    4   16    9    8   12      |MD  17   25   21   19   25   17   24   18   19   18    18

Table 3.1640.3   GPS week: 1640   Day: 3   MJD: 55727.000                            

        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  ---  ---  ---  ---   29  ---  ---  ---  ---    0 |    26  ---  ---  ---  ---   37  ---  ---  ---  ---    26
   2  |    7   13    5   12   10    6   13    8    7   38    4 |    26   28   27   29   26   25   29   26   29   24    25
   3  |    6   14    7   10   10    4   11   11    6   15    3 |    17   27   17   18   23   17   26   24   17   26    18
   4  |    5   12    7    5   11    5    9   11    5   18    3 |    30   31   28   29   29   29   27   35   32   36    29
   5  |    7   22    8   11   19    6   19    7    6   15    4 |    18   28   17   20   28   17   26   18   20   19    17
   6  |    4   11    6   10    9    5   10    9    7   13    3 |    17   23   18   20   23   16   24   21   16   24    17
   7  |    5   17   12    7   21    6   15    9    9   19    4 |    20   30   24   21   32   20   27   20   24   21    20
   8  |    4   13    6    6   15    6   11    6    7    9    2 |    19   26   21   19   22   18   23   19   23   20    19
   9  |    6   13    8    8   15    5   10    8    5    9    3 |    17   22   20   19   26   16   24   16   16   17    17
  10  |    7   12    6    8   11    5   10    5    7   15    3 |    20   24   22   20   21   19   23   22   26   21    20
  11  |    7   16    7   11    9    4   11   10   10   13    3 |    33   44   38   42   43   35   42   37   34   38    36
  12E |    8   17   12   10   17    5   24   12    9    8    4 |    23   32   32   27   30   25   32   25   26   24    25
  13  |    6   22    7    8   25    4   19    8    4   10    3 |    21   34   24   19   36   18   29   21   23   21    20
  14  |    6   18    5   15   22    5   18    7    6   12    4 |    16   24   19   19   27   16   24   17   17   17    15
  15  |    6   21    7    9   25    6   20    9    8   11    4 |    18   29   21   22   34   19   29   22   20   25    19
  16E |    4   18    6   10   13    4   22    7    8   11    3 |    25   29   26   24   24   25   31   23   26   23    24
  17  |    8   19    9   10   15    6   17    9    6   21    4 |    21   27   22   25   27   21   27   24   28   19    21
  18  |    5   21    8    9   16    5   16    5    8   14    3 |    25   28   22   18   25   20   28   19   22   24    20
  19  |    5   18    7   11   11    3   20   15    6   26    4 |    19   32   26   23   30   21   34   26   20   23    22
  20  |    5   20    7    7   14    4   15    7    8   12    3 |    24   27   23   20   24   20   28   24   23   23    21
  21  |    5   12    5    8   10    6   11    6    6   27    3 |    30   29   28   27   26   28   30   28   29   31    27
  22  |    5   16    7   12   16    3   13    7    6   12    3 |    21   24   21   22   24   18   23   19   20   22    18
  23  |    7   25    5    5   20    5   23    7   10   15    4 |    15   32   21   17   31   16   31   16   17   16    17
  24  |    6   17    9   13   12    5    9    9    8   11    3 |    20   28   24   28   25   22   25   22   24   22    22
  25E |    7   24    6   19   21    5   18   10   12   10    4 |    40   46   38   42   40   37   47   41   43   40    39
  26  |    7   14   10    8   17    6   12   11    9   15    3 |    50   53   55   51   51   51   52   54   55   54    52
  27  |    7   12    5    6   18    4   11    8    7   10    3 |    15   20   17   18   25   15   23   15   15   18    15
  28E |    6   13   10    9   14    6   20    8    6   14    3 |    16   22   16   17   20   15   22   17   23   18    15
  29  |    9   20    8   10   13    5   21    8    8   17    4 |    23   32   26   22   29   22   31   22   22   23    22
 X30E |   24   26   18   20   43   15  ---   43  ---  ---   12 |    30   37   25   30   41   26  ---   52  ---  ---    26
  31  |    5   19    6    8   23    6   18   10   10   16    4 |    17   28   21   20   35   19   29   18   16   16    17
  32  |    9   21    7   12   11    4   17   10   11   11    4 |    24   26   25   21   22   20   31   22   23   25    22
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    6   17    7   10   16    5   16    9    8   16      |T   23   29   24   24   29   22   29   24   24   24    22
 WRMS |    6   17    7   10   14    5   14    8    6   21      |NE  22   29   24   23   28   21   28   23   23   24    21
 MEDI |    6   17    7   10   15    5   15    8    7   13      |MD  21   28   23   21   27   20   28   22   23   23    20

