Subject: [IGSREPORT-3794] Wk 0906 IGS Final Orbits
From: AC Coordinator / NRCan GSDivision
Date: Tue, 3 Jun 1997 18:26:09 PDT

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IGS Electronic Report    Tue Jun  3 18:26:09 PDT 1997      Message Number 3794
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0906 IGS Final Orbits

Final IGS Orbit Combination - Week 0906   (May 18, 1997 - May 24, 1997)

Contacts: J. Kouba ([email-masked])
          Y. Mireault ([email-masked]), F. Lahaye ([email-masked])

COMBINATION STRATEGY:

For a complete description of combination strategy, please refer to the report
posted on CDDIS (IGS09067.SUM).

SOFTWARE:

  The weighted average software used was developed by T. Springer and
G. Beutler during 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, Kouba and Springer, 1995, Combining the orbits of the IGS Analysis
   Centers, Bulletin Geodesique, 69, pp 200-222.

   Kouba, Mireault and 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.

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 (weights are those from the orbit combination). 
Pole rate combination uses only centres providing estimated pole rates.
These values are supplemented with the current IERS Bulletin A UT1-UTC values. 

  The Final Orbit files generated and uploaded into CDDIS @ NASA/GSFC are:

 IGS09060-6.SP3  IGS GPS ephemeris files for days 0-6, week 0906 in SP3 format.
 IGS09067.ERP    Earth rotation parameters (ERP) associated with ephemerides.
 IGS09067.SUM    Complete report.

REMARKS on IGS Final Orbit Combination:

1. The centres used in the clock combination are COD, EMR, ESA, GFZ and JPL. The
   other centres are excluded because they either 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. Only the GFZ "exact" clock corrections (one epoch out of two) are included
   in the combination and RMS computation (no "interpolation" values).

3. Rapid ("IGR") orbits/clocks are included in the combination for statistics
   only.

4. The following centre clock solutions, which provide broadcast clock
   corrections, were excluded from the combination but kept in the combination
   statistics:
            -> Centre: NGS 

5. Centre clock weights were determined using the following non-SA satellites:

                  Day | PRN list
                  ----+---------
                  0-6 |  15 

6. The following orbit solutions were excluded from the combination because 
   they were biasing the weighted average (generally indicated by long arc RMS).
   They were still used for statistics computation.

                  Day | Centre | PRN list
                  ----+--------+---------------
                   2  |  EMR   |  ALL (High Rotations - see Table 2)

7. State vector resets were modeled for the following satellites to
   alleviate the effects of modeling problems, experienced by all centres,
   in the Long Arc (LA) process:

          Day (Date) |   TIME   |  PRN  | Centres  | Reason
         ------------+----------+-------+----------+-------------------
          2 (May 20) | 00:00:00 | 17,23 |   All    | Modeling problems
          2 (May 20) | 00:00:00 |   29  |   All    | Modeling problems (a)
          3 (May 21) | 00:00:00 |   19  |   All    | Modeling problems
          6 (May 24) | 00:00:00 |   30  |   All    | Modeling problems (b)

  (a) Due to unrealistic long arc RMS, PRN29 was excluded from the long arc 
      evaluation on day 1 for ACs that submitted solutions for this satellite;

  (b) Due to unrealistic long arc RMS, PRN30 was excluded from the long arc 
      evaluation on day 5 for ACs that submitted solutions for this satellite;

8. Centre specific UT1-UTC values for NGS were not used in the long arc
   evaluation.  Smaller RMS were obtained when UT1-UTC values from Bulletin A
   were used.

9. Starting with GPS wk 0894, IGS LOD combinations were implemented in the 
   Final IGS solutions. The LOD combination uses AC LOD and AC orbit weights
   (for the time being) to determine combined IGS LOD values together with 
   integrated UT1-UTC values starting from the most current (and non predicted)
   UT1-UTC value of Bulletin A.

   AC LOD biases with respect to Bulletin A are estimated using Bulletin A
   most recent 3 weeks (21 days), i.e. up to the most current (and non
   predicted) UT1-UTC value 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 used to integrate UT1-UTC.

10.SIO solutions were not used in the combination due to late submission.

ORBIT COMBINATION AND EVALUATION STATISTICS:

For a complete description of tables and statistics, please refer to the report
posted on CDDIS (IGS09067.SUM).

Table 1: Week 0906 summary.                       (May 18, 1997 - May 24, 1997)

Table 1.0906.a   GPS week: 0906   MJD: 50586.0-50592.0

         Mean and standard deviations of transformation parameters.
         WRMS - orbit RMS weighted by the SP3 header accuracy codes.
         STA  - Mean number of stations in the daily solutions.
         Units: meters, mas, ppb, nano-sec, nano-sec/day.

