[IGSREPORT-20743] Wk 1681 IGS Final Orbits Resubmission

IGS ACC igs.acc at noaa.gov
Mon Apr 16 08:54:48 PDT 2012


Author:  AC Coordinator / NOAA NGS

sum-file Version 2.0
Final IGS Orbit Combination - Week 1681   (Mar 25, 2012 - Mar 31, 2012)

Contacts: J. Griffiths (jake.griffiths at noaa.gov)
          K. Choi (kevin.choi 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:

igs1681[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1681[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1681[0-6].cls  IGS GPS clock combination summary report.
igs16817.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs16817.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  |  COD   | 4 8 9 27 4 8 9 27 KOUC WILL
                0  |  ESA   | AREQ BRST AREQ BRST NNOR
                0  |  GFZ   | 8 9 27 30
                0  |  GRG   | ONSA
                0  |  JPL   | 8
                0  |  MIT   | 11 11
                1  |  COD   | 4 9 4 9 SUTM
                1  |  ESA   | AREQ CEDU AREQ CEDU PALM
                1  |  GFZ   | 4 8 9 30 WES2
                1  |  GRG   | ONSA
                1  |  JPL   | 8
                1  |  MIT   | 3 22 27 22 27
                2  |  ALL   | 22
                2  |  COD   | 4 9 27 4 9 27 WILL
                2  |  ESA   | AREQ AREQ NNOR
                2  |  GFZ   | 4 8 27 HARB
                2  |  GRG   | ONSA
                2  |  JPL   | 9
                2  |  MIT   | 11 22 11 CAS1 DAV1
                3  |  COD   | 9 27 9 27
                3  |  EMR   | 4 4
                3  |  ESA   | AREQ CAS1 TIXI AREQ DAV1 NNOR TIXI
                3  |  GFZ   | 4 9 27 30 TIXI
                3  |  GRG   | ONSA
                3  |  JPL   | 8 9 30
                3  |  MIT   | CAS1 DAV1 WAB2
                4  |  COD   | 9 27 9 27
                4  |  EMR   | 4 8 4 8
                4  |  ESA   | AREQ AREQ DUBO UNSA
                4  |  GFZ   | 8 9 MCM4
                4  |  GRG   | SPT0
                4  |  JPL   | 4
                4  |  MIT   | CAS1
                5  |  COD   | 9 27 9 27
                5  |  EMR   | 4 8 4 8
                5  |  GFZ   | 9 27 HOLM SANT
                5  |  GRG   | ONSA
                5  |  JPL   | 4 8
                5  |  MIT   | 31 CAS1
                6  |  COD   | 9 27 9 27 WILL
                6  |  ESA   | AREQ AREQ MATE POTS UNSA
                6  |  GFZ   | 9 27
                6  |  GRG   | ONSA
                6  |  JPL   | 8
                6  |  MIT   | CAS1 MAW1

 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 current IGS reference frame. These rotations were
    estimated in the IGS SINEX combination process, performed by the IGS Reference
    Frame Coordinator at the Institut Geographique National (IGN). 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  |    -.4    -.3   -1.0     -56      0     -1     .17
       EMR  |    2.9   -3.8    9.1      -4      8     13     .70
       ESA  |    3.3     .9     .3      35   -137    127     .42
       GFZ  |   -1.0     .4    -.7     -45     27    -27     .23
       GRG  |   -1.1    -.9     .4     -59     43    -14     .32
       JPL  |   -5.1    -.9    9.5      -5    -28     26     .49
       MIT  |    6.1   -5.1   11.7     -47     31    -51     .50
       NGS  |    3.2   -2.1   13.8     -65      7     14     .58
       SIO  |   -2.4   -4.1   -5.1     -24    -54    125     .85


 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 did not use IGS08/igs08.atx until GPS Week 1649, which
    caused their RMS clock residuals to be higher during that period than for
    the other centres; since GPS Week 1632 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 1.1681.a). It also displays the computed satellite
position sigmas for the combined orbits (table 1.1681.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 2.1681.[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 3.1681.[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 5.1681.0-6).

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 1681 summary.                       (Mar 25, 2012 - Mar 31, 2012)

Table 1.1681.a   GPS week: 1681   MJD: 56011.000-56017.000

         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  261|    0     0     0    42   -30     6  -.26   10    9 |    -590    -176     21     87
        |    0     0     1    11    14    20   .02           |     642    1220
emr   94|    0    -1     2   -29   -22   -38   .44   22   22 |    5004    -431     16    108
        |    1     1     2    17    21    18   .03           |     664    1041
esa  135|    0     0    -1  -114   179     9   .26    9    9 |    -385     787     49   1219
        |    0     0     1    18    16    21   .02           |    1106     823
gfz  191|    0     0    -1    28   -95   -18  -.23   13   13 |     276    -299     29    133
        |    1     1     2    83    49     8   .02           |     245     778
grg  123|    0     2    -3    55  -102   -24   .61   17   16 |      37    -155     51    217
        |    0     0     2    13    16    15   .03           |     407     838
igr  n/a|    0     0    -1   -56   -25   -32  -.09    6    5 |   11795   -1364     24    161
        |    0     0     0    18    17    16   .03           |    2428    1254
jpl  149|    0    -1    -2   -41    32    24   .55   17   17 |    2263    -440     24    107
        |    1     1     2    14    11    38   .02           |     757    1111
mit  275|    0     0     0    27   -76   -31  -.36   11   10 |     -48    -107     22    126
        |    0     0     0    28    24    20   .01           |     367     822
ngs  229|    0     1     4    73   -46   -11  -.27   12   10 |   47353  149819   1935   3726
        |    1     0     1    37    24    16   .03           |  474424  918031
sio  233|   -1     0     1   -19    75    94  -.22   20   19 |     ---     ---    ---    ---
        |    1     0     0    32    24    16   .02           |     ---     ---


Table 1.1681.b   GPS week : 1681   MJD: 56011.000-56017.000   

         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  |    5    5    4    5    5    4    6 |
   2  |    5    5    5    5    5    5    6 |
   3  |    4    4    4    3    3    4    4 |
   4  |    5    6    6    6    6    7    6 |
   5  |    5    5    5    5    5    6    6 |
   6  |    4    3    3    3    3    4    4 |
   7  |    5    4    4    4    4    4    4 |
   8  |    6    6    6    6    6    7    7 |
   9  |    7    7    6    6    6    5    5 |
  10  |    4    4    4    4    4    4    4 |
  11  |    5    5    4    4    4    4    5 |
  12  |    5    5    5    5    5    5    5 |
  13  |    5    4    4    5    4    4    5 |
  14  |    6    5    5    5    5    5    5 |
  15  |    6    5    5    5    5    5    5 |
  16  |    5    5    5    4    5    4    5 |
  17  |    6    5    5    5    6    6    7 |
  18  |    5    5    5    5    5    5    5 |
  19  |    5    5    4    4    5    5    5 |
  20  |    5    5    4    5    5    5    5 |
  21  |    6    4    5    5    6    4    4 |
  22  |    5    5    5    5    5    5    5 |
  23  |    5    4    4    4    5    4    5 |
  24  |    0    0    0    0    0    0    0 |
  25  |    5    5    4    4    4    5    4 |
  26  |    5    4    4    4    4    5    5 |
  27  |    6    6    5    5    5    5    6 |
  28  |    5    5    5    5    5    5    6 |
  29  |    6    5    5    5    5    5    6 |
  30  |    4    3    4    3    3    3    4 |
  31  |    5    5    5    4    5    5    5 |
  32  |    5    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 2.1681.0   GPS week: 1681   Day: 0   MJD: 56011.000                            

