[IGSREPORT-20926] Wk 1691 IGS Final Orbits

IGS ACC igs.acc at noaa.gov
Thu Jun 21 10:56:44 PDT 2012


Author:  AC Coordinator / NOAA NGS

sum-file Version 2.0
Final IGS Orbit Combination - Week 1691   (Jun 03, 2012 - Jun 09, 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:

igs1691[0-6].sp3  IGS GPS ephemeris files in SP3 format.
igs1691[0-6].clk  IGS GPS satellite and station clocks in clock RINEX format.
igs1691[0-6].cls  IGS GPS clock combination summary report.
igs16917.erp      Earth Rotation Parameters (ERP) and their rates as well as
                  Universal Time (UT1-UTC) and Length Of Day (LOD) associated 
                  with IGS ephemerides.
igs16917.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   | 12 12
                0  |  EMR   | 30 YELL HERS YELL
                0  |  ESA   | SCH2
                0  |  GFZ   | BRFT DAEJ GMSD KERG PDEL RIO2 SALU
                0  |  GRG   | NYAL
                0  |  JPL   | 30
                0  |  MIT   | 23 23 30 31
                1  |  COD   | WILL
                1  |  EMR   | CHUR CHUR
                1  |  GFZ   | BRFT DAEJ GMSD NICO OHI2 RIO2 SCH2
                1  |  GRG   | NOVM
                1  |  JPL   | 30 CHUR
                1  |  MIT   | 30 10 30 BOR1
                2  |  EMR   | 30 CHUR CHUR HERS MCM4
                2  |  ESA   | IRKJ REUN UNSA
                2  |  GFZ   | 30 BRFT PDEL RIO2 SEY1 TLSE
                2  |  GRG   | IRKJ
                2  |  JPL   | 27 30 CHUR IRKJ
                2  |  MIT   | 30 PTBB SFER NTUS PTBB SFER
                3  |  EMR   | 30 HERS
                3  |  ESA   | NNOR
                3  |  GFZ   | 30 AUCK BOGT BRFT DGAR GMSD HOLB OHI2 PDEL RIO2 SSIA
                3  |  GRG   | USNO TIXI USNO
                3  |  JPL   | 22 30
                3  |  MIT   | 30 31 GMAS SOFI
                4  |  COD   | XMIS
                4  |  EMR   | 30 30 HERS HERS
                4  |  ESA   | NNOR UNSA
                4  |  GFZ   | AUCK BRFT DGAR MAW1 MIZU NYAL OHI2 PDEL RIO2 SCH2
                4  |  GFZ   | STHL TSKB TWTF
                4  |  JPL   | 30
                4  |  MIT   | 30 30
                5  |  COD   | 30 30 TLSE
                5  |  EMR   | 30 MCM4 ONSA
                5  |  ESA   | 30 MDVJ AREQ IRKJ NNOR
                5  |  GFZ   | BRFT OHI2 ONSA PETS RIO2 THTI YAKT
                5  |  GRG   | ADIS IRKJ
                5  |  MIT   | DAV1 DAV1 GODE MDVJ
                6  |  COD   | POTS
                6  |  EMR   | 30 21 30 HERS
                6  |  ESA   | IRKJ NNOR
                6  |  GFZ   | 30 BRFT OHI2 PDEL THTI
                6  |  GRG   | ADIS IRKJ
                6  |  JPL   | 30
                6  |  MIT   | 23 30 23 30 GODE

    
 5. New clock offsets and drifts were estimated for centres showing reference
    clock resets.  Note that only the largest clock offset and drift are output
    to the summary file.  However, the clock combination and the listed RMS
    include all the clock segments.  In summary, the following clock
    shifts/resets were noticed and accounted for:
    
               Day | Centre |  Time  |  Jump
               ----+--------+--------+-------------
                5  |  GFZ   | ~09:00 | ~ -0.09 ns

 6. Velocity changes were estimated to alleviate the effects of modeling
    problems, experienced by all centres,in the Long Arc (LA) process.
    
             Velocity changes per day and affected satellites:
    
               Day |  0 |  1 |  2 |  3 |  4 |  5 |  6 |
           --------+----+----+----+----+----+----+----+
           PRN G30 |    |  4 |    |    |    |    |    |

 7. 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.
    

 8. 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  |     .6    -.1   -1.3     -46    -32     28     .01
       EMR  |     .7   -7.1   10.2      -6     -5    -11     .34
       ESA  |    1.8   -3.6   10.2     -46    -53    102    -.04
       GFZ  |    -.8     .5    -.1     -17     17     -8    -.05
       GRG  |    1.4   -1.1   19.6     -24     15    -13    -.14
       JPL  |    3.6   -4.8    7.2     -23    -23      4     .26
       MIT  |    3.0   -2.7   15.7     -36     29    -67     .06
       NGS  |    4.5     .4   20.3     -70     15     16     .13
       SIO  |   -1.2   -7.7   -2.2    -119    -24     92     .16


 9. 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.

10. 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.

11. 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 1.1691.a). It also displays the computed satellite
position sigmas for the combined orbits (table 1.1691.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 2.1691.[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 3.1691.[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 5.1691.0-6).

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 1691 summary.                       (Jun 03, 2012 - Jun 09, 2012)

Table 1.1691.a   GPS week: 1691   MJD: 56081.000-56087.000

         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  263|    0     0    -3    10    45    12  -.25    9    8 |    -726     498     15     61
        |    0     0     1    15    13     9   .02           |     735    1290
emr   92|    0    -1    -1   -72    37   -16   .36   17   17 |    4709      91     18    100
        |    0     0     1    25    15    13   .05           |     968     571
esa  175|    1     0     1   -24    51    22   .24    7    7 |     218   -1862     13    122
        |    0     0     1    18    13    19   .02           |     341     753
gfz  196|   -1    -1     0   -27   -51   -17  -.23   11   11 |      87     252     33    112
        |    0     0     1    60    29    12   .02           |     444     440
grg  125|    1     1     9   -49   -18     8   .61   15   14 |     -21     -97     54    220
        |    1     0     4    15    14     9   .03           |     336     551
igr  n/a|    0     0    -1   -45   -27   -33  -.07    5    5 |    8960     964     18     66
        |    0     0     0    20    18    19   .04           |    2759     413
jpl  176|    0     0    -6   -18    44    35   .52   14   13 |    3803      61     18     92
        |    0     1     2    33    14    23   .03           |     800     459
mit  253|    0     0     0    -2   -76   -61  -.47   11   10 |    -245     261     20    165
        |    1     0     1    37    16    27   .03           |     408     660
ngs  225|    0     0     3    63   -52   -16  -.21   10    9 | -143417  157944   2059   3767
        |    1     1     1    27    19    16   .06           |  377717  416844
sio  239|   -1     0    -3   190    54    74  -.11   20   19 |     ---     ---    ---    ---
        |    2     0     0    36    10    26   .03           |     ---     ---


Table 1.1691.b   GPS week : 1691   MJD: 56081.000-56087.000   

         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    4    5    4    5    5    5 |
   2  |    4    4    4    4    4    4    4 |
   3  |    4    4    4    4    4    4    4 |
   4  |    4    4    4    4    4    4    4 |
   5  |    5    4    5    4    4    5    5 |
   6  |    3    4    4    4    3    4    4 |
   7  |    4    4    4    5    4    4    4 |
   8  |    3    3    4    4    4    4    4 |
   9  |    4    3    3    4    4    4    4 |
  10  |    4    4    3    4    3    3    4 |
  11  |    5    5    5    5    4    5    5 |
  12  |    5    4    5    5    5    5    5 |
  13  |    5    4    4    4    4    4    4 |
  14  |    4    4    4    4    4    4    4 |
  15  |    5    4    6    4    4    5    5 |
  16  |    4    6    5    5    5    5    6 |
  17  |    5    5    5    4    4    5    5 |
  18  |    4    4    5    4    4    5    5 |
  19  |    4    4    5    5    5    4    4 |
  20  |    4    4    4    4    4    4    4 |
  21  |    4    4    4    4    4    4    4 |
  22  |    4    4    4    4    4    5    4 |
  23  |    4    4    4    5    4    5    5 |
  25  |    5    5    5    5    5    5    5 |
  26  |    4    4    5    5    4    5    4 |
  27  |    3    3    3    3    4    4    4 |
  28  |    4    4    4    4    4    4    4 |
  29  |    4    4    5    5    5    5    5 |
  30  |    5    8    5    4    4    4    5 |
  31  |    4    4    4    4    4    4    4 |
  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 2.1691.0   GPS week: 1691   Day: 0   MJD: 56081.000                            