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  79 | .00  .01 -.01  -.18   .07   .12  -.3  .06  .05 |    5.6   -4.1     .5
        | .00  .00  .00   .11   .05   .13   .1           |    9.1   15.8
emr  33 | .01 -.02  .00   .37   .07   .57   .0  .10  .10 |  456.7   63.0     .5
        | .01  .00  .01   .08   .09   .42   .2           |  145.3   14.6
esa  55 | .00  .00  .01  -.15  -.10  -.11   .1  .09  .07 |    7.4  -31.4    1.7
        | .01  .00  .01   .09   .13   .13   .1           |   14.8   15.0
gfz  54 | .00  .00  .00   .05   .06  -.26  -.2  .06  .06 |  458.2   63.5     .5
        | .00  .00  .00   .05   .03   .13   .1           |  145.4   14.6
igr  n/a| .01 -.02  .00   .10   .09   .03  -.1  .09  .06 |     .0    -.3     .5
        | .00  .01  .00   .16   .08   .16   .1           |     .5    1.0
jpl  37 | .00  .01  .00   .00  -.09  -.02   .3  .07  .07 |  458.0   63.3     .4
        | .00  .00  .00   .09   .11   .11   .1           |  145.4   14.5
ngs  53 | .01 -.05  .00  -.02  -.06  -.09   .2  .17  .17 |    3.2   -5.4  132.0
        | .01  .01  .01   .15   .22   .28   .1           |   10.5   18.5

Table 1.0906.b   GPS week : 0906   MJD: 50586.0-50592.0

         Satellite position sigmas for the combined orbits
         (coded in the IGS SP3 orbit files).
         "E" flags eclipsing satellites.
         Units: cm.

              Day of GPS week
 PRN  |   0   1   2   3   4   5   6 |  Remarks
------|-----------------------------|------------------------------------------
   1  |   3   3   4   3   3   2   3 |
   2E |   2   3   3   4   3   3   3 |
   3  |   2   2   3   4   3   3   3 |
   4E |   3   3   4   4   4   3   3 |
   5E |   2   3   3   4   3   4   3 |
   6  |   2   9   3   3   3   3   3 |
   7  |   2   2   3   3   3   3   3 |
   9  |   3   4   3   3   3   3   3 |
  10  |   2   3   4   5   3   3   3 |
  14  |   3   4   2   3   3   2   3 |
  15E |   3   4   3   3   4   3   4 |
  16  |   2   3   2   3   3   3   3 |
  17E |   3   4   3   5   4   4   4 |
  18  |   3   3   3   3   3   2   3 |
  19  |   3   4   5   3   3   3   3 |
  21  |   3   4   3   3   3   3   3 |
  22E |   3   4   3   3   3   3   3 |
  23  |   3   7   6   7   6   6   6 |
  24E |   4   3   3   4   3   3   3 |
  25  |   2   3   2   2   3   2   3 |
  26  |   3   3   3   4   3   3   3 |
  27  |   3   3   3   3   3   3   2 |
  29  |   2  44   2   5   0  11  10 | Modeling problems on days 1,4-6.
  30E |   4   3   3   4   4   8   6 |
  31  |   2   3   3   4   3   3   3 |

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.
         Units: meters, mas, ppb, nano-sec, nano-sec/day.

Table 2.0906.0   GPS week: 0906   Day: 0   MJD: 50586.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  81 | .00  .01 -.01  -.33   .01   .10  -.2  .05  .05 |   11.9  -22.7     .4
emr  32 | .01 -.02  .00   .27   .06   .70   .2  .10  .10 |  262.5   41.8     .4
esa  57 | .00  .00  .00  -.09   .06  -.21   .1  .06  .06 |   14.0  -42.1     .9
gfz  53 | .00  .00  .00   .09   .03  -.14  -.2  .04  .04 |  264.1   42.2     .4
igr  n/a| .00 -.02  .00   .00   .16  -.02   .0  .05  .04 |    -.4     .0     .4
jpl  37 | .00  .01  .01   .08  -.12  -.15   .3  .05  .05 |  263.7   42.3     .3
ngs  54 | .02 -.07  .01  -.09   .23   .36   .1  .14  .15 |   17.6  -32.6   79.8

Table 2.0906.1   GPS week: 0906   Day: 1   MJD: 50587.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  81 | .00  .01 -.01  -.29   .10   .24  -.1  .09  .05 |    6.2  -19.5     .5
emr  34 | .00 -.02  .01   .42   .05   .09   .1  .11  .11 |  318.7   52.7     .5
esa  56 | .01  .01  .00  -.11  -.04  -.18   .1  .09  .07 |    1.4  -45.0    1.8
gfz  53 | .00  .00  .00   .05   .03  -.05  -.1  .05  .05 |  320.0   53.3     .4
igr  n/a| .01 -.03  .00   .30   .05   .05  -.2  .18  .08 |    -.7    1.7     .7
jpl  37 | .00  .01  .01  -.05   .08  -.18   .1  .13  .13 |  319.9   53.0     .5
ngs  54 | .01 -.06  .00  -.02  -.34  -.46   .3  .22  .20 |   -2.4   -8.5   79.7