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  261|    0     0     0    47   -27    -4  -.30   10    9 |     -21    -664     24     98
        |                     13    28                       |
emr   94|   -2     0     5    -9   -18   -55   .42   22   22 |    6356   -2144     16    114
        |                    -22     7                       |
esa  135|    0     0     0  -106   168     7   .26    9    9 |    -459    1005     44   1216
        |                     20   -14                       |
gfz  191|    0     0    -2   -58   -89   -28  -.27   15   14 |     484   -1187     32    137
        |                    -31    22                       |
grg  123|    1     1    -6    53   -90   -10   .61   17   16 |     604   -1188     44    217
        |                    -15   -34                       |
igr  n/a|    0     0     0   -33   -23   -49  -.10    6    5 |   16230   -3527     23    118
        |                     12    42                       |
jpl  149|    1    -1     1   -42    33    71   .55   17   17 |    3804   -2453     25    110
        |                     49    -7                       |
mit  275|    1     0     1    32   -56   -53  -.37   14   11 |     577   -1088     20    151
        |                     24    23                       |
ngs  229|    0     0     2   116   -45   -10  -.23   12   10 |    -135    -697   1543   3380
        |                    -97     5                       |
sio  233|   -2     1     1   -49    89    75  -.22   21   21 |     ---     ---    ---    ---
        |                     22   -27                       |

Table 2.1681.1   GPS week: 1681   Day: 1   MJD: 56012.000                            

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  261|    0     0    -1    54   -16   -17  -.28   10    9 |     249   -2533     23     96
        |                     35   -19                       |
emr   94|    0     0     2   -32   -35   -11   .48   21   21 |    4757   -1364     17     99
        |                     -6    -1                       |
esa  135|    0     0     1   -95   187    40   .23    8    8 |    -971     612     43   1254
        |                      5   -19                       |
gfz  191|    0     0    -4   -70  -143    -9  -.23   13   13 |      67    -457     33    135
        |                    -26    59                       |
grg  123|    0     1    -3    46   -84   -47   .63   16   15 |     -58    -348     62    231
        |                    -18   -45                       |
igr  n/a|    1     0    -2   -46    -4   -42  -.13    6    5 |   13499   -2318     23    105
        |                     18    18                       |
jpl  149|    0     0     0   -50    51     0   .55   17   17 |    1902   -1202     25    113
        |                     11   -25                       |
mit  275|    1     0     0    40   -97   -36  -.35   10    8 |      35   -1085     20    116
        |                      1    22                       |
ngs  229|    0     0     3   108   -18    -4  -.24   12   10 |     435   -2832   2120   3252
        |                     12    49                       |
sio  233|   -2     0     0     5    54    96  -.24   19   18 |     ---     ---    ---    ---
        |                    -14   -49                       |

Table 2.1681.2   GPS week: 1681   Day: 2   MJD: 56013.000                            

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  261|    0     0     0    38   -41    21  -.24   10    9 |   -1498     577     16     68
        |                      6     2                       |
emr   94|    1    -1     4   -22   -50   -21   .45   20   20 |    4366     -14     18     97
        |                    -46   -10                       |
esa  135|    0     0    -1   -93   186   -10   .26    9    9 |    1996    -846     57   1233
        |                     15   -11                       |
gfz  191|    0     2    -1   -16   -14   -11  -.22   14   14 |     499    -136     32    130
        |                    -29    33                       |
grg  123|    0     1    -7    62  -111   -35   .65   18   17 |     -90     294     48    224
        |                    -49   -23                       |
igr  n/a|    1     0    -1   -59   -42   -38  -.10    5    5 |   12333   -1387     26    177
        |                     -4    23                       |
jpl  149|    0    -3    -1   -50    22    60   .56   17   17 |    1890    -181     26    118
        |                     14   -21                       |
mit  275|    0     0     0    21   -67   -43  -.34   10    8 |    -415     598     25    116
        |                      3    10                       |
ngs  229|    0     1     4    75   -82     0  -.27   12    9 |   -1059    -503   1864   3726
        |                     27   108                       |
sio  233|   -1     0     0   -24    73    95  -.22   19   18 |     ---     ---    ---    ---
        |                    -13   -63                       |

Table 2.1681.3   GPS week: 1681   Day: 3   MJD: 56014.000                            

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  261|    0     0     0    22   -38    31  -.23   10    9 |    -373    -694     19     93
        |                     26   -23                       |
emr   94|    2     0     2   -66   -38   -48   .42   20   20 |    4508    -199     14    106
        |                    -24    -8                       |
esa  135|    0    -1     0  -145   169    -8   .24    8    8 |    -774     917     46   1297
        |                     16     2                       |
gfz  191|    0     0    -4   160   -46   -17  -.23   12   11 |     227    -347     28    134
        |                    -12    55                       |
grg  123|    0     2    -3    34   -97   -26   .63   17   15 |     100    -130     49    209
        |                      2   -28                       |
igr  n/a|    0     0    -1   -90   -27   -43  -.07    5    5 |   10809   -1095     22    151
        |                    -21    11                       |
jpl  149|    1    -2    -3   -48    40     3   .55   17   17 |    1486    -282     26    117
        |                    -29   -15                       |
mit  275|    0     0     0    77   -78   -12  -.36   11   10 |      58    -123     22    116
        |                    -12     1                       |
ngs  229|   -1     1     4     3   -74   -11  -.28   11   10 |    -309    -825   1994   3831
        |                     72    54                       |
sio  233|   -1     1     1    35    87    93  -.21   20   20 |     ---     ---    ---    ---
        |                    -44   -82                       |

Table 2.1681.4   GPS week: 1681   Day: 4   MJD: 56015.000                            

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  261|    0     0     0    55   -11   -11  -.24   10    9 |    -320     519     22     89
        |                    -42   -37                       |
emr   94|    0    -1     3   -27   -20   -30   .47   22   22 |    4814    -346     17    121
        |                    -50   -12                       |
esa  135|    0     0    -2  -126   195    -7   .27    9    9 |    -880     972     55   1221
        |                     70     3                       |
gfz  191|    0     0    -2    75  -123   -18  -.22   13   13 |     375    -877     27    137
        |                    -44    62                       |
grg  123|    1     2    -4    77   -99   -12   .58   17   16 |     526   -1231     53    223
        |                    -51   -31                       |
igr  n/a|    0     0    -1   -48    -6   -29  -.10    6    6 |   10527   -1232     26    179
        |                    -48    24                       |
jpl  149|    0    -1    -3   -11    32    52   .57   17   16 |    1949    -339     23     98
        |                    -29   -43                       |
mit  275|    0    -1     0   -14   -89   -30  -.35   11   11 |     118    -466     23    137
        |                      9    -6                       |
ngs  229|   -1     0     5    53   -28     9  -.26   12   10 | -642668 2052756   2111   4124
        |                     -1    59                       |
sio  233|    0     0     1   -58    51    96  -.19   20   19 |     ---     ---    ---    ---
        |                    -17   -84                       |

Table 2.1681.5   GPS week: 1681   Day: 5   MJD: 56016.000                            

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  261|    0     0     2    39   -51    28  -.25   11   10 |   -1152     782     22     83
        |                     26    19                       |
emr   94|    1    -1     2   -24   -10   -64   .46   24   24 |    4962    1092     17    113
        |                    -42   -58                       |
esa  135|    0     0    -4  -122   151    36   .29    8    7 |   -1341    1901     53   1135
        |                     26     6                       |
gfz  191|    1     0     0    77  -108   -31  -.22   13   12 |     438    -360     28    140
        |                    -40    84                       |
grg  123|    0     2    -2    55  -134   -34   .58   17   16 |    -348     540     56    223
        |                    -23     8                       |
igr  n/a|    0     0    -1   -49   -53   -24  -.06    5    5 |    9870      61     26    170
        |                    -19    57                       |
jpl  149|    0    -2    -3   -31    15    13   .56   18   17 |    2236     942     25    102
        |                     28   -55                       |
mit  275|    0     0     0    22   -38   -47  -.37   11   10 |    -201     401     22    125
        |                     12   -14                       |
ngs  229|   -3     2     6    74   -50   -25  -.30   12   11 |  976290 -999999   1989   4125
        |                    -19    34                       |
sio  233|    1     1     1   -15   117    76  -.25   19   18 |     ---     ---    ---    ---
        |                    -21  -101                       |