Table 3.1640.4   GPS week: 1640   Day: 4   MJD: 55728.000                            

        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  ---  ---  ---  ---   90  ---  ---  ---  ---    0 |    33  ---  ---  ---  ---   77  ---  ---  ---  ---    35
   2  |    7   12    5   10   12    5   12   12   10   39    4 |    19   24   20   21   20   19   19   21   22   23    18
   3  |    6   13    4   12   14    4   14    9    7   18    3 |    23   28   25   28   30   25   29   28   27   27    25
   4  |    9   20    5   12   10    4    9   10   11   21    4 |    29   37   31   28   29   29   30   33   33   39    29
   5  |    7   20    6   13   18    7   22   10    9   17    4 |    16   26   17   15   20   15   23   17   22   20    14
   6  |    6   11    4   10   14    4   15    9    8   15    3 |    23   26   26   28   31   23   26   27   27   25    25
   7  |    7   17    7   11   29    5   17   12    6   24    4 |    16   28   16   18   33   15   27   18   17   24    15
   8  |    5   13    6    8   21    4   11   12    8   12    3 |    17   23   16   14   24   15   24   18   23   19    16
   9  |    6   12    8   11   19    6   13    9    9   12    3 |    15   20   21   18   27   14   26   16   17   17    16
  10  |    8   16    5   10   15   22   12    8   13   16    3 |    19   27   17   19   16   23   23   20   26   22    17
  11  |    7   12    4   10    9    6   16    7    7   15    3 |    32   45   35   38   45   33   43   35   36   36    35
  12E |    8   15   10    7   15    4   28   11   10   10    4 |    22   29   29   23   33   24   32   23   23   23    23
  13  |    5   20    5   11   33    3   22   10    7   12    4 |    16   32   18   20   41   16   31   18   21   20    17
  14  |    5   18    5   11   30    5   16    5    8    9    3 |    12   26   17   16   32   14   23   15   17   18    14
  15  |    5   20    6   11   36    2   19    8   10   13    4 |    15   26   18   17   39   16   21   18   19   22    15
  16E |    6   16    7    9   26    4   23    8    8   13    4 |    17   25   22   20   32   20   25   18   19   19    18
  17  |    7   18    9   12   14    7   19    7    6   26    4 |    16   25   18   22   20   18   26   19   20   25    17
  18  |    6   19    6   10   17    5   19    6    8   16    3 |    20   27   20   16   18   18   28   18   18   22    17
  19  |    7   16    5   11   16    2   21   14    5   27    4 |    18   31   25   23   26   21   33   24   22   21    21
  20  |    6   18    5    9   14    3   16    8    7   13    3 |    18   24   19   21   20   16   23   19   20   23    17
  21  |    5   10    6   10   10    9   12    7    5   29    3 |    22   20   21   22   18   19   22   24   21   25    20
  22  |    5   17    5    8   17    4   14    6    9   13    3 |    15   24   14   13   21   15   23   17   18   20    14
  23  |    6   23    5   12   27    3   23    8    9   17    4 |    11   30   17   16   35   12   31   14   18   14    14
  24  |    5   17    5   13   13    7   15    8    7   10    3 |    19   27   22   28   24   20   28   21   24   20    21
  25E |   11   18    6   20   19    6   21    9   10   15    4 |    65   67   67   69   64   65   69   70   60   69    65
  26  |   10   15    5   10   23    4   14   14   14   19    4 |    31   31   29   28   38   29   35   35   31   34    30
  27  |    6   12    6    9   22    4   13   10   11   12    3 |    13   20   17   16   28   12   24   12   17   14    13
  28E |    4   12    8    9   15    5   20   11   10   17    3 |    17   21   18   17   19   17   29   19   25   23    17
  29  |    9   19    8   10   12    6   21    8    9   19    4 |    18   29   22   21   24   18   28   19   20   21    19
 X30E |   18   27   10   15   27   11  ---   31  ---  ---    9 |    23   42   26   24   34   27  ---   38  ---  ---    24
  31  |    8   20    8   23   29    8   20    8   13   15    5 |    13   30   18   25   36   15   28   11   17   13    13
  32  |    9   22    5   11   14    5   19   10   10   12    4 |    19   28   21   23   18   17   31   19   22   24    19
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    7   17    6   12   20    6   18    9    9   18      |T   20   28   22   22   28   22   28   22   23   24    21
 WRMS |    7   17    6   11   16    5   16    9    7   18      |NE  18   27   20   21   27   18   27   20   22   22    18
 MEDI |    6   17    6   11   17    5   16    9    9   15      |MD  18   27   20   21   28   18   27   19   21   22    17