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  263|    1     0    -3    25    42     6  -.26    9    8 |     -25    -159     16     59
        |                     14    -3                       |
emr   92|    1    -2    -2   -86    10    -2   .27   17   17 |    3935     150     17     95
        |                     -9   -18                       |
esa  175|    0     0     3    -7    52    10   .23    7    7 |    -343    -444     14    120
        |                      6     1                       |
gfz  196|    0     0     0   -61   -36   -21  -.26   10   10 |     -48     468     34    112
        |                     -6    76                       |
grg  125|    1     0     6   -35   -37    -3   .58   14   13 |    -107      64     57    200
        |                    -14    11                       |
igr  n/a|    1     0     0   -15   -33   -19  -.14    5    4 |    5436    1190     18     71
        |                    -11    37                       |
jpl  176|    0     0    -2    -4    28    40   .50   13   13 |    3042     426     17     95
        |                    -31    -1                       |
mit  253|    0     0     0   -10   -68   -31  -.52   13   12 |    -129     106     23    169
        |                      5    33                       |
ngs  225|    0     2     4    81   -84   -37  -.23   12   10 |    -165     -39   1872   3238
        |                    -77   -63                       |
sio  239|   -4     0    -4   185    67   104  -.09   20   18 |     ---     ---    ---    ---
        |                   -155   -71                       |

Table 2.1691.1   GPS week: 1691   Day: 1   MJD: 56082.000                            

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  263|    0     0    -2     7    54     9  -.24    8    8 |    -365    -934     16     58
        |                     30   -19                       |
emr   92|    1    -1     0   -97    20     5   .37   17   17 |    3933    -219     18    105
        |                     -8   -34                       |
esa  175|    1    -1     1   -37    58    21   .23    7    7 |     685   -2680     16    121
        |                      4   -13                       |
gfz  196|   -2    -1     0   -22   -21   -22  -.23    9    9 |     571    -253     35     99
        |                     42    45                       |
grg  125|    1     2     5   -54   -16    16   .67   15   14 |     330    -691     62    289
        |                      9     1                       |
igr  n/a|    0     1     0   -64   -21   -22  -.07    4    4 |    6558     650     20     65
        |                     -9    17                       |
jpl  176|    0     1    -6   -75    49    -7   .52   15   14 |    3460    -523     21     90
        |                     68    22                       |
mit  253|   -1     0     1    48   -95   -25  -.46   11    9 |      52    -296     22    145
        |                    -28    36                       |
ngs  225|    1     0     3    40   -57   -26  -.16   10    8 |    -418    -743   2108   4019
        |                    -16    -5                       |
sio  239|   -1     1    -4   241    57   105  -.09   19   18 |     ---     ---    ---    ---
        |                   -177   -58                       |

Table 2.1691.2   GPS week: 1691   Day: 2   MJD: 56083.000                            

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  263|    0     0    -3     9    61    21  -.25    9    8 |    -678     588     15     53
        |                     44   -11                       |
emr   92|    0    -2    -4   -75    50   -16   .38   18   18 |    4022    -385     19    102
        |                    -28   -64                       |
esa  175|    1     0     0   -18    75    26   .21    8    7 |     -34   -2374     13    130
        |                     -1     0                       |
gfz  196|   -2     0    -2   -51   -86     2  -.23   12   11 |    -446     643     34    118
        |                     28    43                       |
grg  125|    0     0     6   -64    -7    13   .61   16   14 |    -257      -9     58    244
        |                     18   -34                       |
igr  n/a|    0     0    -2   -48     5   -30  -.05    5    5 |    7212     869     20     66
        |                    -20    11                       |
jpl  176|    0     0    -5   -24    52    45   .55   14   13 |    2953    -121     19     94
        |                    -13   -55                       |
mit  253|    0    -1     2     9   -98   -72  -.47   11    8 |    -329     282     19    175
        |                      3    35                       |
ngs  225|    0     0     6    65   -41   -21  -.17   10    9 |    -796     709   1995   4266
        |                    -16    -8                       |
sio  239|    0     0    -3   206    37    61  -.11   20   20 |     ---     ---    ---    ---
        |                   -155   -45                       |

Table 2.1691.3   GPS week: 1691   Day: 3   MJD: 56084.000                            

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  263|    0     0    -5    23    58    22  -.21   10    9 |      82   -1066     14     57
        |                    -24   -10                       |
emr   92|    0     0     0   -47    40   -27   .38   17   17 |    4528    -787     20    103
        |                    -50   -58                       |
esa  175|    0    -2     2   -10    41    12   .26    8    8 |     196   -1680     13    117
        |                     -1    15                       |
gfz  196|   -2     0    -1   -75   -37   -15  -.22   11   11 |     700    -429     35    119
        |                      2    60                       |
grg  125|    0     0     6   -30    -8    16   .63   16   14 |     573   -1016     57    241
        |                    -20   -20                       |
igr  n/a|    0     0    -2   -42   -38   -19  -.01    5    5 |    9058     259     19     62
        |                    -22    46                       |
jpl  176|    0     1    -6    24    58    63   .50   14   13 |    3799    -532     17     95
        |                    -44   -85                       |
mit  253|    0     0     2   -49   -69   -84  -.44   10    9 |     356    -749     18    147
        |                     12    18                       |
ngs  225|   -1     0     4    77   -48    12  -.19    9    8 |      68   -1052   2322   3909
        |                      8    54                       |
sio  239|    1     1    -2   143    60    40  -.08   20   21 |     ---     ---    ---    ---
        |                   -157   -48                       |

Table 2.1691.4   GPS week: 1691   Day: 4   MJD: 56085.000                            

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  263|    0     0    -2   -15    35    23  -.23    9    8 |   -2010    2375     15     58
        |                     76    17                       |
emr   92|    0     0    -2   -87    47   -19   .43   16   16 |    4461     620     18     93
        |                    -30   -47                       |
esa  175|    1    -1     3   -29    44    60   .27    7    7 |     450   -2448     12    117
        |                     -5    27                       |
gfz  196|   -2     0     0    52   -17    -7  -.23   11   11 |     -18     502     32    121
        |                    -12    55                       |
grg  125|    0     1    11   -73     0    12   .57   16   15 |    -284     250     54    178
        |                      8   -11                       |
igr  n/a|    0     0    -1   -77   -28   -29  -.03    4    4 |    9794    1336     18     67
        |                    -10    23                       |
jpl  176|    1     1    -7   -40    37    27   .56   14   14 |    3641     390     20     88
        |                    -48   -31                       |
mit  253|    0     0     0    18   -70   -91  -.44    9    9 |    -850    1223     19    176
        |                     -2     4                       |
ngs  225|    0     0     0    34   -71   -26  -.18    9    8 |   -1811    2021   1899   3518
        |                    -25     9                       |
sio  239|   -1     0    -3   210    60    46  -.11   19   18 |     ---     ---    ---    ---
        |                   -155   -58                       |