Table 2.1681.6   GPS week: 1681   Day: 6   MJD: 56017.000                            

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  261|    0     0     1    37   -25    -5  -.27   12   10 |   -1021     778     22     87
        |                     39   -10                       |
emr   94|    0    -2    -1   -24    14   -37   .41   22   22 |    5267     -46     19    109
        |                    -42   -47                       |
esa  135|    1     0     0  -107   197     6   .27    9    9 |    -271     954     50   1181
        |                     32     6                       |
gfz  191|    3     2     2    33  -144    -9  -.20   16   15 |    -156    1269     27    121
        |                    -25    63                       |
grg  123|    2     2     1    59   -98    -7   .60   16   15 |    -469     973     49    193
        |                    -38   -15                       |
igr  n/a|    0     0    -2   -65   -21    -2  -.05    6    5 |    9299     -50     24    232
        |                    -14    52                       |
jpl  149|   -1    -3    -5   -51    34   -32   .50   18   17 |    2579     433     24     92
        |                    -26    37                       |
mit  275|    0    -1    -1    12  -109     3  -.36   12   11 |    -511    1014     28    122
        |                     11    10                       |
ngs  229|    0     0     2    79   -26   -39  -.28   12   11 |   -1078     838   1928   3648
        |                     -1   -40                       |
sio  233|    0     0     0   -31    54   126  -.21   22   20 |     ---     ---    ---    ---
        |                    -23   -66                       |

       
       
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 3.1681.0   GPS week: 1681   Day: 0   MJD: 56011.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   14   24   12   12   16    4   12    7   13   11    4 |    23   30   33   28   37   25   33   23   26   30    26
   2E |    7   29    7   16   22    6   21   11   14   12    5 |    26   36   27   27   39   24   31   24   28   25    27
   3  |    8   16    8    7   12    7   12   10    7   19    3 |    18   22   23   21   26   18   24   19   18   21    20
   4E |   11   20    9   11   12    6   18   19   17   23    5 |    62   63   65   65   64   62   59   60   68   59    61
   5  |    8   20    7   18   16    6   22    9   11   22    5 |    15   28   19   24   30   15   23   19   18   18    17
   6  |   10   15    8    8    9    6   11    9    9   17    3 |    18   20   22   22   22   17   21   21   16   22    19
   7E |    6   17   13   14   15    5   16   15   12   13    4 |    17   24   20   19   24   16   22   20   22   19    18
   8E |   17   24   10   16   20   10   23   12   21   17    6 |    23   29   26   27   25   23   25   33   36   29    24
   9E |   16   20   10   21   20    8   20   31   19   24    7 |    52   57   52   51   62   51   64   51   46   57    51
  10  |    8   18    8   11   16    3   15    9    8   12    3 |    24   21   23   30   30   23   15   28   26   23    23
  11  |    6   19   10   17   21    3   11   10   12   20    4 |    15   29   22   22   34   16   24   17   19   25    17
  12  |    8   28    7   14   16    7   19   15   10   22    5 |    28   33   31   26   31   26   30   35   28   29    28
  13  |    7   21    7   14   18    6   13   15   10   19    4 |    25   33   28   32   38   26   33   27   26   25    26
  14  |    9   25   10   16   13    7   16   16    9   34    5 |    28   33   32   36   36   28   32   35   26   38    29
  15  |   11   28    7   11   17    9   22   11   15   28    5 |    21   36   25   30   37   25   30   26   23   27    23
  16  |    9   27    8   11   15    4   20    8   10   21    4 |    17   29   23   23   28   16   26   21   20   20    19
  17  |    8   25    9   16   13    7   20   15   12   32    5 |    22   33   21   27   24   22   31   21   23   28    20
  18  |    9   28   10   14   20    6   23   10   10   17    5 |    22   34   25   28   33   22   31   25   27   26    22
  19  |    8   24   11   11   12    7   18    9   10   24    4 |    20   31   17   17   22   16   32   15   19   19    18
  20  |    8   22    8   10   21    3   15   17    9   18    4 |    16   31   23   23   30   17   27   20   22   18    19
  21E |    7   19    7   15   37    5   16    9   12   12    5 |    29   33   26   27   41   28   32   31   30   32    27
  22  |    9   21   12   11   18    4   17   11   10   17    4 |    22   24   26   26   31   20   22   24   22   26    20
  23  |    6   21    7   19   16    5   12    7    9   25    4 |    29   35   33   38   37   31   33   31   32   28    31
 X24  |    5  ---  ---  ---  ---   40  ---  ---  ---  ---    0 |    26  ---  ---  ---  ---   24  ---  ---  ---  ---    26
  25  |    9   19   11   14   10    4   15   13   13   14    4 |    29   34   31   25   35   28   37   35   24   28    28
  26  |   11   27    6   13   14    5   15    7   12   18    4 |    16   33   19   22   28   18   22   17   11   16    16
  27E |   12   17   12   16   16    8   20   22   12   26    5 |    49   52   50   54   61   50   62   40   45   60    49
  28  |   11   27    7   15   19    5   17   11   11   28    5 |    20   31   27   29   36   21   26   28   30   30    24
  29  |   12   25   14   13   20    7   20    9   13   35    6 |    16   32   21   19   23   19   33   21   23   27    19
  30  |    8   20    8    9   13    5   11   12    9   11    3 |    15   26   17   17   17   17   23   21   20   16    17
  31E |    9   19    9   11   16    3   15   21    8   13    4 |    21   28   23   21   26   22   26   24   24   20    22
  32  |    8   22    8   29   18    4   16   14    6   14    5 |    16   21   24   36   31   18   24   21   20   19    20
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   22    9   15   17    6   17   14   12   21      |T   24   32   27   28   33   24   30   26   26   27    25
 WRMS |    9   22    9   14   16    5   17   11   10   21      |NE  20   29   24   26   29   21   27   23   22   24    21
 MEDI |    8   21    8   14   16    6   16   11   11   19      |MD  22   31   25   27   31   22   30   24   24   26    22