Table 3.1640.5   GPS week: 1640   Day: 5   MJD: 55729.000                            

        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  ---  ---  ---  ---   66  ---  ---  ---  ---    0 |    30  ---  ---  ---  ---   80  ---  ---  ---  ---    32
   2  |    5   12    6    9   12    7   17   16    8   43    5 |    19   24   23   22   23   21   27   25   22   24    19
   3  |    7   13    6   10   15    4   13    7    8   18    3 |    16   24   19   18   22   17   26   18   20   20    17
   4  |    7   10    7    6   17    6   11   11   10   25    3 |    24   26   22   26   28   25   23   31   28   39    24
   5  |    8   27    7   12   21    6   20   10    8   17    4 |    13   33   16   17   23   14   31   19   17   21    15
   6  |    7   13    6    9   15    4   12    6    9   14    3 |    16   22   19   20   24   17   27   19   22   19    18
   7  |    7   16    8   12   38    6   16   12    7   24    4 |    21   31   21   22   40   21   32   24   25   28    21
   8  |    3   14    6   10   31    5    9   16    9   11    4 |    22   28   22   23   32   21   30   27   26   25    22
   9  |    5   14    6    8   24    4   11    7    7   15    3 |    17   24   19   19   36   19   28   18   23   18    18
  10  |    7   12    7    9   21    8   10   10    6   18    3 |    20   26   22   20   24   18   31   25   24   27    21
  11  |    9   12    5   10    8    4   15   11    7   14    3 |    23   37   29   31   38   26   39   31   25   29    28
  12E |   12   18    9    7   25    7   29    6   11   12    4 |    20   27   26   21   30   21   30   20   23   21    21
 X13  |    6   21    6   12  ---    4   19    9    7   11    4 |    20   36   23   21  ---   20   30   21   26   24    21
  14  |    6   19    7    9   38    4   22    8   12   10    4 |    14   27   20   18   39   17   30   19   23   19    17
 X15  |    5   18    6   10  ---    7   17    7    9   12    3 |    16   30   19   22  ---   18   30   21   22   27    19
  16E |    6   18    6    7   30    5   24    7    9   13    4 |    22   28   25   21   34   24   30   21   26   19    22
  17  |    6   21    8    9   17    5   21    8    9   24    4 |    18   30   21   24   27   22   32   24   25   29    21
  18  |    7   20    6   12   18    4   17    8    6   15    3 |    21   32   25   18   26   22   31   23   24   25    21
  19  |    9   17    7   14   18    3   24   15    6   31    5 |    18   31   23   21   27   19   37   24   17   19    20
  20  |    7   19    7    8   19    3   19    8   10   10    3 |    21   30   24   20   29   21   31   23   25   25    22
  21  |   10   12    6    9   10    7   11    6    9   28    3 |    18   26   24   22   23   21   25   24   21   32    20
  22  |    6   20    5    9   17    4   16    7    7   12    3 |    16   29   19   18   23   19   27   20   19   23    17
  23  |    7   21    7    9   37    5   21    8    6   15    4 |    13   29   21   16   41   16   31   16   20   16    16
  24  |    8   15    5   15   13    7   13    9    8   12    3 |    17   23   21   30   25   21   29   24   22   21    21
  25E |   22   20   11   15   25   10   28   19   19   19    6 |    61   60   57   48   57   54   67   45   50   50    52
  26  |   14   16    5    8   31    5   15   10   10   33    5 |    79   83   76   78   76   77   83   84   78   95    78
  27  |    4   13    5    9   27    4    9    8    8   17    3 |    14   22   18   19   36   17   27   16   22   17    17
  28E |    6   20   11    9   22    5   22   16   10   23    4 |    17   28   18   21   29   17   29   22   22   26    18
  29  |    9   23    6    7   14    7   24    8   10   19    4 |    18   34   25   19   27   20   33   21   25   23    21
 X30E |   15   30   11   19   27   18  ---   31  ---  ---    9 |    22   43   27   21   28   20  ---   35  ---  ---    21
  31  |    6   20    9    6   36    5   26   10   15   12    4 |    11   27   17   11   43   14   28   14   20   13    13
  32  |    9   20    6    9   18    4   17   10    8   15    4 |    22   36   24   23   23   21   34   23   24   30    23
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   17    7   10   24    6   18   10    9   20      |T   21   31   24   23   32   24   32   25   25   26    23
 WRMS |    7   17    7   10   21    5   17   10    7   20      |NE  20   30   23   23   31   21   32   24   24   26    21
 MEDI |    7   18    6    9   21    5   17    9    8   15      |MD  18   29   22   21   28   20   30   23   23   24    21