Table 2.0906.2   GPS week: 0906   Day: 2   MJD: 50588.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  81 | .00  .01 -.02  -.06   .06   .33  -.3  .04  .04 |   -1.9   11.2     .5
emr  34 | .01 -.02 -.01   .51   .01  1.22   .0  .11  .11 |  381.4   70.0     .5
esa  54 | .00  .00  .00  -.18  -.27  -.23   .1  .07  .06 |  -20.3  -25.0    1.3
gfz  53 | .00  .00  .00   .12   .09  -.27  -.2  .06  .06 |  382.6   70.6     .5
igr  n/a| .01 -.03  .00   .14  -.06   .18  -.2  .07  .06 |     .4    -.4     .4
jpl  37 | .00  .01  .01   .13   .01   .15   .3  .04  .04 |  382.6   70.4     .4
ngs  53 | .02 -.06  .00  -.13  -.01  -.39   .4  .17  .17 |   -8.3   14.2   82.2

Table 2.0906.3   GPS week: 0906   Day: 3   MJD: 50589.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  79 | .00  .01 -.01  -.19   .00   .06  -.2  .05  .05 |   -1.2   10.4     .4
emr  29 | .01 -.02  .01   .34   .25   .74   .1  .11  .11 |  448.8   82.6     .4
esa  56 | .01  .01  .01  -.13  -.16  -.11   .2  .09  .07 |   26.2   -8.0    2.2
gfz  53 | .00  .00  .01   .02   .10  -.38  -.3  .06  .06 |  450.2   83.0     .4
igr  n/a| .00 -.02  .00   .14   .06   .01   .0  .06  .05 |     .4   -1.1     .4
jpl  37 | .00  .01  .00   .05  -.22   .01   .4  .05  .05 |  450.2   82.7     .4
ngs  48 |-.01 -.06  .00   .00   .23  -.11   .0  .18  .18 |   -6.8   19.1  289.2

Table 2.0906.4   GPS week: 0906   Day: 4   MJD: 50590.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  79 | .00  .01 -.01  -.26   .14   .04  -.3  .05  .05 |   17.0  -10.4     .6
emr  34 | .01 -.01  .00   .36   .01   .24   .1  .09  .09 |  536.7   53.7     .6
esa  53 | .00  .00  .01  -.04  -.21   .10   .1  .09  .07 |   15.8  -46.4    1.5
gfz  54 | .00 -.01  .00   .03   .08  -.40  -.3  .06  .06 |  538.2   54.3     .6
igr  n/a| .01 -.02  .00   .23   .13  -.23   .0  .07  .06 |    -.5    -.8     .6
jpl  36 | .00  .01  .00  -.14  -.11   .02   .3  .06  .06 |  538.0   53.9     .5
ngs  54 | .01 -.04  .00   .28  -.21  -.04   .2  .16  .15 |   17.2  -22.8   79.2

Table 2.0906.5   GPS week: 0906   Day: 5   MJD: 50591.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  77 | .00  .01 -.01  -.09   .11   .12  -.2  .05  .05 |   14.1  -12.6     .6
emr  34 | .00 -.01  .00   .27   .01   .16  -.3  .08  .08 |  596.4   63.0     .5
esa  56 | .01  .00  .00  -.19   .05   .04   .2  .09  .08 |   12.0  -36.4    1.8
gfz  54 | .00  .00  .00   .06   .06  -.30  -.2  .05  .05 |  598.2   63.0     .5
igr  n/a| .01  .01  .00  -.17   .19   .28   .0  .06  .05 |     .4   -1.1     .7
jpl  37 | .00  .01  .01  -.05  -.23  -.03   .4  .06  .06 |  597.9   63.1     .5
ngs  54 | .00 -.05 -.01  -.16  -.22  -.01   .2  .18  .17 |    2.6   -1.7   78.0

Table 2.0906.6   GPS week: 0906   Day: 6   MJD: 50592.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  78 | .00  .02 -.01  -.08   .07  -.07  -.3  .06  .05 |   -6.7   15.1     .5
emr  33 | .02 -.02  .00   .39   .12   .85  -.2  .09  .09 |  652.3   77.4     .4
esa  56 |-.01  .00  .01  -.32  -.12  -.22   .2  .10  .07 |    2.7  -16.7    2.2
gfz  55 | .00  .00  .00  -.04   .05  -.30   .0  .06  .06 |  653.8   77.9     .4
igr  n/a| .00 -.02  .00   .06   .09  -.04   .0  .08  .07 |     .5    -.4     .4
jpl  37 | .00  .01  .00  -.04  -.06   .02   .3  .05  .05 |  653.6   77.6     .3
ngs  54 | .01 -.04  .02   .01  -.08   .05   .0  .14  .14 |    2.6   -5.8   80.5

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.
         "T" stands for Total long arc orbit RMS for all satellites.
         "NE" stands for long arc orbit RMS for Non-Eclipsing satellites only.
         "MEDI","MD" stands for median of the centre's satellite RMS.

         Units: cm.