Table 2.1691.5   GPS week: 1691   Day: 5   MJD: 56086.000                            

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  263|    0     0    -3    27    38     7  -.28   10   10 |   -1289    1107     17     86
        |                    -20    -9                       |
emr   92|    1     0    -1   -27    41   -22   .35   17   17 |    5652     641     21    116
        |                    -49   -47                       |
esa  175|    0     0     1   -11    34    26   .22    7    7 |     430   -1559     12    121
        |                      6    35                       |
gfz  196|   -2    -2     1   -92   -83   -18  -.26   12   12 |    -400     673     33    109
        |                     -9    76                       |
grg  125|    1     1    14   -43   -22     7   .60   15   13 |    -249     520     42    185
        |                    -11   -22                       |
igr  n/a|   -1     0    -1   -28   -22   -38  -.09    5    5 |   11632    1001     18     68
        |                    -44    35                       |
jpl  176|    0     0    -9    11    58    21   .53   13   13 |    4599     194     18     98
        |                    -53   -21                       |
mit  253|    1     0     0   -51   -82   -85  -.48   11   10 |    -643     802     23    176
        |                     -4    -7                       |
ngs  225|    0    -1     1   108   -26    -6  -.31   11   10 | -999999 1103254   2177   3522
        |                    -85     6                       |
sio  239|   -2     0    -2   142    43    70  -.15   20   19 |     ---     ---    ---    ---
        |                   -150   -51                       |

Table 2.1691.6   GPS week: 1691   Day: 6   MJD: 56087.000                            

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  263|    0    -1    -1    -1    24    -2  -.26    8    8 |    -802    1579     13     59
        |                     45    13                       |
emr   92|    2     0    -2   -86    50   -30   .37   17   17 |    6432     619     15     90
        |                    -40   -58                       |
esa  175|    1     0     0   -59    54     0   .23    8    7 |     143   -1851     11    130
        |                     20    24                       |
gfz  196|    0     0     0    57   -76   -36  -.19   11   11 |     250     164     29    108
        |                    -26   105                       |
grg  125|    2     1    16   -46   -39    -6   .62   15   15 |    -158     203     52    204
        |                     -5   -10                       |
igr  n/a|    0     0    -1   -39   -54   -73  -.07    5    5 |   13036    1446     17     65
        |                    -22    45                       |
jpl  176|    0     1    -9   -19    23    54   .49   14   14 |    5131     593     16     88
        |                    -50   -12                       |
mit  253|    0     0     0    18   -52   -42  -.48   13   11 |    -173     464     21    168
        |                    -25   -21                       |
ngs  225|    0     0     1    36   -40   -10  -.27   10   10 |    -803    1458   2045   3902
        |                     16    34                       |
sio  239|   -5     0    -2   205    56    93  -.14   21   21 |     ---     ---    ---    ---
        |                   -160   -49                       |

       
       
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 3.1691.0   GPS week: 1691   Day: 0   MJD: 56081.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |   12   13    6   13   12    5   19   10   11   34    5 |    39   51   47   48   57   47   58   46   50   31    46
   2  |    8   11    8   10   10    3   12   10   12   31    4 |    33   36   33   34   35   34   35   37   37   24    33
   3  |    8   10    6    8   11    4   10   16   14   17    3 |    26   21   24   24   24   24   24   26   22   21    24
   4  |    9   10    9    7   14    4    8   15   12   18    3 |    29   31   35   33   36   32   27   37   36   30    31
   5  |    8   21    8    9   18    4   18   13   10   18    4 |    36   42   32   36   36   34   40   34   35   31    34
   6  |    5    8    5    7   10    4    9   16   11   15    3 |    32   26   29   32   29   30   28   32   30   25    30
   7  |    7   16   10   10   15    4   12   13    9   20    4 |    27   33   32   28   34   26   31   24   25   25    26
   8  |    5   12    7    9   14    4    9   10    9   10    3 |    23   30   28   24   29   24   29   26   30   22    25
   9  |    8   14    7    7    9    4    8    8   13   16    3 |    19   27   22   22   24   20   22   20   21   23    20
  10  |   10   12    5   11   10    5   10    9   12   14    3 |    19   28   25   26   23   21   27   24   27   23    23
  11  |   10    8    5    9   11    5    9   10   15   41    4 |    40   47   47   44   52   44   46   41   48   60    44
  12E |   13   19   10    8   13    6   19   25   10   16    5 |    23   31   28   26   27   27   28   24   27   26    24
  13  |    8   23    7   10   21    4   11   15   10   13    4 |    21   36   24   26   35   21   28   25   21   23    23
  14  |    7   18    6   10   16    6   11   10   12   14    3 |    35   40   36   36   37   37   35   37   39   37    35
  15  |    9   15    6   11   20    6   19   10   13   17    4 |    38   40   37   41   44   37   40   43   36   34    38
  16E |   10   16    6    7   15    5   14   16    9   14    4 |    30   31   30   27   29   29   32   34   32   32    29
  17  |    9   21   10   12   15    4   14   18   15   26    5 |    26   34   29   29   32   26   30   32   35   29    26
  18  |    6   18    8    9   15    3   14    9   14   19    4 |    34   39   33   35   35   33   41   32   33   33    33
  19  |    8   18    6   11   12    4   14   15   10   22    4 |    24   29   26   22   27   23   29   25   28   27    24
  20  |    7   20    7   11   17    3   11   15   12   20    4 |    30   32   27   26   30   27   31   28   29   34    26
  21  |    5   12    5    9    8    4   10   11   16   27    3 |    31   35   33   34   35   32   35   32   35   38    32
  22  |    6   16    6    9   15    5   10   12   14   14    3 |    39   41   37   41   41   40   41   42   41   41    38
  23  |    7   22    5    9   18    4   14   11   11   22    4 |    22   34   28   27   32   24   31   25   27   27    25
  25E |   17   23    8   11   15    7   17   16   15   13    5 |    25   38   32   30   30   30   31   28   30   29    27
  26  |    9   15    8   14   11    4   10   11   15   18    4 |    79   80   77   81   79   79   80   78   73   78    79
  27  |    8   10    6    9   11    4    8    7   13   10    3 |    27   34   31   30   32   29   33   30   31   30    30
  28E |    5   16    9   10   13    4    9   17   12   14    4 |    58   63   59   54   61   59   60   65   63   55    57
  29  |   10   22    9   11   13    4   17    9    6   20    4 |    30   36   34   36   32   32   34   30   30   29    31
  30E |    7   27    5    9   12    6   16    8   15   19    4 |    26   52   31   27   39   27   43   25   24   36    30
  31  |    6   17    4    9   18    4   12    7   10   21    3 |    38   44   39   37   48   38   41   39   41   41    39
  32  |   11   16    7   11   13    3   20   13   11   14    4 |    28   31   26   27   25   25   31   29   29   29    25
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   17    7   10   14    5   13   13   12   20      |T   31   37   33   33   36   32   36   33   34   33    32
 WRMS |    8   17    7   10   13    4   13   12   10   18      |NE  31   36   33   33   36   32   35   33   34   32    32
 MEDI |    8   16    7    9   13    4   12   11   12   18      |MD  30   35   32   30   34   30   32   32   31   30    30