Table 3.1640.6   GPS week: 1640   Day: 6   MJD: 55730.000                            

        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  ---  ---  ---  ---   92  ---  ---  ---  ---    0 |    41  ---  ---  ---  ---   60  ---  ---  ---  ---    43
   2  |    8   12    8   11   15    5   15   14   10   48    5 |    27   28   29   30   28   26   26   29   28   30    25
   3  |   13   12    6   10   16    6   12   11    8   21    4 |    15   18   17   15   23   14   20   12   17   19    14
   4  |   16   12    7    9   17    5    9   12   11   35    5 |    27   32   33   28   34   31   25   40   29   51    30
   5  |   11   22   10    8   19    6   18   10   10   17    4 |    14   24   17   13   21   15   23   21   19   26    14
   6  |   10   12    6    7   14    5   12   10    7   17    3 |    18   21   23   21   28   18   21   19   22   22    19
   7  |   10   18    7    9   31    8   18   14    6   27    5 |    17   28   19   18   38   16   26   18   16   25    17
   8  |   10   14    5    8   21    7   11   22    8   12    4 |    17   22   14   15   30   15   23   18   15   15    14
   9  |   16   12    5    8   21    5   12    9    7   20    4 |    19   20   18   14   27   13   21   11   15   13    14
  10  |   13   16    6   11   17    8   10   11    8   18    4 |    16   23   17   13   17   13   19   21   19   23    14
  11  |    9   12    6    9   15    5   14    9    8   16    3 |    40   47   48   47   55   42   47   45   40   45    44
  12E |   13   17    7   10   23    6   30   13    8   15    5 |    24   29   28   27   26   23   30   28   21   25    24
  13  |    9   25    6   12   33    4   20    8    8   12    5 |    17   34   24   18   44   18   28   17   17   20    18
  14  |    7   18    5   11   29    3   18    6    7   11    4 |    16   26   22   18   31   16   25   15   20   17    17
 X15  |   11   20    6   10  ---    4   21   10   10   13    4 |    21   28   20   17  ---   19   27   19   22   24    19
  16E |    9   17    5    7   20    5   28   11    8   12    4 |    27   29   29   29   30   27   35   27   24   27    26
  17  |   10   19    9   10   21    6   20   13   11   31    5 |    18   25   18   17   28   16   25   20   19   24    15
  18  |    9   24    8   10   17    6   18   12    8   19    4 |    22   31   19   15   23   16   27   17   14   22    16
  19  |   10   18    8   10   19    5   22    8   11   37    5 |    22   32   27   21   29   22   35   21   25   21    23
  20  |    8   18    6   11   18    5   18    7    7   14    4 |    25   28   24   20   28   22   30   21   23   22    22
  21  |   15   11    5   11   14    7   13   12    9   32    4 |    31   29   25   26   27   26   29   29   26   35    25
  22  |    8   16    7   11   19    6   15   11    6   16    4 |    17   24   16   14   24   13   24   15   14   20    14
  23  |    8   24    7   11   25    4   25   10    7   15    4 |    14   29   21   14   33   14   29   15   15   14    15
  24  |   17   13    7   15   19    7   12    9    9   12    4 |    27   24   30   34   33   27   25   26   21   22    26
  25E |   24   33   21   21   37   17   29   53   30   27   11 |    97  120  118  118  118  107  113  133  103  115   112
  26  |   13   15   10   10   24    5   12   12    9   23    4 |    31   29   29   26   34   27   28   28   28   28    27
  27  |   12   13    5    8   19    4   11   10    8   17    3 |    15   19   14   12   25   11   19   11   11   12    11
  28E |   10   15    8    8   20    6   21   14    7   12    4 |    20   21   20   13   25   15   25   16   16   22    15
  29  |   12   22   10   10   16    8   23    7    7   20    4 |    24   36   28   24   30   24   35   22   24   26    24
 X30E |   17   20    9   15   17    7  ---   23  ---  ---    7 |    32   45   38   28   38   33  ---   37  ---  ---    33
  31  |   10   17   10   10   28    4   20   14   13   13    5 |    15   29   21   20   35   16   26   13   14   14    15
  32  |   11   22    7    8   19    5   21   10    9   15    4 |    23   31   24   18   25   19   30   20   21   28    22
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   12   18    8   10   22    6   18   15   10   22      |T   24   31   26   23   32   24   29   25   23   26    23
 WRMS |   11   17    7   10   20    6   17   11    7   19      |NE  21   27   22   20   30   19   26   20   20   23    19
 MEDI |   10   17    7   10   19    5   18   11    8   17      |MD  21   28   23   18   28   18   26   20   20   22    19