Table 3.0906.0   GPS week: 0906   Day: 0   MJD: 50586.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   6   7   5   4   3   4  14    3 |    8   9   8   8   9   9  11    7
   2  |   6   7   6   2   3   3  13    2 |    6   9   7   5   7   5  12    5
   3  |   6   5   4   2   4   4  17    2 |    5   7   7   4   4   5  12    3
   4E |   6  16   6   4   5   5  17    3 |    9  14   9   9  11   7  20    8
   5  |   3   8   3   3   3   4  15    2 |    9  14   9   8   8   8  17    8
   6  |   4   6   4   6   3   5  11    2 |    5   7   6   7   7   6  17    5
   7  |   4   8   4   4   4   4  10    2 |    5   8   7   4   5   5   8    3
   9  |   6  12   5   5   3   6  13    3 |    4  10  13   5   6   4  14    4
  10  |   4   7   4   4   6   3  13    2 |    4   8   7   6   6   4  13    4
  14  |   5  13   3   2   4   7  15    3 |    7   9   9   5   8   6  16    5
  15E |   5   7   5   3   4   5  14    3 |    6   9   8   7   7   7  20    6
  16  |   3   9   4   2   4   4  14    2 |    5  10   8   5   8   6  14    6
  17E |   4  15   7   3   3   5  19    3 |    3  12   6   5   5   4  16    3
  18  |   5   7  13   6   4   4  14    3 |   22  20  17  20  18  20  24   19
  19  |   4   7 ---   4  15   5  19    3 |    3   8 ---   6  15   5  17    4
  21  |   7   6   6   7   3   5  10    3 |    4   8   5   4   5   7  10    4
  22  |   5   6   6   4   3   4  16    3 |    8  12  11   9   8   7  16    7
  23  |   5   7  10   4   4   4   9    3 |   29  26  27  26  28  28  31   27
  24E |   6  17   4   3   6   6  25    4 |    9  18  11  11  13  10  28   10
  25  |   4   5   5   3   4   4  10    2 |    4   8  10   7   6   4  12    5
  26  |   4  11   6   4   2   5  11    3 |    4  12   9   6   6   7  10    5
  27  |   4  10   7   4   9   4  15    3 |    3  10   8   4   7   4  13    3
  29  |   4   6   4   3   2   3   8    2 |    1   1   1   1   1   1   1    1
  30E |   6  14   6   6   3   6  16    4 |    3  17   6   4   6   4  19    5
  31  |   6   8   6   3   3   3  10    2 |    5   8   8   5   5   4  10    4
------|----------------------------------|----------------------------------
 RMS  |   5  10   6   4   5   5  14      |T   9  12  10   8   9   8  16    8
 WRMS |   5  10   6   4   4   5  15      |NE  9  11  10   9  10   9  15    8
 MEDI |   5   7   5   4   4   4  14      |MD  5   9   8   6   7   6  14    5

Table 3.0906.1   GPS week: 0906   Day: 1   MJD: 50587.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   7  10   7   5  12   5  16    3 |    5  11   8  10  13   8  11    5
   2  |   5   8   8   5   4   5  17    3 |    5   9  10   6   8   6  15    6
   3  |   3   6   6   3   5   5  14    2 |    3   8   8   3   6   6  12    3
   4E |   5  10   7   4   8   6  14    3 |    7  14   9   9  10   7  21    7
   5  |   5   9   4   3   6   7  23    3 |    8  12  12   6   9   9  23    7
   6  |   9  15   8 ---  24  15  59    9 |    4  18  10 ---  27  10  61    7
   7  |   4   7   5   3   6   3  13    2 |    4  10   8   4   6   4  10    4
   9  |   6  15   6   5   8   6  18    4 |    3  15  10   5  10   3  19    5
  10  |   4  10   6   5   7   6  16    3 |    3  11   8   4  10   6  14    4
  14  |   7  13   4   3   8  13  22    4 |    7  17   6   5  10  11  18    5
  15E |   4  11   6   4   7   8  26    4 |    6   9  10   9  11   7  23    6
  16  |   5   6   4   3   5  11  24    3 |    5  10   8   6   8  10  19    5
  17E |   4  14  12   4   8   5  20    4 |    3  10   6   6   6   4  15    4
  18  |   4   9   9   3   6   7  21    3 |    4  12   9   5   8   5  22    5
  19  |   6  14   6   4   8   5  18    4 |    4  14   7   5  10   4  21    4
  21  |   5  13   9   8   8   7  16    4 |    3  13  10   4   8   4  15    3
  22  |   5  15   8   6   4   7  16    4 |    7  20   9   7  10   6  23    7
  23  |   8  15  29   8  10   9  25    7 |   42  42  21  40  41  41  55   38
  24E |   5   6   7   4  12   6  16    3 |    8  14  12   9  14   8  19    9
  25  |   5  11   6   5   4   7  21    3 |    5  16   6   5   9   7  22    5
  26  |   4   9   9   5   5   3  12    3 |    4  11   8   6   7   4  12    4
  27  |   4  11   7   4   5   5  17    3 |    3  10  11   4   8   7  15    4
  29  |  37 --- --- ---  78  53 ---   44 |    0 --- --- ---   0   0 ---  ---
  30E |   6  12   4   3   7   8  19    3 |    3  13   7   4   9   5  24    4
  31  |   4   7   8   4   5   5  12    3 |    3  12   8   5   6   5  15    4
------|----------------------------------|----------------------------------
 RMS  |   9  11   9   5  18  13  22      |T   9  15   9  10  13  10  24    9
 WRMS |   5  11   7   5   8  13  20      |NE 10  15   9  10  13  11  24    9
 MEDI |   5  11   7   4   7   6  18      |MD  4  12   9   5   9   6  19    5