Table 3.1691.1   GPS week: 1691   Day: 1   MJD: 56082.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |    8   17    6    8   12    4   19   10   10   28    4 |    28   38   26   28   39   28   44   33   27   24    29
   2  |    8   10    7   11   10    4   13    9    9   30    4 |    21   23   22   20   20   22   20   25   25   18    20
   3  |    6   14    8    9   12    5   13   16   13   20    4 |    24   26   23   26   26   25   24   32   25   31    24
   4  |    7   11    9    7   12    5    7   10   12   15    3 |    21   24   23   21   19   22   21   29   25   24    21
   5  |    9   22    7    9   18    3   18    9    9   16    4 |    30   35   29   33   32   30   34   33   33   33    29
   6  |    6   12    7   11   10    6   12   18   10   18    4 |    32   32   31   37   32   31   32   38   33   35    32
   7  |   11   20    7    9   16    4   11   10   10   19    4 |    26   37   27   25   34   26   30   26   22   25    24
   8  |    7   15    7    8   13    3   11    7    8    9    3 |    31   36   34   31   32   32   32   35   32   32    31
   9  |    6   13    5    7   10    4   13    7    9   18    3 |    18   23   20   21   21   18   22   19   21   22    19
  10  |    8   12    7   10   12    4   12    6   13   13    3 |    21   27   25   23   24   22   27   24   26   25    22
  11  |   10   13    5    7   10    4    9   11   13   42    4 |    27   35   27   26   36   29   34   34   31   53    30
  12E |   10   18    8    8   13    6   18   12    9   11    4 |    25   33   29   25   29   26   29   27   26   27    25
  13  |    8   19    6    8   22    3   14   11   12   12    4 |    22   33   26   24   37   24   30   25   23   24    23
  14  |    7   17    5   11   17    7   12    7   10   12    3 |    39   43   41   41   42   40   45   42   42   43    40
  15  |   10   17    6   12   21    4   21    7    8   11    4 |    48   49   46   43   54   45   49   44   47   45    45
  16E |   10   19    8    9   20    7   17   29   11   23    5 |    40   42   42   39   45   39   44   49   41   46    40
  17  |    9   21    7   11   15    4   15   14    8   24    4 |    24   32   25   26   34   24   29   27   26   28    23
  18  |    6   22    7    8   15    4   17    7    7   17    3 |    26   36   30   27   34   26   33   27   25   28    27
  19  |    7   17    6    9   13    4   15   13   10   21    4 |    22   30   21   21   27   22   28   26   24   28    22
  20  |    7   18    7    8   17    5   14   11   10   15    4 |    27   32   26   27   31   26   29   29   28   30    26
  21  |    5   12    8    7   10    4   11    7   11   26    3 |    18   27   24   19   22   19   24   19   21   29    19
  22  |    7   14    6   10   16    4   14   10    6   12    3 |    35   37   36   36   42   34   37   38   34   36    35
  23  |    8   23    6    7   16    3   16    8    8   16    4 |    22   33   26   24   32   23   27   22   24   21    23
  25E |    9   21    8   12   22    6   17   14   10   10    4 |    19   36   30   26   32   24   32   22   23   24    23
  26  |    7   16    8   14   14    6   11   11    8   16    4 |    97   99   97   98   96   97   98  104  103  102    98
  27  |    7   14    6    9   12    3   14    7    8   11    3 |    23   27   25   23   27   21   28   20   24   18    23
  28E |    6   16    6   10   13    3   12   12    6    9    3 |    56   57   56   60   49   57   54   59   58   57    56
  29  |   12   18    9   11   13    4   20    7   10   19    4 |    31   42   36   35   40   33   42   32   36   33    34
 X30E |   14  ---   16   11   32    8   35   25   16   21    7 |    38  ---   34   34   45   34   40   37   31   35    32
  31  |   11   18    6    7   18    5   16    6    8   19    4 |    43   47   45   46   51   45   51   45   45   43    44
  32  |    9   20    6   11   14    4   21   12    9   12    4 |    30   36   29   34   32   29   35   32   32   31    30
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   17    7    9   15    4   15   11   10   19      |T   31   36   32   32   36   31   35   34   32   33    31
 WRMS |    8   17    7    9   14    4   14    9    8   18      |NE  29   35   31   31   34   30   34   33   31   33    30
 MEDI |    8   17    7    9   14    4   14   10   10   16      |MD  27   35   29   27   32   26   32   32   27   30    27

Table 3.1691.2   GPS week: 1691   Day: 2   MJD: 56083.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |   10   15    7   11   11    4   19    9   15   26    4 |    33   42   34   35   45   34   47   39   31   30    35
   2  |    7   11    7   12   12    6   12    9    8   28    4 |    24   25   27   25   24   25   27   29   27   21    24
   3  |    5   12    6   10   11    4   11   14   13   19    4 |    18   21   17   18   21   17   22   24   24   25    19
   4  |    7   10    6    9   16    5    9    8   11   16    3 |    19   22   24   24   25   20   21   28   26   21    22
   5  |    9   19   10   11   18    4   14   10   11   15    4 |    37   43   33   37   34   37   41   39   34   35    34
   6  |    6   14    7   11   10    4   11   16   13   17    4 |    21   27   22   24   26   22   27   30   27   30    23
   7  |    9   17    7   14   20    4    9    9    9   21    4 |    28   36   31   36   37   30   36   31   30   30    30
   8  |    6   13   10    8   16    3   10    8   10   12    3 |    30   35   33   36   31   31   36   33   33   33    32
   9  |    6   12    7   11   12    4   10    5   10   17    3 |    22   25   25   25   24   22   25   23   24   24    22
  10  |    9   10    7   14   14    5    8    7    8   13    3 |    28   30   27   28   24   28   29   29   25   27    25
  11  |    9   10    4    8    9    4    6    9   14   42    4 |    34   37   36   33   41   33   38   39   37   57    36
  12E |    8   18    8   11   19    7   20   11    9   17    4 |    23   31   29   30   28   28   33   26   25   28    26
  13  |    9   24    8   14   19    4   12    8   10   13    4 |    23   36   32   34   38   27   31   28   30   27    27
  14  |   10   17    5   12   17    7   14    8    8   13    3 |    39   45   43   47   50   42   45   42   38   39    42
  15  |   20   22   10   17   16    7   21   13   15   22    6 |   100  100  100  101   97   94   97   99   97   98    98
  16E |    9   22    9   12   14    5   15   20   10   21    5 |    30   38   33   31   39   34   38   39   36   41    33
  17  |    8   20    9   13   18    5   15    7   12   27    4 |    28   33   28   31   29   27   31   32   29   32    28
  18  |    8   22    9    8   20    4   15   10    9   17    4 |    35   42   36   38   43   33   41   32   35   33    35
  19  |    7   19    7   10   14    5   16   18   10   25    4 |    21   29   22   22   28   20   30   23   24   27    22
  20  |    8   20    5    9   15    2   13   12    7   14    3 |    31   36   28   29   36   30   36   36   32   36    31
  21  |    5   11    8    7   11    4   10    9   10   27    3 |    27   32   34   29   32   28   33   27   34   36    29
  22  |    8   16    7   10   17    3    9   10    8   15    3 |    40   46   41   45   50   41   47   41   44   41    42
  23  |   10   24    8   11   16    4   13    5    7   16    4 |    20   32   26   29   31   23   27   21   26   20    23
  25E |   10   26    9   14   25    6   15   12    7    9    5 |    26   42   35   31   41   31   38   29   31   31    30
  26  |   12   21   10   14   22    7   13   16   14   19    5 |   113  115  114  115  104  111  113  116  116  114   113
  27  |    6   11    5   11   14    5   10    5    6   12    3 |    24   26   26   23   29   20   28   21   21   20    23
  28E |    6   14    9   12   15    4    9   14    8   12    3 |    48   51   51   53   50   48   49   51   53   45    50
  29  |   12   22    9   13   14    4   19    6    7   20    4 |    37   46   42   38   43   38   45   37   41   34    38
  30E |    6   23   10   13   17    9   14   12   14   19    4 |    35   59   38   37   50   41   46   37   41   46    39
  31  |    8   19    6   11   17    6   14    4    7   19    3 |    44   50   41   42   52   43   45   40   42   38    42
  32  |   11   19    7   14    9    4   17   11   11   12    4 |    36   35   32   36   34   31   39   37   34   37    34
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   18    8   12   16    5   14   11   10   20      |T   34   40   36   37   39   35   40   37   37   37    35
 WRMS |    8   18    7   11   14    5   13    8    9   20      |NE  33   38   34   35   37   32   38   35   34   35    33
 MEDI |    8   18    7   11   16    4   13    9   10   17      |MD  30   36   33   33   36   31   36   32   32   33    31