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 4.1640   GPS week: 1640   MJD: 55724.0-55730.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3035 |U    7     8    21 |U    6     7    19 |U    9    10    22 |
emr | emr 2971 |U   13    11    30 |U    9     8    21 |     9    10    23 |
esa | esa 2976 |     9     9    23 |U    5     6    16 |     8    10    24 |
gfz | gfz 2968 |U    8     8    22 |U    5     7    19 |U   10    12    27 |
grg | grg 2921 |     8     9    25 |U    6     7    20 |    10    11    27 |
igr | igr 2964 |     9     8    23 |     5     6    16 |     8     9    23 |
igs | igs 2945 |    10     9    24 |     5     5    16 |     8    10    23 |
jpl | jpl 2878 |    13    11    33 |U    5     7    21 |     9    13    24 |
mit | mit 2976 |U   11     9    26 |U    6     7    20 |U    9     9    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 5.1640.0   GPS week: 1640   Day: 0   MJD: 55724.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3037 |     7     8    16 |  ----  ----  ---- |     8     9    25 |
emr | emr 2972 |     9     8    25 |  ----  ----  ---- |     8     9    20 |
esa | esa 2976 |     7     7    15 |  ----  ----  ---- |     9    10    29 |
gfz | gfz 2971 |     7     7    17 |  ----  ----  ---- |     9    11    26 |
grg | grg 2880 |     7     6    16 |  ----  ----  ---- |    12    11    27 |
igr | igr 2971 |     7     7    15 |  ----  ----  ---- |     8    10    27 |
igs | igs 2880 |     9     7    16 |  ----  ----  ---- |    10    11    27 |
jpl | jpl 2879 |    11     8    20 |  ----  ----  ---- |     9    13    25 |
mit | mit 2976 |     9     6    16 |  ----  ----  ---- |     9    11    31 |