Table 3.0906.2   GPS week: 0906   Day: 2   MJD: 50588.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5   9   7  11   5   5  14    4 |    5   8  12  12   6   6  13    5
   2E |   4   7   9   4   7   4  17    3 |    5  10  11   6   8   5  18    5
   3  |   5  12   6   4   6   3  16    3 |    3  13   8   6   9   6  17    3
   4E |   3   8   4   6  11   4  25    4 |    6  11  11   7  12   6  26    5
   5  |   3   8   4   4   6   3  20    3 |    9  13  16   8   9   9  20   10
   6  |   5  12   3   8   5   5  10    3 |    4  13  10   6   9   8  18    5
   7  |   4   8   4   4   8   3  16    3 |    3   7   8   4   9   3  11    3
   9  |   4  17   6   5   6   5  22    3 |    3  18  13   3   8   5  22    4
  10  |   4  10   6   9   7   4  20    4 |    4  12  15   6   9   5  16    6
  14  |   3  13   6   5   5   4  12    2 |    4   9   8   6   8   4  10    5
  15E |   4   9   6   7   8   4  16    3 |    5  10   9  10  12   5  17    6
  16  |   3  12   6   4   4   3  12    2 |    7  11  10   9   9   9  11    8
  17E |   4  19   6   7   9   3  17    3 |   12  18  13  15  11  13  16   12
  18  |   3  10   5   7   6   4  10    3 |    6  10   9   6   6   6  12    6
  19  |   6   9  14   4   8   8  16    5 |    9  13   7  10  15  11  19    9
  21  |   5   9   6   7   4   6  11    3 |    3   8   7   6   7   6  11    5
  22E |   4   7   5   6   5   4  13    3 |    8  10  11   8   8   7  15    7
  23  |   8  15  21  13  12   5  20    6 |   34  33  23  34  29  32  28   29
  24E |   5  14   5   5  11   3  20    3 |    9  16  13   8  12   9  24    7
  25  |   4   8   5   4   5   3  13    2 |    4  10   6   5   7   6  17    4
  26  |   6  12   5   4   4   4  17    3 |    4  12  10   5   4   4  13    3
  27  |   2  11   3   3  11   3  19    3 |    3  12   9   4   9   5  18    4
  29  |   3 --- ---   5   5   2   8    2 |    1 --- ---   4   8   3  13    9
  30E |   4   9   5   3   8   3  26    3 |    3  11   7   5  10   5  24    4
  31  |   5   7   6   5   5   3  11    3 |    4  10   7   6   7   4  13    3
------|----------------------------------|----------------------------------
 RMS  |   4  11   7   6   7   4  17      |T   8  13  11   9  10   9  17    8
 WRMS |   4  11   6   6   6   4  17      |NE  9  13  11  10  10   9  16    8
 MEDI |   4  10   6   5   6   4  16      |MD  4  11  10   6   9   6  17    5

Table 3.0906.3   GPS week: 0906   Day: 3   MJD: 50589.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5   9   6   7   4   4   8    3 |    6  10  11   7   5   6  10    5
   2E |   5   9  12   5   5   6  19    4 |    8  14  10   5  10   8  22    8
   3  |   4   9   6   7   4   3  26    4 |    4   9  11   6   7   5  21    4
   4E |   4  10   6   6   8   6  24    4 |    8  11  14   9  12   8  28    8
   5E |   4  12   7   4   6   9  20    4 |    7  14  12   8  10   8  16    6
   6  |   3   8   6   8   4   4  12    3 |    4  11   9   4   8   4  13    4
   7  |   5  10   3   5   9   3  20    3 |    5  11   9   5   8   5  17    4
   9  |   6   8   7   7   3   6  10    3 |    3  10  12   5   5   8  12    5
  10  |   4  18   6  12   5   4  20    5 |    3  15   9   7   8   4  17    4
  14  |   5  12   5   3   6   4  12    3 |    4   9  12   6   7   6  12    5
  15E |   5  10  11   3   6   5  16    3 |    3  11  12   7   8   5  19    4
  16  |   5   9   5   4   3   5  11    3 |    7   9  10   6   8   7  12    6
  17E |   5  20  18   5   6   4  25    5 |   10  13  13  10   7   8  24    8
  18  |   3   6   5   8   3   5   9    3 |    5   9   9   6   6   5  14    6
  19  |   4   8   6   5   8   4  18    3 |    3   9   9   5   8   4  17    3
  21  |   5   8   9   7   6   7  16    3 |    3   9   9   6   6   8  17    4
  22E |   4   9   8   9   4   5  15    3 |    5  13  13   9   8   5  17    6
  23  |   6  22  25   8  14   7  30    7 |   55  48  42  51  48  54  61   50
  24E |   5  13   6   7   8   5  19    4 |    9  17  13  10  14  11  25   10
  25  |   3   7   5   4   3   2  13    2 |    4  10   9   7   7   5  16    5
  26  |   7  14   6   6   4   6  17    4 |    5  15  11   8   7   5  16    5
  27  |   2   9   7   3   7   4  14    3 |    4   9   9   4   7   4  15    3
  29  | ---  11  13   9  10   5   8    5 |  ---   2  13   7   8   4  14   12
  30E |   5   8   5   4   6   4  30    4 |    2  12   9   4   8   5  22    5
  31  |   6   7   8   7   4   3  23    4 |    4  12  11   7   6   3  17    4
------|----------------------------------|----------------------------------
 RMS  |   5  11   9   6   6   5  18      |T  12  14  13  12  12  12  21   11
 WRMS |   5  11   7   6   5   5  18      |NE 14  15  14  13  13  14  20   13
 MEDI |   5   9   6   6   6   5  17      |MD  5  11  11   7   8   5  17    5