Table 3.1691.3   GPS week: 1691   Day: 3   MJD: 56084.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |   12   13    6   10   10    5   18    9   11   26    4 |    39   49   46   44   48   43   54   43   49   34    44
   2  |    7   12    7   10   13    5   14    8    7   27    4 |    30   27   25   23   28   26   27   32   28   23    27
   3  |    7   12    8    8   13    5   10   10    8   16    3 |    31   27   26   28   31   29   31   30   30   28    29
   4  |    9   10    7    7   15    3    9    8    9   17    3 |    30   31   33   30   32   28   27   36   34   32    31
   5  |   11   20    8   10   17    5   16    9    6   15    4 |    39   41   35   37   36   36   40   40   38   39    38
   6  |    6   11    9   12   13    5   10    9   10   14    3 |    40   38   37   42   42   40   43   41   40   39    40
   7  |   11   18   10   11   25    6   12   10   10   21    4 |    30   38   32   34   34   30   35   29   35   33    31
   8  |    8   12   11   10   18    5   11   10    8   15    3 |    35   41   42   39   40   39   40   40   39   39    39
   9  |   11   11    7    8   13    4   10    8   11   25    4 |    28   34   32   30   35   30   33   30   31   32    31
  10  |    7   13    5   12   14    5   12    8    9   13    3 |    28   33   30   28   30   28   33   30   33   29    30
  11  |   10   11    6    9    9    8    9   10   10   41    4 |    34   43   38   38   43   37   41   36   41   55    38
  12E |   14   17    9   10   16    4   20    9   12   13    4 |    28   32   33   32   32   31   34   29   31   32    30
  13  |    7   21    8   12   25    5   13    8    8   13    4 |    27   39   33   31   40   28   36   27   32   29    30
  14  |    6   17    9   11   18    8   13   12    8   15    4 |    39   44   40   40   43   40   40   41   40   42    38
  15E |   12   12    8   13   15    5   18    7    9   13    4 |    63   68   66   64   68   64   67   63   68   70    64
  16E |    9   25   10   11   17    4   16   19    8   14    5 |    43   46   46   43   50   44   51   42   43   43    45
  17  |    7   17    8    8   15    5   19    6    5   24    4 |    32   40   33   37   38   32   38   35   33   36    33
  18  |    9   21    8    9   15    4   17    9    9   19    4 |    21   33   24   23   29   22   34   21   23   22    22
  19  |   10   19    7   11   15    7   16   11    8   24    4 |    26   34   25   25   32   27   32   24   28   27    26
  20  |    9   20    7   10   16    6   13    9    8   14    4 |    28   38   32   35   36   32   36   29   34   32    31
  21  |    6   12    6    7   13    4   10    8   10   27    3 |    23   28   24   25   27   24   27   23   26   32    24
  22  |    7   16    7   11   15    4   13   11   10   18    4 |    30   33   30   33   37   31   35   32   30   33    29
  23  |    8   27    7   14   21    4   14    6    7   15    4 |    30   44   34   38   36   31   37   31   34   31    32
  25E |   12   23   13   12   21    6   12   12   14   12    5 |    24   35   34   23   35   28   36   29   29   25    28
  26  |   11   21    9   15   14    6   11   11   10   18    4 |    62   60   57   57   58   60   59   61   63   63    60
  27  |    9   10    5    9   12    4    9    6   11   17    3 |    27   29   30   29   35   28   32   24   33   24    28
  28E |    8   14   11   11   12    4   11   14    7   18    4 |    46   45   45   49   49   47   45   52   45   52    45
  29  |   13   21    9   11   16    4   19    7    9   21    4 |    33   43   37   35   40   35   42   33   37   37    36
  30E |    9   20    8   12   17    8   15   10   10   18    4 |    43   56   47   46   56   45   56   40   45   43    47
  31  |    8   17    8   10   20    6   11    8    8   21    4 |    50   45   45   43   53   42   50   44   40   45    44
  32  |   13   20    5   11   10    3   20    8    9   12    4 |    34   42   37   43   39   39   47   34   42   35    37
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   17    8   11   16    5   14   10    9   20      |T   34   39   36   36   39   35   39   35   37   36    35
 WRMS |    9   17    8   11   14    5   13    9    8   21      |NE  33   37   34   34   37   33   38   33   35   35    34
 MEDI |    9   17    8   11   15    5   13    9    9   17      |MD  31   39   34   35   37   32   37   33   34   33    32

Table 3.1691.4   GPS week: 1691   Day: 4   MJD: 56085.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |   14   12    7   13   10    5   18    9   12   25    4 |    36   44   40   42   50   39   52   42   33   34    39
   2  |    8    9    7    7   15    3   12    6    7   23    3 |    25   27   26   26   31   24   26   28   28   21    24
   3  |    5   14    5   10   11    4   10    9   13   18    3 |    19   20   19   17   19   19   20   22   22   22    18
   4  |    9    9    4    9   17    4   11   11   10   19    3 |    24   30   28   33   36   26   25   33   27   30    27
   5  |    6   21    8    7   17    4   15    9    7   14    3 |    28   34   27   31   26   27   30   32   32   29    27
   6  |    5   12    6    8   11    4   11    9   12   17    3 |    19   20   18   20   20   18   20   22   21   20    18
   7  |   10   18    6    8   18    3   14    7   10   22    4 |    31   35   31   31   40   30   32   29   31   30    29
   8  |    7   13    6    9   18    3   11   12   12   15    3 |    30   34   35   30   38   32   35   30   33   28    30
   9  |    6   11    6   13   14    4   13    9   10   18    3 |    20   24   19   25   25   18   25   22   20   24    19
  10  |   11   10    5    9   15    4    8    7   10   12    3 |    22   28   27   25   27   24   29   27   26   26    24
  11  |    8    9    6   10    8    4   10    8   11   42    4 |    32   38   35   37   42   33   37   37   27   57    34
  12E |   15   19    8   14   15    5   19   10    7   10    4 |    20   31   26   27   29   25   28   25   25   23    22
  13  |    7   21    8   11   22    5   16    6    7   11    4 |    26   37   31   29   41   28   36   28   29   29    28
  14  |    8   17    6   11   17    6   11   10    8   13    3 |    29   38   34   28   36   29   32   34   34   35    31
  15E |    7   16    9   14   16    4   19    7    8   14    4 |    45   53   48   43   49   47   51   51   54   56    48
  16E |    9   23    8   13   18    5   15   14    8   13    4 |    34   40   36   38   42   34   36   37   32   37    34
  17  |    8   18    6   11   17    5   17    8   11   23    4 |    28   38   27   28   37   27   34   29   29   30    27
  18  |    7   21    9    9   16    5   17    8    9   21    4 |    18   34   26   19   32   22   30   23   25   25    21
  19  |    8   19    6   16   13    3   16   14   10   22    4 |    29   39   33   25   33   30   39   35   31   36    31
  20  |    7   15    6   11   17    4   16    7    8   15    3 |    22   27   24   25   31   22   29   23   22   23    22
  21  |    6    9    6    8   12    4    9    8    8   29    3 |    21   31   30   23   29   26   30   26   30   33    25
  22  |    7   17    6   10   17    5   12   10    5   20    3 |    23   35   28   25   32   27   29   29   27   31    25
  23  |    7   23    6   12   22    7   12    7    9   16    4 |    16   32   23   20   32   21   27   20   20   19    19
  25E |    9   22    8   16   20    6   17   12   10   12    4 |    22   33   29   27   31   25   32   24   27   24    24
  26  |   10   15    6   15   18    4   11   12   11   15    4 |    49   53   50   51   51   49   50   50   52   52    49
  27  |   10   11    6   13   15    5   10    8    9   10    3 |    33   42   35   39   39   38   40   43   39   41    36
  28E |    7   16    8   11   14    3   10    7    8   15    3 |    39   44   41   38   41   40   41   38   42   39    38
  29  |   13   20    8   13   15    4   20    7    9   20    4 |    27   40   33   33   38   31   42   30   33   31    31
  30E |    7   17    8   11   16    6   15   12   11   20    4 |    34   48   36   38   44   36   45   35   31   41    36
  31  |    6   17    7   10   19    4   14    6   10   19    3 |    26   32   27   26   36   25   30   26   25   26    25
  32  |   10   17    7   12   13    3   11    9    9   13    3 |    25   32   26   27   32   24   34   26   29   26    26
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    9   16    7   11   16    4   14    9    9   19      |T   27   35   30   29   35   28   33   30   30   31    28
 WRMS |    8   16    7   11   15    4   14    9    8   18      |NE  26   33   29   28   34   27   32   30   29   30    27
 MEDI |    8   17    6   11   16    4   13    9    9   17      |MD  26   34   29   28   36   27   32   29   29   30    27