Table 3.1681.1   GPS week: 1681   Day: 1   MJD: 56012.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   17   19   13   11   18    5   11    9   17   11    5 |    22   33   33   25   35   23   32   21   24   27    25
   2E |    7   27    9   14   19    8   23   12   10   13    5 |    17   30   21   18   23   14   25   19   20   19    17
   3  |   12   14    7   10   12    6   11    5    8   17    3 |    17   23   22   19   22   18   22   19   22   18    19
   4E |   12   21    9   14   17    8   18   15   22   24    5 |    50   46   47   49   48   48   47   45   55   46    47
   5  |    8   21    6   18   19    5   18    8    8   15    4 |    15   29   19   17   28   13   23   14   17   15    15
   6  |    9   14    8    7    9    6   10    5   10   15    3 |    15   22   19   15   20   16   21   18   19   17    17
   7E |    7   17    8   12   12    3   16    9    9   10    3 |    16   21   17   19   21   14   21   18   15   18    15
   8E |   16   20    9   15   14    7   24   12   23   15    5 |    17   22   20   20   18   17   23   26   33   22    18
   9E |   15   25   14   17   19    7   24   26   18   24    7 |    41   56   44   43   53   40   58   38   40   52    43
  10  |    7   14    6   10   17    5   11   10    9   12    3 |    25   17   19   25   23   21   15   23   22   18    20
  11  |    8   13   10   15   20    3    9    8   15   16    4 |    15   25   19   14   33   13   22   12   21   16    15
  12  |    8   27    7   16   15    7   20   14   10   23    5 |    28   36   31   30   35   27   34   29   29   26    28
  13  |    5   19    7   12   18    4   13    9    6   16    4 |    18   29   17   18   32   17   29   18   16   17    17
  14  |    9   21   10   15   14    6   14   11   14   29    5 |    18   26   22   28   29   18   26   24   21   29    20
  15  |    9   23    9   16   16    8   22    7   10   25    5 |    20   34   22   23   33   23   31   19   23   17    20
  16  |   10   23   11    8   15    4   19    8    9   19    4 |    18   26   22   14   23   15   24   16   21   15    16
  17  |    8   22    9   17   12    7   20   11    9   28    5 |    23   27   20   25   23   21   29   22   24   27    20
  18  |    9   24    8   13   18    5   19    9   11   17    4 |    26   34   24   27   32   26   33   27   27   28    25
  19  |    9   23   10   10   14    9   17    6   10   21    4 |    14   27   17   13   21   14   26   13   18   12    14
  20  |   10   19    8   14   19    5   16    9   13   13    4 |    12   26   18   21   27   13   23   17   19   15    15
  21E |    8   21    7   13   16    4   17    6   13   11    4 |    29   34   22   30   31   26   35   30   25   29    25
  22  |    8   22    9   12   18    5   14   10   11   18    4 |    22   27   22   24   28   20   25   23   20   26    20
  23  |    7   20    7   13   15    4   12    5   13   21    4 |    19   32   20   22   31   19   26   21   21   19    19
 X24  |    5  ---  ---  ---  ---   30  ---  ---  ---  ---    0 |    19  ---  ---  ---  ---   22  ---  ---  ---  ---    19
  25  |    8   19    9   14   14    5   14   15   14   17    4 |    30   35   30   24   39   25   38   28   30   27    28
  26  |   11   14    6   14   15    5   15    8   10   17    4 |    20   23   17   22   24   16   21   18   17   17    17
 X27E |   11   19    7  ---   17    8   21   18   12  ---    6 |    39   48   43  ---   47   40   55   36   35  ---    40
  28  |   11   23    7   13   15    4   17   11   13   23    4 |    16   30   20   23   27   18   25   18   24   21    18
  29  |   15   23    7   11   18    4   21    7   11   28    5 |    18   27   18   17   18   16   28   16   24   22    16
  30  |    8   14    5    9   13    6   10    7    9   11    3 |    14   19   16   17   17   14   19   18   20   17    15
  31E |    9   22    9   11   19    6   17   11    8   14    4 |    17   24   17   18   23   15   24   20   19   20    16
  32  |   12   21    7   12   19    3   16    7   10   11    4 |    19   23   22   25   25   19   23   23   21   23    19
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   21    8   13   16    6   17   10   12   19      |T   21   29   23   22   28   20   28   22   23   22    21
 WRMS |    9   21    8   13   15    5   17    8   10   18      |NE  19   27   20   21   26   18   25   19   21   20    18
 MEDI |    9   21    8   13   16    5   17    9   10   17      |MD  18   27   20   22   27   18   25   20   21   19    19

Table 3.1681.2   GPS week: 1681   Day: 2   MJD: 56013.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   10   20   11   14   16    5   13    8    8   14    4 |    26   37   35   30   38   27   36   25   25   31    28
   2E |   10   27    8   16   18    5   23   11   15   11    5 |    20   32   20   21   38   20   28   24   26   26    21
   3  |   11   13    7   10   16    4   10    5    7   17    3 |    13   22   18   20   20   14   22   14   19   16    15
   4E |   12   21    8   14   15    6   18   15   21   22    5 |    38   42   36   37   41   39   39   39   44   40    37
   5  |    7   22   10   22   22    4   16    9   15   21    5 |    16   27   18   23   35   16   24   19   18   19    17
   6  |    8   12    8   11   15    3    9    3    7   15    3 |    11   21   20   20   23   14   21   17   19   17    16
   7E |    8   15   10   12   14    4   16    8   10   10    3 |    22   26   25   19   23   19   26   21   27   20    22
   8E |   19   22   11   19   24    7   22   11   22   16    6 |    21   23   21   26   23   22   22   29   37   24    22
   9E |   17   21   13   14   24    6   22   18   12   25    6 |    44   53   46   39   59   41   58   36   39   51    43
  10  |    7   15    6   14   21    5   14    7   13   11    4 |    18   18   16   25   26   18   15   22   22   19    18
  11  |    8   15   10   15   21    6   12    7    7   18    4 |    15   27   24   22   32   16   26   14   20   19    17
  12  |    8   26    9   13   15    5   21   16   11   23    5 |    26   36   30   26   36   26   33   27   25   22    25
  13  |    8   21    9   14   18    4   15    7    9   18    4 |    17   35   24   24   34   20   32   19   23   22    21
  14  |    8   25   11   19   12    5   17   11   13   26    5 |    21   27   29   30   32   22   28   27   19   29    23
  15  |   12   26   10   16   18    8   20   10   10   23    5 |    22   33   23   26   37   23   30   20   19   20    20
  16  |   10   26   10   10   14    4   21    9   12   19    4 |    13   27   18   19   24   13   24   15   18   14    14
  17  |   10   18    9   16   14    5   19    7   12   26    4 |    24   30   24   18   22   21   29   20   26   21    21
  18  |    7   23   10   10   18    5   17    8   14   16    4 |    19   31   26   20   32   17   27   21   23   23    21
  19  |    9   20    9   11   13    6   17    8   10   22    4 |    17   30   17   17   21   14   29   15   20   15    16
  20  |   10   22    7   13   17    3   17   10    9   12    4 |    15   31   21   20   29   16   27   20   16   17    17
  21E |    7   18    9   15   35    5   16    8   11   11    5 |    27   30   30   21   49   23   31   24   25   28    27
  22  |    7   21   10   11   22    4   18   11    8   19    4 |    16   25   23   20   30   17   25   23   18   23    18
  23  |    8   20    7   16   14    4   13   11    7   22    4 |    19   34   24   26   32   23   31   23   20   23    22
 X24  |    5  ---  ---  ---  ---   24  ---  ---  ---  ---    0 |    22  ---  ---  ---  ---   18  ---  ---  ---  ---    20
  25  |    7   17    7   14   13    4   16   12   10   18    4 |    18   30   26   20   36   20   35   20   17   17    20
  26  |   13   12    5   10   19    4   11    6   11   20    4 |    23   24   19   20   28   18   20   22   24   15    20
  27E |   14   16    9   10   16    4   20   12   12   25    5 |    42   47   42   41   54   38   55   35   35   55    41
  28  |   11   20   10   12   15    4   17    7   11   25    4 |    21   30   26   25   31   21   26   25   25   25    22
  29  |   12   21    9   13   14    5   20    7   11   26    5 |    18   31   21   14   27   18   30   19   21   26    20
  30  |    7   16    5   12   12    4   13    6    8   12    3 |    14   24   17   14   19   16   24   17   18   18    16
  31E |    8   28    7   15   21    6   22    9   10   12    5 |    11   26   16   18   24   14   24   17   16   16    14
  32  |   11   19    6   14   16    3   17    7   11   12    4 |    12   21   17   18   24   14   22   18   14   18    14
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   20    9   14   18    5   17   10   12   19      |T   20   30   24   23   31   20   29   22   23   23    21
 WRMS |    9   20    9   14   17    5   17    8    9   18      |NE  17   27   21   21   28   18   26   19   20   19    18
 MEDI |    8   20    9   14   16    5   17    8   11   18      |MD  19   30   23   21   31   18   27   21   21   21    20