Table 3.0906.4   GPS week: 0906   Day: 4   MJD: 50590.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   6   7   4   5   6   6   8    3 |    6  11  17   4   8   9   9    5
   2E |   4   8   9   7   8   4  18    3 |    7  12  17  10  15   9  22    9
   3  |   6   7   5   3   4   6  16    3 |    4   7  17   5   6   6  10    3
   4E |   5   8   8   6   7   5  27    4 |    8  11  17  11  12   8  30    8
   5E |   5   8   7   4   7   4  17    3 |    8  12  21   9  11   8  20    9
   6  |   3   6   9   5   3   5  15    3 |    3   8  16   3   6   3  14    3
   7  |   4   8   5   6   4   4  12    3 |    4  10  14   6   6   6  11    5
   9  |   6   9   6   6   5   7  14    3 |    2  11  19   3   6   7  13    3
  10  |   5   5   4   5   5   6  13    3 |    4  10  17   5   6   3  17    5
  14  |   5  13   6   4   7   6  12    3 |    8  12  14  10  13   6  13    7
  15E |   5   9   7   6   7   5  22    4 |    3  10  15   7   7   6  20    5
  16  |   6   8   4   6   3   9  12    3 |    6   8  17   5   7   8  14    6
  17E |   4  15   9   7   7   6  18    4 |    9  16  18   9  13  10  20    9
  18  |   4  11   5   7   5   7  11    3 |    5  17  16   7   7   6  13    7
  19  |   3   9   7   6   6   7  15    3 |    3  12  11   5   8   4  18    4
  21  |   6   4   4   9   5   4  16    3 |    3   5  20   5   6   6  15    5
  22E |   4   5   7   4   4   5  14    3 |    9  11  21   7  11  11  16    9
  23  |   8  11  30  10   9   5  18    6 |   63  67  41  59  66  62  64   58
  24E |   4  11   7   4   7   4  15    3 |    9  16  17  10  12   9  22   10
  25  |   4   6   6   4   3   8  11    3 |    4   7  15   6   7  10  13    4
  26  |   6   8   7   6   5   4  11    3 |    4   9  16   6   5   5   8    4
  27  |   2  12   7   4   8   5  12    3 |    4  13  17   4   8   5  14    3
  29  | --- ---   2 ---  17 --- ---    0 |  --- ---  12 ---  14 --- ---   12
  30E |   8  11  13   3   4   5  24    4 |    4  14  11   5   8   4  20    6
  31  |   7   9   8   6   6   4   9    3 |    5  11  18   8   8   4  15    4
------|----------------------------------|----------------------------------
 RMS  |   5   9   9   6   7   6  16      |T  14  17  18  13  16  14  20   13
 WRMS |   5   9   7   6   6   6  15      |NE 16  19  18  15  17  16  20   15
 MEDI |   5   8   7   6   6   5  15      |MD  5  11  17   6   8   6  15    5

Table 3.0906.5   GPS week: 0906   Day: 5   MJD: 50591.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5   8   4   5   4   4   8    2 |    6   9   6   4   7   7  10    4
   2E |   4   6   6   5   5   4  19    3 |    5  10   7   7   6   5  19    6
   3  |   6   5   6   5   3   5  18    3 |    4   7   8   4   5   5  15    3
   4E |   4   7   7   5   4   5  19    3 |    6  12   8   9   6   8  21    8
   5E |   4   8   7   5   3  10  22    4 |    5  12  12   6   8  10  20    7
   6  |   2   7   9   5   9   7  22    3 |    4  10   6   3  11   5  21    4
   7  |   3   6   6   4   6   4  18    3 |    3   6   6   4   6   5  14    3
   9  |   6  12   4   5   5   5  16    3 |    3  13  10   4   5   5  17    4
  10  |   5  10   6   5   3   5  15    3 |    3  11   5   5   4   2  10    4
  14  |   4   8   4   2   3   4  14    2 |    6  10   6   7   8   6  15    6
  15E |   5   6  10   5   7   6  19    3 |    4  10  11   8   6   5  20    6
  16  |   6   7   6   3   4   6  14    3 |    3   6   9   6   7   7  12    6
  17E |   4  16  11   6   4   5  20    4 |    8  16  13   9   8   8  21    9
  18  |   5   5   5   4   5   6  11    2 |    2   9   6   4   5   4  13    4
  19  |   2   8   6   5   5   4  24    3 |    2  11   5   6   3   4  21    4
  21  |   4   6  13   7   4   4  13    3 |    4   8  15   5   6   6  13    5
  22E |   4   6   9   7   5   6  17    3 |    6  11  16   8   6   7  17    8
  23  |   8   9  27   6  10   9  26    6 |   67  65  47  64  66  68  68   63
  24E |   4   9   9   4   5   7  16    3 |    8  15  12   9   8  10  16   10
  25  |   5   5   5   3   6   5  16    2 |    5  10   8   6   7   7  17    5
  26  |   6   7  10   5   6   4  12    3 |    3   8   9   5   6   6   9    4
  27  |   3  10   7   4   4   4  16    3 |    3  13   8   5   7   5  15    4
  29  | --- ---   6 ---  11 ---  19   11 |  --- ---  13 ---  16 ---  22   14
  30E |  10 ---  15 ---  10  10 ---    8 |    0 ---   0 ---   0   0 ---  ---
  31  |   6   5   7   4   4   5  16    3 |    4   7   6   5   5   4  12    4
------|----------------------------------|----------------------------------
 RMS  |   5   8   9   5   6   6  18      |T  14  17  13  14  15  15  21   14
 WRMS |   5   8   8   5   5   6  17      |NE 17  18  13  16  17  17  22   16
 MEDI |   5   7   7   5   5   5  17      |MD  4  10   8   6   6   6  17    5