Table 3.1691.5   GPS week: 1691   Day: 5   MJD: 56086.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |   14   14    6   15    8    4   17    8   14   29    4 |    28   39   34   39   42   32   44   33   29   30    34
   2  |    8   10    6   12   12    4   12   11    8   23    3 |    22   22   22   23   25   21   20   33   23   29    24
   3  |    6   12    5   11   10    3   10    9   11   22    3 |    20   21   20   17   18   18   23   24   21   22    21
   4  |   12   12    6   11   12    5   11   15    9   20    4 |    25   26   27   35   30   26   22   39   32   37    30
   5  |   11   18    8   11   15    4   15   13   11   17    4 |    23   28   23   30   26   24   25   34   24   35    24
   6  |    8   11    4   14    9    4    9   12   10   19    3 |    24   23   25   24   26   22   27   30   25   28    26
   7  |    8   18    8    8   16    3   11   10    9   23    4 |    22   35   27   23   30   21   30   27   17   29    24
   8  |    8   14    5    9   15    5   12   17    9   16    4 |    23   27   26   28   20   24   28   38   24   35    26
   9  |   10   12    7   12   12    3    8    8   11   20    3 |    23   26   24   26   25   23   27   27   26   27    25
  10  |    9   10    5    9   12    4    9   11   10   14    3 |    22   26   23   25   24   21   26   30   23   27    24
  11  |   10   10    6   13    8    5    8    7    8   43    4 |    29   33   31   30   38   26   32   25   29   51    30
  12E |   16   18    9   14   15    5   19   10   12   13    4 |    25   32   34   32   30   28   32   32   28   35    30
  13  |    7   24    8   12   17    4   11    8    9   10    4 |    23   37   26   23   37   22   31   25   22   23    25
  14  |    8   19    6   11   12    6   10    9   14   14    4 |    26   36   31   27   37   28   33   31   28   30    30
  15E |   10   14   10   15   17    4   17    9   15   11    4 |    28   30   32   29   34   26   32   31   21   31    30
  16E |   10   22    8   15   15    4   15   12    8   16    4 |    18   29   26   22   28   22   26   22   22   24    23
  17  |    7   20    7    8   17    5   16   10   12   25    4 |    29   36   29   28   29   27   33   33   28   35    30
  18  |   10   21   10   11   16    5   17    9   11   22    4 |    22   32   25   21   33   21   34   25   23   26    25
  19  |    8   18    9   13   13    3   14   11    8   21    4 |    22   31   22   19   26   21   31   27   21   23    24
  20  |    9   20    6   11   14    5   13    8   11   15    4 |    21   30   26   21   30   21   29   23   21   25    25
  21  |    7    9    6   10   11    3   10   11    9   28    3 |    17   25   23   21   26   19   25   24   20   30    22
  22  |    8   18    7   10   32    5   15   13   11   22    5 |    23   30   29   21   43   22   32   28   24   28    27
  23E |   11   26    8   15   14    5   11    9   14   21    4 |    38   45   42   39   43   38   42   37   42   37    41
  25E |   11   20    7   13   16    6   13   16   10   13    4 |    19   27   29   29   31   23   31   32   24   30    26
  26  |   11   19    7   13   14    5   12   15   16   15    4 |    32   35   35   41   26   34   29   48   36   38    35
  27  |   16   12    6   13   19    5    7    8   13   14    4 |    63   66   66   59   58   58   65   61   60   61    61
  28E |    9   14    8   10   12    5    9   12    9   13    3 |    34   33   34   37   29   30   31   40   32   38    34
  29  |   15   22    7   13   13    4   20   10   11   20    5 |    24   31   29   28   35   25   31   27   23   26    26
  30E |    9   17    7   11   13    7   15   11   12   19    4 |    26   41   32   26   37   30   40   27   29   35    31
  31  |    6   18    7   10   16    6   13    9   10   20    4 |    31   37   33   28   39   30   37   32   29   32    32
  32  |   12   18    5   12   12    4    9   12   15   13    4 |    23   30   26   24   29   23   30   27   24   26    26
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |   10   17    7   12   15    5   13   11   11   20      |T   25   32   29   28   31   26   31   31   26   31    28
 WRMS |   10   17    7   12   13    5   13   10   10   19      |NE  25   31   28   27   31   25   31   31   26   31    28
 MEDI |    9   18    7   12   14    5   12   10   11   19      |MD  23   31   27   27   30   24   31   30   24   30    26

Table 3.1691.6   GPS week: 1691   Day: 6   MJD: 56087.000                            

        Weighted Average                                            Orbit Dynamics (7 days)
 PRN  |  cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio  IGS |   cod  emr  esa  gfz  grg  igr  jpl  mit  ngs  sio   IGS
------+--------------------------------------------------------+---------------------------------------------------------
   1  |   13   16   10   16   10    4   20    9   11   30    5 |    45   59   52   60   65   51   64   51   48   44    52
   2  |    8   10    7   11   13    3   13   14    8   20    4 |    34   31   30   30   36   30   30   35   32   29    30
   3  |    5   12    7    9   13    4   10   12    8   22    3 |    27   29   29   23   27   26   28   25   28   26    25
   4  |    9   10    6    8   14    4    8   17   10   26    4 |    32   33   33   35   43   32   32   39   36   35    32
   5  |    8   21    9   13   19    5   18   14    8   24    4 |    26   30   22   27   32   24   26   31   28   34    23
   6  |    6   10    7   11   12    4   11   17    8   21    3 |    28   32   31   25   32   28   29   25   28   27    26
   7  |    5   20    7    7   16    5   11    9   10   26    4 |    33   42   36   36   42   34   39   34   31   36    33
   8  |    8   14    4    7   15    5   13   15    8   13    3 |    29   32   32   31   33   32   36   32   30   29    29
   9  |    9   14    9   17   13    5   11   13   10   20    4 |    27   31   29   32   29   27   30   32   25   31    27
  10  |   10   10    5    9   14    3   10   13    9   16    3 |    22   29   28   28   36   25   29   30   31   27    26
  11  |    8   12    6    9   12    5    8    8   13   42    4 |    42   48   46   47   57   43   45   41   37   63    44
  12E |   11   16    8   12   17    5   20   14    9   16    4 |    30   34   34   33   38   32   37   32   30   32    31
  13  |    5   23    7   12   13    5   13   12   12   13    4 |    28   42   33   30   43   29   37   31   30   29    31
  14  |    5   19    5   11   10    5   11   11   11   13    3 |    27   38   34   31   38   30   35   33   28   35    32
  15E |    8   15    9   14   15    4   17   12   12   16    4 |    45   49   49   43   51   45   49   47   49   52    46
  16E |    9   26   10   15   13    6   15   19   10   31    5 |    34   45   42   40   40   38   39   42   38   40    37
  17  |    7   20    9    8   17    4   16    9   12   26    4 |    29   37   30   30   40   30   37   30   30   31    29
  18  |    6   21   10   11   18    6   15   13   12   22    4 |    19   31   25   21   39   21   30   21   23   21    22
  19  |    6   18    5   10   14    4   14   11   10   21    4 |    33   42   35   32   39   33   41   33   34   33    34
  20  |    6   17    6   11   15    6   13   10   11   17    4 |    23   28   25   24   35   24   29   22   23   23    23
  21  |    6   13    9    8   14    4   11   10   11   29    4 |    28   37   30   30   39   29   32   28   30   36    29
  22  |    6   17    8    8   20    4   14   12    7   19    4 |    24   34   30   27   44   26   32   25   24   25    26
  23E |    6   23    8   15   14    6   13   13   10   18    4 |    18   32   27   23   34   22   26   26   18   25    20
  25E |   10   21    9   10   15    5   15   17    9   13    4 |    28   35   36   31   38   31   38   32   30   30    30
  26  |   10   20    7   11   16    5   13   14    7   14    4 |    36   35   35   37   35   34   33   40   36   37    34
  27  |    9   14    9   14   12    5   11   12   10   12    4 |    45   50   48   47   44   45   49   53   46   49    46
  28E |    6   16   10   10   13    5    9   12    7   15    3 |    43   45   47   46   43   45   45   45   42   42    43
  29  |   11   22    7   11   15    4   22   11   10   21    4 |    36   45   40   38   47   38   48   38   37   40    38
  30E |    7   16    6   10   13    5   16   14   15   23    4 |    36   46   39   38   46   37   48   35   36   36    38
  31  |    6   20    7   11   15    5   14    8   15   18    4 |    36   43   40   40   45   38   39   35   39   33    37
  32  |    8   17    7   13   14    5    9   15   11   15    4 |    26   34   28   28   38   27   32   27   28   29    27
------+--------------------------------------------------------+---------------------------------------------------------
 RMS  |    8   17    8   11   15    5   14   13   10   21      |T   31   38   34   33   40   32   36   33   32   34    32
 WRMS |    8   17    7   11   15    5   14   11   10   21      |NE  30   37   33   32   39   31   35   32   31   33    31
 MEDI |    8   17    7   11   14    5   13   12   10   20      |MD  29   35   33   31   39   31   36   32   30   33    31