Table 3.1681.3   GPS week: 1681   Day: 3   MJD: 56014.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   15   21   10   11   22    5   14   10   10   15    4 |    29   35   34   27   41   29   40   27   25   34    29
   2E |    8   26    6   13   23    4   24   13   11   15    5 |    20   33   21   23   28   21   29   24   20   25    20
   3  |    9   14    7    9   12    5    8    7   10   16    3 |    21   26   27   23   27   21   27   20   23   21    22
   4E |   15   21    9   13   18    7   20   18   19   25    6 |    38   47   39   41   46   40   44   41   47   40    39
   5  |    7   20    5   21   17    7   21   10   12   19    5 |    16   27   19   26   27   17   27   15   17   16    15
   6  |    8   14    7    9   11    4   10    7    9   14    3 |    18   22   24   21   26   18   24   21   19   18    19
   7E |    7   16   10    8   15    4   17    5   12   11    4 |    16   22   21   18   22   18   24   16   18   19    16
   8E |   19   21    8   14   18    5   21   14   16   20    5 |    15   21   20   21   15   17   20   26   26   24    16
   9E |   12   21   10   11   15    6   22   17   13   26    5 |    50   61   52   49   60   52   65   46   46   59    51
  10  |   10   15    6   10   20    5   13    8    9   14    3 |    20   21   18   26   26   21   20   25   23   20    19
  11  |    8   16    7   13   21    5   11    9   12   17    4 |    17   28   19   18   32   16   24   16   17   17    15
  12  |   10   26    6   11   14    9   21   16   14   25    5 |    25   36   28   28   33   28   27   32   27   27    25
  13  |    6   21    9   11   19    3   15    7   12   21    4 |    22   33   24   27   37   22   33   21   23   20    21
  14  |    9   22    8   15   11    5   18   10   12   24    4 |    24   28   29   35   34   27   31   29   20   31    25
  15  |    7   27    7   15   14    6   22   10   12   22    5 |    20   32   25   30   34   22   28   21   16   20    20
  16  |    6   25    5   10   13    4   20    7    7   21    4 |    14   27   21   19   27   18   24   16   18   16    16
  17  |   15   19    8   15   13    4   19   11    9   27    5 |    26   32   27   28   30   27   33   26   25   26    24
  18  |    9   26    8   12   18    6   19    9   12   16    4 |    31   38   31   29   38   29   35   29   30   29    29
  19  |    8   22    9   11   12    4   15    8   12   22    4 |    16   29   20   15   22   16   28   14   18   15    15
  20  |    9   23   13   13   20    4   18   10   12   14    5 |    16   29   21   19   30   18   26   19   17   18    16
  21E |    7   22    6   12   28    6   13   11   12   14    4 |    24   33   24   23   31   25   30   27   23   28    23
  22  |    7   22   12   12   17    4   15   12   12   19    4 |    21   28   22   26   30   22   24   24   18   25    19
  23  |    7   20    7   10   15    4   18    9    7   24    4 |    23   32   25   27   33   24   32   25   22   22    22
 X24  |    4  ---  ---  ---  ---   33  ---  ---  ---  ---    0 |    29  ---  ---  ---  ---   20  ---  ---  ---  ---    28
  25  |    7   17    9   12   14    6   14   14   10   22    4 |    25   34   28   27   38   28   36   32   27   29    27
  26  |   12   11    7   12   16    4   14   10   10   19    4 |    15   19   20   23   27   17   22   16   12   16    15
  27E |   12   18   11   10   16    6   19   12    9   26    5 |    45   54   50   43   55   45   59   40   41   55    46
  28  |   13   22   10   12   14    5   15    9    9   26    4 |    20   30   26   28   31   23   25   26   24   26    22
  29  |   13   19    7   10   16    7   20   10    9   27    4 |    16   28   18   18   20   17   30   18   17   20    16
  30  |    7   15    8    7   13    3   12    7   11   11    3 |    10   20   13   15   14   10   18   12   15   10    11
  31E |    8   22    8    9   13    5   18    9   11   13    4 |    14   24   17   18   20   13   22   16   16   14    13
  32  |    9   21    5   10   17    5   15    8   10   12    4 |    13   20   18   16   25   17   22   20   13   19    14
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   20    8   12   17    5   17   11   11   20      |T   22   30   25   25   30   23   29   23   22   24    22
 WRMS |    9   20    8   11   15    5   17   10   10   20      |NE  19   28   22   23   29   20   27   21   20   20    19
 MEDI |    8   21    8   11   16    5   18   10   11   19      |MD  20   29   24   26   30   21   27   24   20   21    20

Table 3.1681.4   GPS week: 1681   Day: 4   MJD: 56015.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   15   21   12   14   15    4   11   16    9   14    5 |    29   39   37   28   44   29   41   33   33   35    33
   2E |    9   27    9   13   24    6   21   11    9   17    5 |    15   28   21   21   23   17   23   19   18   25    17
   3  |    6   13    8   11   10    5    9    6    8   14    3 |    14   24   22   20   20   16   22   17   21   15    17
   4E |   17   24   11   12   20    7   19   18   21   24    6 |    87   95   93   92   91   92   93   90   95   95    91
   5  |    6   22    9   19   19    5   19   16   11   19    5 |    15   29   21   20   27   16   25   18   20   18    17
   6  |    6   13    8   10   10    5   10    8   11   12    3 |    16   23   22   20   20   18   21   20   24   17    19
   7E |    6   16    8   11   10    7   16    5   10   11    3 |    11   20   19   19   18   14   20   15   17   17    14
   8E |   17   19   11   14   17    8   23   15   19   20    6 |    16   22   20   24   18   18   22   27   30   26    19
   9E |   11   20   14   11   18    5   21   14   12   24    5 |    47   55   48   49   55   45   59   42   43   56    47
  10  |    8   15    6   11   20    5   12   10    6   14    3 |    20   22   19   28   20   21   16   26   25   24    20
  11  |   11   20    7    9   20    6    9    9    8   18    4 |    11   29   19   13   32   14   23   12   17   14    14
  12  |   10   28    7   13   14    5   23   14   11   22    5 |    21   31   24   23   27   21   27   26   19   20    21
  13  |    6   20    8   12   16    6   16    9   11   22    4 |    17   32   23   23   33   20   31   19   18   22    19
  14  |    8   24   10   15   13    6   16   11   14   22    5 |    18   26   28   29   30   21   27   26   17   25    21
  15  |   10   26   11   15   16    7   21   11   12   24    5 |    19   29   24   26   31   20   27   19   18   16    18
  16  |    6   25    9   11   16    6   20   10   10   20    4 |    16   28   21   18   27   17   26   17   20   17    17
  17  |   14   22   11   14   11    6   19   15   11   33    5 |    19   28   22   22   20   21   28   27   26   34    21
  18  |    7   26   10   16   16    6   17   11   19   16    5 |    21   36   25   23   30   22   31   24   27   26    22
  19  |    7   26   11   11   10    7   18    9   12   23    4 |    11   31   21   16   20   13   27   13   17   12    15
  20  |   11   29    5   13   17    4   16   10   10   13    4 |    14   31   19   19   27   15   25   19   17   18    16
  21E |    8   20   11   14   45    9   13   12   13   17    6 |    22   29   29   26   41   26   29   27   24   26    23
  22  |    7   23   12    9   17    3   16   14   13   17    4 |    16   28   22   18   25   16   23   21   19   22    17
  23  |    7   28    8   15   14    4   14    7   12   24    4 |    14   33   23   25   30   18   28   20   15   19    18
 X24  |    5  ---  ---  ---  ---   32  ---  ---  ---  ---    0 |    16  ---  ---  ---  ---   20  ---  ---  ---  ---    18
  25  |    7   20    6   11   12    4   15   11   10   18    4 |    17   30   27   16   30   21   34   21   20   21    21
  26  |    9   12    7   15   16    7   14   11    9   17    4 |    13   16   19   23   25   16   21   13   17   13    15
  27E |   12   21   11   12   17    6   19    9   12   24    5 |    41   50   46   42   50   43   55   37   43   58    43
  28  |   12   20   10    9   17    4   20   13    9   25    5 |    17   25   25   23   29   19   24   26   22   24    20
  29  |   16   20    6   14   17    6   18   11    9   30    5 |    15   25   17   18   16   15   25   16   18   20    14
  30  |    7   12    8    8   11    5   10    6    8   10    3 |    11   20   16   15   16   12   20   13   16   13    13
  31E |    7   28    9   11   15    5   19    9    9   16    4 |     8   25   13   12   18    9   20   13   16   14    11
  32  |    9   22    5    9   15    4   15    7   12   11    4 |    11   19   18   14   23   13   19   19   14   19    13
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   22    9   13   17    6   17   11   12   20      |T   19   30   25   24   29   21   29   23   24   25    22
 WRMS |    9   22    9   13   16    6   16   11   10   19      |NE  15   27   21   20   25   17   25   19   19   19    17
 MEDI |    8   21    9   12   16    6   16   11   11   18      |MD  16   28   22   22   27   18   25   20   19   20    18