Table 3.0906.6   GPS week: 0906   Day: 6   MJD: 50592.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igr jpl ngs  IGS |  cod emr esa gfz igr jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   4   7   9   3   6   5  10    3 |    8  11  11   6   7   8   9    7
   2E |   5   8   9   6   5   3  16    3 |    6  10  15   7   8   6  17    6
   3  |   5   8   7   4   6   6  19    3 |    4   6  12   3   6   5  14    3
   4E |   4   7   7   4   5   5  16    3 |   10  12  15  11  11   9  19    9
   5E |   5  10   7   6   8   3  11    3 |    6  15  14   9  16   8  16    8
   6  |   5   7   6   7   4   7  11    3 |    4   9  13   4   6   6  10    4
   7  |   4   7   5   5   5   5  14    3 |    5   8  11   6   7   6  10    4
   9  |   4   7   8   4   7   5  14    3 |    4   9  14   5   6   6  13    5
  10  |   3   7   6   3  10   6  12    3 |    3  10  11   3   9   5  11    3
  14  |   3  10   6   3   5   7  10    3 |    5  10  11   7   8   6  12    6
  15E |   5   7   7   4   7   7  24    4 |    4  10  12   6   9   6  19    5
  16  |   5  10   7   2   4   4   9    3 |    4   7  11   4   6   4  10    4
  17E |   8  17  10   5   7   3  15    4 |   12  16  13  11  11  10  18   10
  18  |   6   7   5   9   3   5  12    3 |    7  11  10   8   9   8  14    8
  19  |   4   6   5   4  10   5  14    3 |    4   8   6   4   6   3  16    3
  21  |   4   5   7   7   8   5  14    3 |    3   6   9   4   6   5  11    3
  22E |   4   7   4   5   3   5  13    3 |   10  12  16   9  12  11  17   10
  23  |   7  12  33   7  10   8  20    6 |   56  56  40  53  51  54  49   51
  24E |   5   9   5   5   6   5  13    3 |   11  15  17  12  13  11  19   12
  25  |   4   7   6   3   6   4  14    3 |    4  10  10   6   8   4  16    4
  26  |   8  11  11   5   6   3   9    3 |    5  13  11   7  11   7  10    6
  27  |   4   8   6   3   7   3  12    2 |    4   8  10   5   6   4  11    4
  29  | --- ---   8 ---  11 ---  12   10 |  --- ---  11 ---  17 ---  21   17
  30E |  13  12  17  19  21   9  18    6 |   17  22  16  20  20  17  18   18
  31  |   7   6   4   5   6   5  12    3 |    6   9  14   5   7   4  11    4
------|----------------------------------|----------------------------------
 RMS  |   6   9  10   6   8   5  14      |T  13  15  14  13  14  13  17   12
 WRMS |   5   9   7   6   7   5  14      |NE 14  16  14  14  14  14  17   13
 MEDI |   5   7   7   5   6   5  13      |MD  5  10  12   6   8   6  14    6

Table 4: Precise Navigation Summary.

         Weekly station RMS w.r.t. the initial 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.
	 U    - Station Used in centre's solution (at least one day).
         Units: centimetres.

Table 4.0906   GPS week: 0906   MJD: 50586.0-50592.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2339 |U  45   28   83 |U  40   27   66 |   27   15   42 |
emr | emr 2219 |   45   29   88 |   43   32   69 |U  28   15   44 |
esa | esa 1962 |   53   29   82 |U  48   30   72 |   30   19   50 |
gfz | gfz 1143 |   47   30   85 |U  45   34   74 |   27   19   49 |
igr | igr 2376 |   45   30   87 |   39   30   68 |   27   15   44 |
igs | igs 2363 |   45   28   81 |   40   28   67 |   27   15   43 |
jpl | jpl 2327 |U  44   28   84 |U  39   28   67 |   26   14   42 |

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 initial coordinates 
         for the Latitude, Longitude and Height components.
         