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 4.1691   GPS week: 1691   MJD: 56081.0-56087.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2975 |U    6     6    16 |U    6     7    21 |U    8    14    19 |
emr | emr 2958 |    10     9    23 |U   10     8    27 |    20    23    24 |
esa | esa 2976 |     6     6    18 |U    5     7    19 |    14    16    22 |
gfz | gfz 2971 |U    6     6    18 |U    6     8    23 |U   14    15    24 |
grg | grg 2976 |U   17    16    40 |U   11    15    44 |    23    34    43 |
igr | igr 2971 |     6     5    17 |     5     7    19 |    12    12    19 |
igs | igs 2966 |     6     6    17 |     5     6    20 |    13    15    20 |
jpl | jpl 2971 |     8     8    20 |U    6     8    24 |    19    22    31 |
mit | mit 2976 |     6     6    18 |U    7    10    26 |U   14    12    28 |



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 5.1691.0   GPS week: 1691   Day: 0   MJD: 56081.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     5     6    16 |     6     7    21 |     6     8    20 |
emr | emr 2971 |     9     8    15 |     8    10    29 |    12    16    23 |
esa | esa 2976 |     5     6    15 |     6     9    20 |     7    10    22 |
gfz | gfz 2970 |     6     6    16 |     5     8    24 |     7    10    22 |
grg | grg 2976 |    15    16    30 |    10    18    37 |    28    27    60 |
igr | igr 2975 |     5     6    14 |     6     7    21 |     7     9    18 |
igs | igs 2972 |     6     6    14 |     5     8    21 |     7    10    20 |
jpl | jpl 2971 |    12    12    18 |     6     8    25 |    12    20    37 |
mit | mit 2976 |     5     5    14 |     7     9    29 |     9    12    25 |

Table 5.1691.1   GPS week: 1691   Day: 1   MJD: 56082.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     5     5    12 |     6     8    21 |    10    18    21 |
emr | emr 2880 |    12     9    20 |    11     8    25 |    23    20    26 |
esa | esa 2976 |     6     6    13 |     7     8    21 |    22    19    27 |
gfz | gfz 2971 |     6     5    13 |     7     8    23 |    23    19    31 |
grg | grg 2976 |    27    23    51 |    17    19    57 |    28    36    38 |
igr | igr 2975 |     6     5    14 |     7     7    21 |    20    15    21 |
igs | igs 2941 |     6     5    13 |     7     6    21 |    20    14    22 |
jpl | jpl 2972 |     6     8    16 |     8    10    23 |    23    15    32 |
mit | mit 2976 |     6     6    14 |    10    19    34 |    25    13    38 |

Table 5.1691.2   GPS week: 1691   Day: 2   MJD: 56083.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     4     3    10 |     6     6    23 |    10    16    17 |
emr | emr 2972 |     8     5    18 |    11     6    24 |    24    33    22 |
esa | esa 2976 |     4     4    11 |     6     5    21 |    13    18    18 |
gfz | gfz 2971 |     4     4    11 |     6     7    23 |    11    16    18 |
grg | grg 2976 |    11    13    25 |    11    14    59 |    14    40    32 |
igr | igr 2976 |     4     3    11 |     6     6    21 |     9    11    17 |
igs | igs 2972 |     4     3    11 |     6     4    21 |    13    20    17 |
jpl | jpl 2972 |     5     4    13 |     6     6    26 |    23    31    24 |
mit | mit 2976 |     4     3    12 |     6     5    28 |    10    10    20 |

Table 5.1691.3   GPS week: 1691   Day: 3   MJD: 56084.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     6     4    15 |     5     7    18 |  ----  ----  ---- |
emr | emr 2972 |    10     9    28 |    11    10    26 |  ----  ----  ---- |
esa | esa 2976 |     6     4    18 |     6     6    16 |  ----  ----  ---- |
gfz | gfz 2971 |     7     4    18 |     6     8    24 |  ----  ----  ---- |
grg | grg 2976 |    25    23    51 |    15    18    75 |  ----  ----  ---- |
igr | igr 2976 |     7     3    17 |     6     6    16 |  ----  ----  ---- |
igs | igs 2966 |     6     4    18 |     6     7    18 |  ----  ----  ---- |
jpl | jpl 2972 |     7     4    22 |     6     7    21 |  ----  ----  ---- |
mit | mit 2976 |     6     3    19 |     7     9    25 |  ----  ----  ---- |

Table 5.1691.4   GPS week: 1691   Day: 4   MJD: 56085.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     9     8    23 |     5     5    14 |  ----  ----  ---- |
emr | emr 2972 |    11    13    32 |     8     7    23 |  ----  ----  ---- |
esa | esa 2976 |     9     8    24 |     4     5    13 |  ----  ----  ---- |
gfz | gfz 2972 |     9     8    25 |     4     6    19 |  ----  ----  ---- |
grg | grg 2976 |    17    16    56 |     7    11    20 |  ----  ----  ---- |
igr | igr 2968 |     9     7    24 |     4     6    14 |  ----  ----  ---- |
igs | igs 2967 |     9     8    25 |     3     5    14 |  ----  ----  ---- |
jpl | jpl 2972 |    10     9    25 |     4     6    20 |  ----  ----  ---- |
mit | mit 2976 |     9     8    26 |     4     8    20 |  ----  ----  ---- |

Table 5.1691.5   GPS week: 1691   Day: 5   MJD: 56086.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2975 |     7     8    22 |     5     8    27 |  ----  ----  ---- |
emr | emr 2972 |    11    11    31 |     9     8    34 |  ----  ----  ---- |
esa | esa 2976 |     8     9    24 |     5     8    25 |  ----  ----  ---- |
gfz | gfz 2971 |     8     8    24 |     5     7    26 |  ----  ----  ---- |
grg | grg 2976 |    16    15    42 |     8    11    35 |  ----  ----  ---- |
igr | igr 2954 |     8     7    22 |     5     7    23 |  ----  ----  ---- |
igs | igs 2972 |     8    10    24 |     5     7    24 |  ----  ----  ---- |
jpl | jpl 2972 |     9    10    24 |     7     8    31 |  ----  ----  ---- |
mit | mit 2976 |     8    11    24 |     6     9    25 |  ----  ----  ---- |