Table 5.1640.1   GPS week: 1640   Day: 1   MJD: 55725.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3037 |     6     8    20 |  ----  ----  ---- |    14    18    42 |
emr | emr 2972 |     9    10    25 |  ----  ----  ---- |    13    15    36 |
esa | esa 2976 |     6     8    19 |  ----  ----  ---- |    14    21    44 |
gfz | gfz 2971 |     6     9    21 |  ----  ----  ---- |    12    18    42 |
grg | grg 2976 |     6     9    22 |  ----  ----  ---- |    12    18    46 |
igr | igr 2974 |     6     8    19 |  ----  ----  ---- |    12    18    45 |
igs | igs 2972 |     6     9    20 |  ----  ----  ---- |    13    20    45 |
jpl | jpl 2880 |    12    13    33 |  ----  ----  ---- |    14    34    43 |
mit | mit 2976 |     6     8    21 |  ----  ----  ---- |    12    15    37 |

Table 5.1640.2   GPS week: 1640   Day: 2   MJD: 55726.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3049 |     7     5    20 |     6     6    21 |     6     9    19 |
emr | emr 2972 |    10     7    24 |     8     8    21 |     9    11    26 |
esa | esa 2976 |     7     6    18 |     5     7    17 |     7    11    20 |
gfz | gfz 2964 |     6     5    16 |     5     8    18 |     9    12    23 |
grg | grg 2976 |     7     6    20 |     5     7    19 |     7    10    22 |
igr | igr 2958 |     7     5    17 |     5     7    15 |     7     9    19 |
igs | igs 2961 |     6     6    18 |     5     6    16 |     7    10    19 |
jpl | jpl 2880 |    12     7    25 |     6     8    23 |    11    11    26 |
mit | mit 2976 |     7     6    19 |     6     8    24 |     8     8    17 |

Table 5.1640.3   GPS week: 1640   Day: 3   MJD: 55727.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3029 |     7     9    18 |     8     5    20 |     7     7    19 |
emr | emr 2971 |    10    13    23 |    10     7    24 |     9    12    20 |
esa | esa 2976 |     7     8    18 |     6     8    19 |     8     8    23 |
gfz | gfz 2966 |     7     7    17 |     6     7    19 |     8     9    27 |
grg | grg 2976 |     7     8    19 |     7     7    21 |     9    11    26 |
igr | igr 2959 |     8     8    18 |     5     6    18 |     9    10    26 |
igs | igs 2931 |     8     9    19 |     6     6    17 |     7     8    22 |
jpl | jpl 2880 |    10     9    22 |     6     7    20 |     8    11    19 |
mit | mit 2976 |     7     8    17 |     8     8    25 |     9     9    28 |

Table 5.1640.4   GPS week: 1640   Day: 4   MJD: 55728.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3033 |     8    10    25 |     4    11    19 |     9     9    21 |
emr | emr 2972 |    10    11    27 |     9     9    24 |     9     6    22 |
esa | esa 2976 |     9    10    27 |     4     6    14 |     8     7    21 |
gfz | gfz 2966 |     8    10    25 |     5     9    25 |    10    11    26 |
grg | grg 2976 |     9     9    29 |     4     6    14 |     9     7    24 |
igr | igr 2972 |     8    10    25 |     4     6    18 |     8     6    19 |
igs | igs 2953 |     8     9    26 |     4     6    15 |     8     7    21 |
jpl | jpl 2880 |    14    11    35 |     4     6    20 |     7     6    23 |
mit | mit 2976 |     9     9    25 |     5     6    16 |     9     7    23 |

Table 5.1640.5   GPS week: 1640   Day: 5   MJD: 55729.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3030 |     8    10    26 |     6     6    17 |     6     6    16 |
emr | emr 2972 |    13    12    41 |     9     8    20 |     8     7    21 |
esa | esa 2976 |     9    11    31 |     5     6    17 |     6     5    17 |
gfz | gfz 2972 |     9    10    30 |     6     7    17 |     8     9    21 |
grg | grg 2784 |    10    12    33 |     8     7    27 |     8     8    22 |
igr | igr 2944 |     8    10    29 |     5     7    15 |     6     4    14 |
igs | igs 2969 |     9    11    32 |     5     5    16 |     6     5    17 |
jpl | jpl 2872 |    11    10    39 |     5     8    21 |     7     5    20 |
mit | mit 2976 |    12    16    42 |     6     8    19 |     8     5    19 |