Table 3.1681.5   GPS week: 1681   Day: 5   MJD: 56016.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   10   26    7   12   19    3   13   11   10   11    4 |    26   35   35   25   39   28   36   27   29   33    29
   2E |    9   28   10   15   18    5   21   16   12   17    5 |    23   33   25   24   29   21   29   28   20   25    22
   3  |   13   17    7   10   14    4   11    6   11   13    3 |    21   21   23   16   23   16   25   16   16   16    18
   4E |   31   24   11   13   18    8   19   17   19   25    7 |    99  103  104  108  103  107  103  111  104  111   103
   5  |    9   22   10   13   21    5   19   21   16   19    5 |    14   27   18   19   27   15   25   19   20   16    15
   6  |    9   20    5    9   12    4   10    8    9   12    3 |    17   19   20   16   22   15   24   18   16   16    17
   7E |    8   19    8   12   12    5   18    6   13   10    4 |    14   22   18   16   17   15   24   15   20   17    14
   8E |   18   28   10   19   24    7   23   12   23   19    6 |    21   27   20   28   20   24   24   29   38   27    22
   9E |   11   21    8   10   26    6   21   10   14   25    5 |    38   52   43   41   51   41   57   38   37   54    42
  10  |    7   18    6    8   20    5   15    8   11   13    3 |    24   24   24   28   24   23   20   31   28   28    24
  11  |    6   24    6   12   24    3   12    8    8   18    4 |    15   33   20   16   37   15   26   16   15   15    16
  12  |   10   30    7   13   19    3   22   10    9   21    5 |    24   34   23   23   33   23   28   22   22   23    21
  13  |    7   22    7   11   16    5   16    9   11   21    4 |    21   36   24   21   34   21   34   22   26   24    22
  14  |    7   26    8   17   12    5   16   11   10   23    4 |    17   28   18   25   27   20   25   22   17   23    18
  15  |   11   26    5   10   18    4   23   13   15   23    5 |    21   32   23   20   31   20   30   20   16   17    19
  16  |    7   25    6   13   17    6   18    7    8   21    4 |    15   26   19   19   29   15   25   15   16   15    16
  17  |   14   29    9   15   13    5   21    8   12   30    5 |    29   39   30   32   36   28   37   31   33   38    29
  18  |    9   33    7   14   16    7   19   12   13   17    5 |    30   46   34   35   41   32   40   34   31   36    32
  19  |   10   27    9   11   14    7   18    8   16   21    4 |    11   31   21   14   21   14   27   15   19   12    15
  20  |    9   30    5   17   15    5   18   11   11   12    4 |    17   31   20   21   30   18   29   21   22   20    19
  21E |    9   20    4   11   18    5   15    6   13   13    4 |    29   38   31   34   35   32   37   34   28   36    30
  22  |    7   27    9   14   19    5   15   11   11   17    4 |    16   27   18   21   28   16   24   21   17   24    16
  23  |    6   22    6   15   14    4   15    8    8   24    4 |    19   31   24   22   30   21   31   21   23   20    21
 X24  |    6  ---  ---  ---  ---   38  ---  ---  ---  ---    0 |    21  ---  ---  ---  ---   13  ---  ---  ---  ---    19
  25  |    9   21   11   13   17    5   14   12    8   17    4 |    22   33   28   21   37   24   36   22   21   21    23
  26  |   12   17    8    9   19    5   16    9   12   19    4 |    17   19   18   16   23   14   21   18   19   13    15
  27E |   11   23    8   10   14    6   20   11   14   27    5 |    43   54   48   42   50   46   59   44   42   60    46
  28  |   13   27    8   11   18    4   20   10   11   25    5 |    20   32   25   24   34   21   28   28   28   28    23
  29  |   14   22    4   14   17    6   22    7    9   30    5 |    18   32   23   23   24   22   32   23   21   29    21
  30  |    7   17    6   11   13    4   11    6   10   10    3 |     9   21   12   12   18   10   19   11   15   12    10
  31E |    7   26    8   14   13    7   18   12   10   10    4 |    14   25   21   15   22   16   22   18   18   20    15
  32  |    9   23    8   13   15    5   16    9    7   11    4 |    16   25   20   17   20   14   24   20   17   20    16
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   11   24    8   13   17    5   18   11   12   19      |T   23   33   26   25   32   23   32   26   25   27    24
 WRMS |   10   24    7   12   16    5   17   10   11   18      |NE  18   29   22   20   28   18   27   21   20   21    19
 MEDI |    9   24    8   13   17    5   18   10   11   19      |MD  20   31   23   21   29   20   28   22   21   23    19

Table 3.1681.6   GPS week: 1681   Day: 6   MJD: 56017.000                            

        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
------+--------------------------------------------------------+---------------------------------------------------------
   1E |   27   25   10   21   16   11   18   13   15   11    6 |    61   58   59   47   66   50   59   54   61   56    56
   2  |    8   28    8   16   15    5   22   14   13   24    5 |    29   35   30   29   31   24   32   24   28   28    26
   3  |   10   17    8   10   12    4   12    9   10   16    4 |    20   24   25   26   25   21   25   21   19   23    21
   4E |   17   22   11   16   18   10   16   15   16   27    6 |   144  149  144  139  148  140  147  143  150  138   144
   5  |    6   22   11   17   17    6   20   21   12   24    5 |    17   29   19   19   26   16   26   18   20   19    16
   6  |    5   18    6   10   10    5   13    9   11   16    3 |    24   24   27   28   25   23   25   24   20   24    23
   7E |    9   21    8   14   15    6   18    6   11   11    4 |    16   18   18   17   16   12   18   13   19   16    14
   8E |   27   24   12   18   21   10   24   16   21   18    7 |    24   24   25   24   19   23   25   25   30   24    21
   9E |   10   22    8   16   16    6   21   10   11   29    5 |    61   72   60   59   70   61   77   56   56   67    61
  10  |    9   20   10   14   14    3   13   13    9   14    4 |    21   22   21   23   23   18   18   25   20   17    19
  11  |    9   20    6   13   20    5   13   11    9   20    4 |    14   26   23   12   38   15   26   16   18   14    17
  12  |   11   29    9   14   14    6   23   10   11   23    5 |    27   38   28   28   34   27   34   27   29   24    26
  13  |    8   20    9   15   16    6   16   11   11   22    4 |    24   36   30   28   39   24   37   21   25   22    26
  14  |    7   24    9   20   11    5   15   11   13   21    4 |    26   32   30   36   35   29   34   32   22   28    27
  15  |    8   23   11   15   13    6   20   16    9   24    5 |    25   32   23   31   34   27   33   28   22   21    24
  16  |    6   28    7   16   16    3   23   10    9   24    5 |    20   28   24   26   28   18   26   19   19   20    20
  17  |   18   21   12   15   12    4   20   17   10   47    6 |    29   30   30   26   27   21   30   19   25   32    21
  18  |    8   28    7   15   15    7   21   14   13   18    5 |    35   48   39   37   39   35   46   33   35   27    35
  19  |    7   24   15   16   13    7   17   11   11   23    5 |    16   29   24   24   20   20   27   18   18   13    18
  20  |   10   24   11   19   16    5   20   12    7   14    5 |    17   27   26   18   27   18   25   21   19   16    18
  21E |    6   20    8   13   18    5   17    8   11   14    4 |    26   34   28   26   31   27   36   25   26   25    26
  22  |    7   25   12   15   18    3   16   12    9   18    4 |    20   30   27   24   28   20   30   22   20   21    21
  23  |    8   19   11   22   17    4   13    8   11   25    5 |    20   31   27   29   32   22   30   22   21   19    22
 X24  |    5  ---  ---  ---  ---   22  ---  ---  ---  ---    0 |    22  ---  ---  ---  ---   12  ---  ---  ---  ---    22
  25  |    8   17    7   15   13    4   16   10   12   16    4 |    21   35   30   23   39   25   38   26   26   24    25
  26  |   15   14    8   12   15    5   13   11   13   22    4 |    18   20   19   22   25   16   22   13   18   16    15
  27E |   11   23   10   14   24    5   20   13   13   27    5 |    50   58   47   49   61   47   60   46   47   60    50
  28  |   12   27    8   14   15    5   21   17   11   25    5 |    21   31   29   30   33   21   28   29   28   29    23
  29  |   14   21    6   18   18    7   21   10    9   32    5 |    21   31   23   26   26   20   34   20   22   30    21
  30  |    7   17   10   12   16    5   13    6    9   10    3 |    12   21   13   13   21   11   19   11   16   10    12
  31E |    8   25    7   17   15    4   17    8   13   14    4 |    11   23   13   13   19    9   20   12   16   13    11
  32  |    9   19    7   17   13    5   19   10   10   11    4 |    11   15   23   18   23   15   20   18   13   16    15
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   12   22    9   16   16    6   18   12   12   22      |T   28   35   31   30   35   27   35   28   29   28    28
 WRMS |   10   22    9   15   15    5   17   11   11   20      |NE  20   29   25   24   29   20   28   21   21   21    21
 MEDI |    8   22    9   15   15    5   18   11   11   21      |MD  21   30   27   26   28   21   30   22   22   23    21