Table 5.1691.6   GPS week: 1691   Day: 6   MJD: 56087.0

CENT| CLK EPO  |        BRUX       |        TOW2       |        WILL       |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2976 |     4     5    16 |     5     8    24 |  ----  ----  ---- |
emr | emr 2972 |     7     6    21 |    10    11    27 |  ----  ----  ---- |
esa | esa 2976 |     4     5    18 |     5     8    20 |  ----  ----  ---- |
gfz | gfz 2972 |     5     5    18 |     5     8    21 |  ----  ----  ---- |
grg | grg 2976 |     8     8    26 |     6    10    25 |  ----  ----  ---- |
igr | igr 2975 |     5     5    17 |     5     8    20 |  ----  ----  ---- |
igs | igs 2976 |     5     5    17 |     6     8    22 |  ----  ----  ---- |
jpl | jpl 2972 |     6     6    19 |     6     8    26 |  ----  ----  ---- |
mit | mit 2976 |     5     8    18 |     6    10    23 |  ----  ----  ---- |


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 6.1691   GPS week: 1691   MJD: 56081.500-56087.500

                                                         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     -41      53      48     -4 |       2     18
            |      12      35     103     143      3 |       3
emr   uuuuu |      51      13      43     225     11 |      22     30
            |      16      15      32      74      9 |       4
esa   uuuuu |      -8     -22     -22    -122      0 |      11     24
            |      16      13      77      96      6 |       3
gfz   uuuuu |     -61     -20     -35    -102      1 |       8     23
            |      18      18      45      88      3 |       3
grg   uuuux |      17     -15      10    -201     26 |     -12     72
            |      14      12      30     109     17 |      20
igr   xxxxx |     -26       2       7       5     -6 |       0     20
            |      10      10      41      43      7 |       4
irf   xxxxx |       5     -17      -8     -11      0 |       4     20
            |       5       9      34      19      3 |       3
jpl   uuuuu |      31       7      51      48      9 |      14     27
            |      34      36      99      25      9 |       3
mit   uuuuu |      -9     -12     -15      28     -1 |      11     21
            |      27      20     143      89      3 |       3
ngs   uuuuu |       1      10      68     106     -7 |       9     16
            |      35      34     109      98      7 |       2
sio   uuuuu |      59     141    -121     219      7 |      36     41
            |      11      17      85      44      5 |       3


Table 7.1691.0   GPS week: 1691   Day: 0   MJD: 56081.500

                                                         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     -36      56     156     -5 |       4     16
emr   uuuuu |      22     -13      -7     191     -1 |      21     27
esa   uuuuu |       3     -28     -94      12      6 |      12     21
gfz   uuuuu |     -72     -16     -50    -105      0 |      11     22
grg   uuuux |      -7      -8       8    -151     18 |     -38     84
igr   xxxxx |     -33     -11      45      29     -7 |       4     16
irf   xxxxx |       4     -22       2       3      3 |       5     17
jpl   uuuuu |       5       9      -5      60     15 |      12     23
mit   uuuuu |     -29     -27     136     -72      0 |      13     21
ngs   uuuuu |      67      55     227      -4    -10 |      10     14
sio   uuuuu |      75     133    -213     252     12 |      34     37

Table 7.1691.1   GPS week: 1691   Day: 1   MJD: 56082.500

                                                         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 |      24     -33       1      42     -4 |       7     18
emr   uuuuu |      39       5      74     211      2 |      23     30
esa   uuuuu |      18      -7     -57      -1    -12 |      15     25
gfz   uuuuu |     -40     -45     -28     -83      0 |      12     24
grg   uuuux |       4     -12      -8    -205     46 |     -29     81
igr   xxxxx |     -12       6      13       9    -19 |       6     18
irf   xxxxx |       5      -3     -32     -23     -1 |       7     21
jpl   uuuuu |     -17     -71     248      33      2 |      16     28
mit   uuuuu |     -31      25      -4     -81      0 |      14     23
ngs   uuuuu |      10      13      11      87      2 |      12     17
sio   uuuuu |      63     174    -184     196     11 |      37     42

Table 7.1691.2   GPS week: 1691   Day: 2   MJD: 56083.500

                                                         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 |       5     -54     -34    -166     -5 |       1     16
emr   uuuuu |      58      18      57     169      9 |      18     25
esa   uuuuu |      -6      -9     -48    -100     -5 |       9     23
gfz   uuuuu |     -49     -38      35    -163     -2 |       6     20
grg   uuuux |      28     -28      11    -332     35 |     -23     78
igr   xxxxx |     -17      10       4      45    -12 |      -2     19
irf   xxxxx |      -6     -10       4     -43     -1 |       2     18
jpl   uuuuu |      49       3      48      65     13 |      11     25
mit   uuuuu |     -41     -13      39      63     -2 |       9     19
ngs   uuuuu |       2       6     -51     143     -5 |       8     15
sio   uuuuu |      39     145     -66     245     11 |      33     38

Table 7.1691.3   GPS week: 1691   Day: 3   MJD: 56084.500

                                                         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       9     133     140     -3 |      -1     17
emr   uuuuu |      65      35      49     235     15 |      18     25
esa   uuuuu |      -8     -14     -87    -162      2 |       7     23
gfz   uuuuu |     -53     -17     -42     -55      5 |       4     20
grg   uuuux |      27       5       0    -290      4 |     -15     74
igr   xxxxx |     -39       7     -75     -53      0 |      -4     21
irf   xxxxx |       7     -15      57      12      0 |       1     19
jpl   uuuuu |      92      29      12      33      0 |      10     25
mit   uuuuu |     -11     -27     148     171     -3 |       8     19
ngs   uuuuu |     -47     -23     -66     -42     -8 |       7     15
sio   uuuuu |      55     142      31     288      5 |      33     38

Table 7.1691.4   GPS week: 1691   Day: 4   MJD: 56085.500

                                                         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 |     -12     -98     -24      -7     -8 |       1     18
emr   uuuuu |      52       8      24     148     23 |      21     29
esa   uuuuu |     -22     -17     -40    -173      1 |       9     24
gfz   uuuuu |     -50     -10      -8      -6     -2 |       6     22
grg   uuuux |      16     -30      57    -294      4 |      -5     68
igr   xxxxx |     -18     -12      24      53     -2 |      -2     22
irf   xxxxx |       5     -22     -14     -22     -3 |       3     20
jpl   uuuuu |      36      26      35       6      4 |      13     26
mit   uuuuu |       1     -20     -51      65     -2 |       9     20
ngs   uuuuu |      -4       3     104     167     -8 |       8     16
sio   uuuuu |      63     133     -89     198      6 |      36     41

Table 7.1691.5   GPS week: 1691   Day: 5   MJD: 56086.500

                                                         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 |      15     -12     246     -74      1 |      -1     18
emr   uuuuu |      53      17      22     248     19 |      23     31
esa   uuuuu |     -29     -38     108    -241      6 |       9     24
gfz   uuuuu |     -70     -23    -113     -38      1 |       6     22
grg   uuuux |      28     -21     -36     -85     35 |       3     62
igr   xxxxx |     -29      12      -8     -53      2 |      -3     21
irf   xxxxx |       6     -32     -24       0      3 |       3     20
jpl   uuuuu |      27      21     -68      70     24 |      13     27
mit   uuuuu |      13     -28    -117      62      5 |       8     20
ngs   uuuuu |       0      53     163     168    -20 |       7     15
sio   uuuuu |      57     118    -156     168      7 |      37     42

Table 7.1691.6   GPS week: 1691   Day: 6   MJD: 56087.500

                                                         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 |       0     -63     -10     246     -3 |       4     23
emr   uuuuu |      71      22      84     372      9 |      28     40
esa   uuuuu |     -11     -38      62    -188      1 |      14     31
gfz   uuuuu |     -92       8     -40    -265      2 |      11     27
grg   uuuux |      23     -13      37     -54     42 |      21     61
igr   xxxxx |     -32       4      43       3     -5 |       0     25
irf   xxxxx |      13     -18     -50      -2     -5 |       7     25
jpl   uuuuu |      25      32      88      70      4 |      19     37
mit   uuuuu |      34       7    -257     -13     -2 |      13     27
ngs   uuuuu |     -21     -34      88     224     -3 |       8     18
sio   uuuuu |      62     142    -169     182     -2 |      42     49



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