         CLK  - Satellite clocks used.
         EPO  - Number of satellite clock epochs available for that day.
         Units: centimetres.

Table 5.0906.0   GPS week: 0906   Day: 0   MJD: 50586.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2400 |   42   24   90 |   61   30   70 |   32   16   40 |
emr | emr 2196 |   39   28   95 |   65   36   71 |   35   15   46 |
esa | esa 2036 |   47   25   83 |   68   34   76 |   35   19   51 |
gfz | gfz 1189 |   46   25   87 |   78   39   81 |   32   18   46 |
igr | igr 2400 |   41   26   96 |   60   36   74 |   31   16   42 |
igs | igs 2400 |   43   24   88 |   61   31   70 |   32   14   40 |
jpl | jpl 2384 |   41   24   89 |   60   30   68 |   31   14   41 |

Table 5.0906.1   GPS week: 0906   Day: 1   MJD: 50587.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2373 |   44   25   74 |   39   33   56 |   28   18   45 |
emr | emr 2175 |   43   22   80 |   43   37   59 |   30   19   47 |
esa | esa 1875 |   44   25   71 |   52   36   64 |   31   17   50 |
gfz | gfz 1090 |   42   25   74 |   35   34   49 |   31   26   52 |
igr | igr 2373 |   44   30   84 |   39   35   60 |   30   17   45 |
igs | igs 2373 |   42   24   74 |   39   34   57 |   28   17   44 |
jpl | jpl 2357 |   41   25   76 |   38   32   55 |   28   17   44 |

Table 5.0906.2   GPS week: 0906   Day: 2   MJD: 50588.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2395 |   41   28   69 |   35   24   67 |   24   14   39 |
emr | emr 2289 |   42   28   77 |   46   31   74 |   26   16   42 |
esa | esa 1826 |   50   28   74 |   45   28   73 |   27   19   41 |
gfz | gfz 1188 |   38   31   71 |   41   34   81 |   25   18   49 |
igr | igr 2389 |   40   27   72 |   35   25   65 |   25   15   42 |
igs | igs 2395 |   41   27   69 |   35   26   66 |   25   15   40 |
jpl | jpl 2379 |   40   28   70 |   34   25   66 |   25   13   38 |

Table 5.0906.3   GPS week: 0906   Day: 3   MJD: 50589.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2304 |   51   33   84 |   33   22   64 |   24   13   40 |
emr | emr 2173 |   51   34   93 |   31   28   71 |   26   14   39 |
esa | esa 1975 |   55   36   79 |   40   24   73 |   26   16   49 |
gfz | gfz 1166 |   43   36   71 |   28   27   71 |   27   19   46 |
igr | igr 2363 |   51   33   87 |   31   27   65 |   25   14   41 |
igs | igs 2376 |   51   33   85 |   31   25   67 |   24   13   40 |
jpl | jpl 2347 |   51   33   89 |   30   25   69 |   24   13   40 |

Table 5.0906.4   GPS week: 0906   Day: 4   MJD: 50590.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2298 |   44   25   84 |   27   22   57 |   30   15   47 |
emr | emr 2300 |   46   27   85 |   26   27   57 |   28   14   49 |
esa | esa 1891 |   59   25   78 |   33   25   52 |   34   24   56 |
gfz | gfz 1138 |   53   28   90 |   25   28   63 |   25   16   46 |
igr | igr 2321 |   45   30   87 |   25   25   57 |   28   15   50 |
igs | igs 2304 |   43   24   78 |   27   23   55 |   28   15   48 |
jpl | jpl 2277 |   43   26   82 |   25   22   56 |   28   15   48 |

Table 5.0906.5   GPS week: 0906   Day: 5   MJD: 50591.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2302 |   40   28   82 |   37   32   72 |   25   12   45 |
emr | emr 2203 |   41   28   84 |   35   35   74 |   27   14   45 |
esa | esa 2099 |   59   32   94 |   46   35   82 |   32   20   55 |
gfz | gfz 1100 |   43   28   83 |   40   42   86 |   26   14   52 |
igr | igr 2392 |   37   32   81 |   37   35   75 |   26   12   46 |
igs | igs 2387 |   40   31   78 |   37   32   77 |   28   15   50 |
jpl | jpl 2276 |   40   28   81 |   36   32   72 |   25   12   45 |

Table 5.0906.6   GPS week: 0906   Day: 6   MJD: 50592.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2301 |   53   30   94 |   41   26   74 |   22   15   39 |
emr | emr 2196 |   51   31   98 |   40   28   76 |   24   13   37 |
esa | esa 2033 |   54   28   95 |   48   28   79 |   27   19   47 |
gfz | gfz 1133 |   62   33  113 |   46   32   79 |   25   17   53 |
igr | igr 2393 |   53   30  101 |   39   25   76 |   23   14   41 |
igs | igs 2303 |   51   28   94 |   41   26   74 |   23   14   38 |
jpl | jpl 2271 |   51   30   96 |   38   25   76 |   23   13   37 |

[Mailed From: Yves Mireault <[email-masked]>]