Table 4: Precise Navigation Summary.

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

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

Table 4.1681   GPS week: 1681   MJD: 56011.0-56017.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3057 |U    5     4    11 |U    7     9    24 |U   43    53   100 |
emr | emr 2960 |     8     6    24 |U    8     8    30 |    36    52   103 |
esa | esa 2976 |     5     5    14 |U    7     8    24 |    30    38   197 |
gfz | gfz 2946 |U    6     6    15 |U    7     9    27 |U   37    44   108 |
grg | grg 2975 |     7     7    18 |U    7     9    30 |    52    54   123 |
igr | igr 2969 |     5     4    12 |     7     9    24 |    39    44   105 |
igs | igs 2919 |     5     5    14 |     7     9    26 |    36    46   108 |
jpl | jpl 2958 |     7     6    19 |U    7     9    26 |    35    51    92 |
mit | mit 2976 |     5     5    15 |U    7     9    26 |    52    57   120 |



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 5.1681.0   GPS week: 1681   Day: 0   MJD: 56011.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3053 |     3     4     8 |     7     9    28 |    95    90   304 |
emr | emr 2960 |     6     7    24 |     8     8    35 |   111    75   421 |
esa | esa 2976 |     4     4    12 |     7     7    27 |    23    86   351 |
gfz | gfz 2960 |     5     3    14 |     7     9    30 |   108    74   391 |
grg | grg 2976 |     6     5    16 |     6    10    34 |   104    82   396 |
igr | igr 2974 |     4     4    10 |     6     7    29 |   103    76   391 |
igs | igs 2924 |     4     5    11 |     6     7    28 |   106    76   387 |
jpl | jpl 2958 |     6     7    17 |     7     8    31 |   102    73   359 |
mit | mit 2976 |     4     5    12 |     6     6    32 |   113    79   411 |

Table 5.1681.1   GPS week: 1681   Day: 1   MJD: 56012.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3070 |     4     3     9 |     5     8    18 |    28    30    86 |
emr | emr 2960 |     6     6    20 |     6     9    24 |    26    37    69 |
esa | esa 2976 |     5     5    10 |     5     8    19 |    31    16   697 |
gfz | gfz 2865 |     7     7    15 |     6    10    26 |    35    33    71 |
grg | grg 2976 |     7     4    15 |     6     8    27 |    24    34    94 |
igr | igr 2975 |     5     4    10 |     5     9    18 |    30    30    63 |
igs | igs 2917 |     4     5    10 |     5     8    19 |    27    34    72 |
jpl | jpl 2951 |     5     5    16 |     6    10    23 |    35    34    57 |
mit | mit 2976 |     4     6    13 |     6     7    20 |    22    35    66 |

Table 5.1681.2   GPS week: 1681   Day: 2   MJD: 56013.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3051 |     4     3     9 |    10    11    32 |    99    96   151 |
emr | emr 2960 |     9     6    28 |    10     9    37 |    24    67    63 |
esa | esa 2976 |     6     5    15 |    10    10    33 |    96    88   217 |
gfz | gfz 2960 |     7     6    19 |    10    10    32 |    39    66   150 |
grg | grg 2975 |     7     6    17 |    11    10    37 |   133   114   192 |
igr | igr 2974 |     6     4    13 |    10    12    31 |    63    67   145 |
igs | igs 2837 |     6     4    15 |    12    12    33 |    41    60   144 |
jpl | jpl 2960 |     9     7    21 |    10    10    33 |    27    80    65 |
mit | mit 2976 |     7     4    16 |    10    11    32 |   130   110   172 |

Table 5.1681.3   GPS week: 1681   Day: 3   MJD: 56014.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3055 |     6     4    10 |     8    12    19 |    41    90    71 |
emr | emr 2960 |    10     9    26 |     7     9    25 |    50    97    79 |
esa | esa 2976 |     6     7    16 |     6    11    20 |    20    28    44 |
gfz | gfz 2960 |     7     8    17 |     8    14    22 |    42    88    72 |
grg | grg 2976 |    12    12    30 |     8    13    25 |    52    87    94 |
igr | igr 2976 |     5     5    12 |     7    12    20 |    41    77    67 |
igs | igs 2937 |     6     6    14 |     7    13    19 |    45    92    74 |
jpl | jpl 2960 |     7     7    17 |     7    11    22 |    43    95    79 |
mit | mit 2976 |     6     5    15 |     7    15    20 |    45    82    75 |

Table 5.1681.4   GPS week: 1681   Day: 4   MJD: 56015.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3064 |     4     4    15 |     6     7    23 |    10    25    18 |
emr | emr 2960 |     8     6    27 |     9     8    31 |    14    30    33 |
esa | esa 2976 |     6     6    19 |     6     6    24 |    12    23    25 |
gfz | gfz 2959 |     5     5    17 |     6     7    25 |    10    20    23 |
grg | grg 2976 |     8     8    21 |     7    11    32 |    15    20    24 |
igr | igr 2949 |     5     5    16 |     6     7    25 |    11    23    20 |
igs | igs 2937 |     6     4    20 |     7     7    26 |    10    19    19 |
jpl | jpl 2958 |     9     6    25 |     6     8    22 |    11    29    28 |
mit | mit 2976 |     6     5    21 |     7     9    27 |    12    21    27 |

Table 5.1681.5   GPS week: 1681   Day: 5   MJD: 56016.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3058 |     7     5    15 |     8     9    28 |     9    11    34 |
emr | emr 2960 |     8     5    23 |     9     9    31 |    12    11    21 |
esa | esa 2976 |     5     4    12 |     7     6    22 |    11    10    24 |
gfz | gfz 2959 |     5     7    15 |     6     7    26 |     8     7    18 |
grg | grg 2976 |     6     5    18 |     6     5    29 |     8     9    16 |
igr | igr 2975 |     4     4    11 |     6     8    22 |     8     8    23 |
igs | igs 2929 |     5     5    14 |     7     8    25 |     9     9    22 |
jpl | jpl 2960 |     7     7    19 |     7     9    26 |    11    11    23 |
mit | mit 2976 |     5     5    14 |     6    10    24 |    28    43    48 |