Table 5.1640.6   GPS week: 1640   Day: 6   MJD: 55730.0

CENT| CLK EPO  |        BRUS       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3030 |    10     9    26 |     8     7    18 |     9    13    15 |
emr | emr 2972 |    29    16    44 |     7     6    18 |     8    12    15 |
esa | esa 2976 |    17    12    33 |     5     4    13 |     7    10    14 |
gfz | gfz 2971 |    11    11    27 |     5     6    15 |    11    13    22 |
grg | grg 2880 |    13    13    36 |     7     7    21 |    10    15    23 |
igr | igr 2976 |    22    11    35 |     5     6    14 |     7    10    14 |
igs | igs 2954 |    24    12    39 |     5     4    15 |     8    11    14 |
jpl | jpl 2880 |    20    16    56 |     5     7    22 |     8    10    16 |
mit | mit 2976 |    24    13    39 |     5     5    16 |     8    11    14 |


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 6.1640   GPS week: 1640   MJD: 55724.500-55730.500

                                                         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 |      19     -11      82      -4     -4 |       3     13
            |      25      18      70      59      7 |       2
emr   uuuuu |      55      -1     111     260     -2 |      33     36
            |      38      15      91      57      9 |       2
esa   uuuuu |     -23     -35     -23      45     -2 |       8     13
            |      16      16      84      63      2 |       2
gfz   uuuuu |     -78      13      31     -33      2 |       8     12
            |      13      24     134      43      6 |       2
grg   uuuux |      85     -59      55    -123    -67 |     -14     36
            |      44      41     147     117     65 |      16
igr   xxxxx |     -29       3      48     -13     -2 |       0     11
            |      21      18      53      47      6 |       3
irf   xxxxx |      -4      -4      -4     -39     -3 |       6     12
            |      12      12      12      23      3 |       2
jpl   uuuuu |       5     -13     115      15      2 |      16     22
            |      60      65      87      79      8 |       3
mit   uuuuu |     -16      -2     -72    -132     -6 |      20     23
            |      21      20      46      15      5 |       2
ngs   uuuuu |      21       8      41       3      0 |       8     13
            |      22      23      86      88      8 |       1
sio   uuuuu |      87     149    -233      38      3 |      29     31
            |      17      26      82      53      6 |       2


Table 7.1640.0   GPS week: 1640   Day: 0   MJD: 55724.500

                                                         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 |      18     -16      66      29      7 |       5     11
emr   uuuuu |     119     -17      70     333      7 |      35     36
esa   uuuuu |       1     -14     -11     -19      0 |       9     13
gfz   uuuuu |     -92       6     -56     -29     -4 |       9     12
grg   uuuux |      -2     -86     255    -238     27 |      -2     19
igr   xxxxx |     -34      19     -11      39      1 |       3     10
irf   xxxxx |       9      -8       1     -25      3 |       7     11
jpl   uuuuu |     -69      33      61      17     -2 |      19     23
mit   uuuuu |     -11      -8     -67    -106      5 |      21     22
ngs   uuuuu |      38      16     -22     114      3 |       9     12
sio   uuuuu |     111     128    -135      74      2 |      30     31

Table 7.1640.1   GPS week: 1640   Day: 1   MJD: 55725.500

                                                         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     -31       0      35    -10 |       6     12
emr   uuuuu |      87     -13     258     242     -9 |      37     39
esa   uuuuu |     -36     -33    -195      37      2 |       9     13
gfz   uuuuu |     -78      43     -13     -26     -3 |      10     12
grg   uuuux |      77     -72      71     -93    -16 |      -1     21
igr   xxxxx |     -36       6      44     -32      6 |       3     11
irf   xxxxx |     -12      -4     -12     -34     -4 |       8     12
jpl   uuuuu |     -24      32     272     -10    -15 |      20     24
mit   uuuuu |     -34      -5     -53    -133     -6 |      23     24
ngs   uuuuu |      35     -11     147       3      9 |       9     13
sio   uuuuu |      76     138    -202      69      1 |      30     32