Table 5.1681.6   GPS week: 1681   Day: 6   MJD: 56017.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 3052 |     6     5    10 |     6     6    21 |    21    30    34 |
emr | emr 2964 |     8     6    23 |     8     6    27 |    17    44    39 |
esa | esa 2976 |     5     4    13 |     5     5    24 |    14    15    24 |
gfz | gfz 2959 |     5     6    12 |     6     7    24 |    17    23    31 |
grg | grg 2975 |     6     5    10 |     5     7    29 |    29    30    48 |
igr | igr 2960 |     6     6    14 |     5     7    23 |    15    24    28 |
igs | igs 2954 |     5     5    14 |     6     8    30 |    17    31    36 |
jpl | jpl 2964 |     7     6    19 |     6     6    24 |    14    33    37 |
mit | mit 2976 |     5     4    15 |     5     7    27 |    19    28    39 |


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

Table 6.1681   GPS week: 1681   MJD: 56011.500-56017.500

                                                         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 |       8     -17      92      94     -2 |       5     24
            |      25      28      98      67      6 |       3
emr   uuuuu |      21      31     -89     225     -5 |      64     69
            |      23      17      76     175      4 |       4
esa   uuuuu |       7     -28    -111     -79      3 |      12     29
            |      13      21      59      49      4 |       2
gfz   uuuuu |     -51      27     128      -8      0 |       0     24
            |      22      10      72     105      5 |       2
grg   uuuux |      27      25      62     -14      9 |     -24     46
            |      19      19      52      61     16 |       6
igr   xxxxx |     -30       9      24      28      2 |     -10     27
            |      22      24      19      73      7 |       3
irf   xxxxx |       3      -2      23       5     -2 |      -2     20
            |       5       4      29      29      3 |       1
jpl   uuuuu |      21      -5     125      51      2 |      47     53
            |      31      33      78      65      7 |       2
mit   uuuuu |      -4      -9     -45      23      5 |      11     27
            |      15      14     108      54      3 |       3
ngs   uuuuu |     -36      -1     155     -11     -4 |       4     20
            |      42      48      59      79      3 |       1
sio   uuuuu |      70      14    -255     -27     -8 |      66     71
            |      26      23      89      72      5 |       5


Table 7.1681.0   GPS week: 1681   Day: 0   MJD: 56011.500

                                                         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     -21     104      49     -9 |       9     29
emr   uuuuu |      -9      14    -214     106     -6 |      70     76
esa   uuuuu |      12     -28    -168     -98      9 |      11     33
gfz   uuuuu |     -24      23     165     -36     -5 |       2     29
grg   uuuux |      32       7      -2     -74     18 |     -17     49
igr   xxxxx |     -44     -20      24     -79     -5 |      -6     30
irf   xxxxx |      -2      -8      45     -15      3 |      -2     23
jpl   uuuuu |       5     -57      76      64     -8 |      50     57
mit   uuuuu |     -25     -32     102      55      0 |      10     30
ngs   uuuuu |      -7      89     112      46      2 |       5     23
sio   uuuuu |      25     -30    -156      39    -16 |      75     81

Table 7.1681.1   GPS week: 1681   Day: 1   MJD: 56012.500

                                                         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     -37     158     117     -9 |       7     29
emr   uuuuu |       5       4    -119     144    -12 |      67     74
esa   uuuuu |      23      -7    -187    -134      4 |      11     33
gfz   uuuuu |     -55      24     100      38     -2 |       1     29
grg   uuuux |      49      16      97      74     14 |     -18     49
igr   xxxxx |     -14     -20      -2     -37     -6 |      -8     31
irf   xxxxx |       4      -2      44      24      1 |      -2     23
jpl   uuuuu |      29     -13     134      29     -3 |      47     55
mit   uuuuu |     -18      -3      59      55      4 |       9     30
ngs   uuuuu |     -45     -14     110       5      0 |       4     23
sio   uuuuu |      53      12    -145     -52    -14 |      71     77

Table 7.1681.2   GPS week: 1681   Day: 2   MJD: 56013.500

                                                         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 |       8      -8     189     189     -4 |       5     29
emr   uuuuu |      20      44     -57     130     -2 |      64     71
esa   uuuuu |      21     -17     -82     -18      3 |      10     32
gfz   uuuuu |     -23      27      80      82      3 |      -1     29
grg   uuuux |      33      47      -9     -36     11 |     -20     49
igr   xxxxx |     -13       2      60     -13      1 |     -11     31
irf   xxxxx |      10      -2      41      36     -6 |      -2     23
jpl   uuuuu |      31     -16      47      -8      2 |      45     53
mit   uuuuu |       0      -5      22      38      7 |       8     29
ngs   uuuuu |     -98     -29     139    -147     -8 |       4     23
sio   uuuuu |      73      11    -211      54     -8 |      67     74

Table 7.1681.3   GPS week: 1681   Day: 3   MJD: 56014.500

                                                         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 |      29     -22     -83     124      0 |       2     25
emr   uuuuu |      14      28     -37      62     -5 |      60     66
esa   uuuuu |       4     -12      -9     -79      0 |       8     30
gfz   uuuuu |     -49      16      83      70     -1 |      -3     26
grg   uuuux |      34       2     119      17     16 |     -26     45
igr   xxxxx |      -5      25      24      78      7 |     -13     30
irf   xxxxx |       6       4       4      45     -4 |      -3     23
jpl   uuuuu |      21      33     119     -23      0 |      45     52
mit   uuuuu |       5      16     -99      83     10 |       7     28
ngs   uuuuu |     -48     -68      92     -75     -5 |       2     22
sio   uuuuu |      88      48    -372      38     -6 |      63     68

Table 7.1681.4   GPS week: 1681   Day: 4   MJD: 56015.500

                                                         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 |      40      41     184       8      0 |       4     24
emr   uuuuu |      15      49     -23     182     -1 |      62     67
esa   uuuuu |       0     -71    -104     -97      2 |      12     28
gfz   uuuuu |     -59      43      69      85     -3 |       0     23
grg   uuuux |      34      50      98     -34    -13 |     -26     44
igr   xxxxx |     -21      47      18      86      0 |     -10     26
irf   xxxxx |       3      -1      18     -10     -2 |      -1     20
jpl   uuuuu |      46      28     126     138     10 |      45     53
mit   uuuuu |       9     -10    -131     -16      7 |      11     27
ngs   uuuuu |     -56       0     207     -18     -3 |       4     20
sio   uuuuu |      87      16    -253    -115     -4 |      64     69

Table 7.1681.5   GPS week: 1681   Day: 5   MJD: 56016.500

                                                         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     -28      55     143      6 |       7     23
emr   uuuuu |      58      40    -158     482     -3 |      64     68
esa   uuuuu |      -6     -28     -91    -118      7 |      16     27
gfz   uuuuu |     -84      38     123    -117      0 |       2     22
grg   uuuux |      -8      21      92     -89    -11 |     -27     46
igr   xxxxx |     -57      17      16     118      6 |      -8     24
irf   xxxxx |       0      -2      42      -8     -4 |       1     18
jpl   uuuuu |      55     -30      84     134      6 |      49     55
mit   uuuuu |      14     -14     -74      26      4 |      16     26
ngs   uuuuu |     -34      17     256      90     -6 |       6     19
sio   uuuuu |     101      19    -325     -36     -6 |      66     70

Table 7.1681.6   GPS week: 1681   Day: 6   MJD: 56017.500

                                                         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     -43      39      26      2 |       3     12
emr   uuuuu |      44      38     -14     468     -8 |      60     61
esa   uuuuu |      -9     -36    -134      -5     -4 |      12     19
gfz   uuuuu |     -66      21     275    -177      9 |      -2     12
grg   uuuux |      12      34      41      46     31 |     -34     44
igr   xxxxx |     -55      10      29      45     12 |     -12     17
irf   xxxxx |      -3      -4     -31     -33     -5 |      -2     11
jpl   uuuuu |     -40      22     288      21     10 |      45     47
mit   uuuuu |     -13     -15    -194     -78      3 |      13     19
ngs   uuuuu |      37      -3     168      26     -6 |       3     10
sio   uuuuu |      63      19    -325    -115     -4 |      60     61



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