Table 7.1640.2   GPS week: 1640   Day: 2   MJD: 55726.500

                                                         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 |      37      -2      68     -56     -7 |       2     12
emr   uuuuu |      10      -8     165     264    -17 |      34     36
esa   uuuuu |     -23     -31      37      23     -4 |       7     12
gfz   uuuuu |     -77      47    -155     -37      0 |       7     10
grg   uuuux |     102     -54     -78     -79    -35 |      -3     23
igr   xxxxx |     -30       0      22     -37     -5 |       1      9
irf   xxxxx |     -21     -17      20     -86     -4 |       5     11
jpl   uuuuu |      70     -16      28     -98      0 |      15     21
mit   uuuuu |     -42     -35       4    -139    -10 |      20     23
ngs   uuuuu |      25      10     108     105      8 |       8     12
sio   uuuuu |      69     125    -169     -48      5 |      27     29

Table 7.1640.3   GPS week: 1640   Day: 3   MJD: 55727.500

                                                         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 |      -6     -27      42      92     -5 |       0     14
emr   uuuuu |      58       1     156     264     -5 |      31     34
esa   uuuuu |     -47     -61     -34      91     -4 |       5     12
gfz   uuuuu |     -90      15     -56     -42      8 |       5     10
grg   uuuux |      87     -76      49    -129    -62 |      -8     29
igr   xxxxx |     -27      -1      15     -55     -9 |      -1     11
irf   xxxxx |      -7      -5      -3     -11     -3 |       4     12
jpl   uuuuu |      28       5      59     -59      6 |      13     20
mit   uuuuu |     -15      13     -66    -142     -8 |      19     23
ngs   uuuuu |      43       2     112      14     -9 |       8     12
sio   uuuuu |      81     162    -171      71      9 |      27     28

Table 7.1640.4   GPS week: 1640   Day: 4   MJD: 55728.500

                                                         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 |      23      21      66      -6      0 |       0     14
emr   uuuuu |      15      23     105     148      0 |      30     34
esa   uuuuu |     -18     -35      65      55     -5 |       6     12
gfz   uuuuu |     -73       3     151      42     10 |       6     11
grg   uuuux |     145     -51      62     -51   -115 |     -12     36
igr   xxxxx |     -19      26      25      59     -6 |      -3     11
irf   xxxxx |      -5      17     -17     -36     -2 |       3     12
jpl   uuuuu |     -19    -154     197      85      7 |      13     20
mit   uuuuu |     -13      21    -147    -117     -9 |      18     22
ngs   uuuuu |      22      30     -86     -86    -11 |       7     12
sio   uuuuu |      78     183    -322       6     11 |      27     29

Table 7.1640.5   GPS week: 1640   Day: 5   MJD: 55729.500

                                                         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 |      17      -2     106     -65      1 |       2     14
emr   uuuuu |      50      17      34     281      8 |      32     36
esa   uuuuu |     -11     -22     -30     154     -2 |       8     13
gfz   uuuuu |     -53     -16     153     -28      7 |       9     14
grg   uuuux |      91     -96     197    -309   -162 |     -25     51
igr   xxxxx |     -61       5     108      -5      4 |      -3     11
irf   xxxxx |      -2       7      -8     -39     -3 |       5     13
jpl   uuuuu |      94      24     100      37      5 |      16     22
mit   uuuuu |     -19      16     -76    -151     -7 |      18     23
ngs   uuuuu |     -22     -27     -16    -121     -5 |       8     13
sio   uuuuu |      82     183    -309      -3      3 |      30     33

Table 7.1640.6   GPS week: 1640   Day: 6   MJD: 55730.500

                                                         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 |      57     -21     223     -56    -15 |       4     15
emr   uuuuu |      45      -9     -14     287      4 |      34     38
esa   uuuuu |     -26     -50       5     -25     -1 |       9     14
gfz   uuuuu |     -80      -4     196    -107     -5 |      11     17
grg   uuuux |      92      27    -171      39   -107 |     -44     74
igr   xxxxx |       7     -31     133     -62     -5 |      -1     12
irf   xxxxx |      13     -14     -12     -43     -7 |       6     14
jpl   uuuuu |     -44     -10      87     132     11 |      18     24
mit   uuuuu |      24     -15    -100    -138     -6 |      19     23
ngs   uuuuu |       9      38      43      -9      3 |       9     14
sio   uuuuu |     110     126    -321      96     -8 |      33     36



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