Subject: [IGSREPORT-2683] Wk 0853 IGS Rapid Orbits
From: AC Coordinator / NRCan GSDivision
Date: Wed, 29 May 1996 6:13:57 PDT

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IGS Electronic Report    Wed May 29  6:13:57 PDT 1996      Message Number 2683
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0853 IGS Rapid Orbits

Rapid Service IGS Orbit Combination - Week 0853   (May 12, 1996 - May 18, 1996)

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 (IGS08537.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, Springer, 1993, Combining orbits of the IGS processing
   centres, in IGS Analysis Centre Workshop, October 12-14, Ottawa, pp 19-55.

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 are computed using a weighted average of all available centres 
(weights are those from the orbit combination). These values are supplemented 
with the current IERS Bulletin A UT1-UTC values. 

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

 IGS08530-6.SP3  IGS GPS ephemeris files for days 0-6, week 0853 in SP3 format.
 IGS08537.ERP    Earth rotation parameters (ERP) associated with ephemerides.
 IGS08537.SUM    Complete report.

REMARKS on IGS Rapid Service 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. Starting with GPS week 0837, the igp orbits/clocks ("igp" standing for igs 
   preliminary combination) are now included in the rapid combination for 
   statitics only.  Note that the "igp" daily combination is performed on a 
   daily basis within 38 hours of last observation.

4. Centre clock weights were determined using the following non-SA satellites:
   PRN15 and PRN28. 

5. PRN20 was set unusable from day 5/wk0852 (May 10) starting at 15:18 
   until day 1/wk0854 (May 20) at 7:36 (ref. NANU 094-96141).
   No ACs submitted solutions for PRN20 during week 0853.

6. New clock offsets and drifts were estimated for centres showing reference
   clock resets.  Note that only the first 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 (Date)  | Centres  | Shifts/Resets
             -------------+----------+------------------
              2 (May 14)  | EMR GFZ  | ~185 ns (~14:30)

7. State vector resets were modeled for the following satellites to 
   alleviate the effects of modelling problems, experienced by all centres, 
   in the long arc process:

          Day (Date) |   TIME   |  PRN  | Centres  | Reason
         ------------+----------+-------+------------------------------
          2 (May 14) | 00:00:00 | 18    |   ALL    | Modelling problem 
          5 (May 17) | 00:00:00 | 01,14 |   ALL    | Modelling problem (a)
          5 (May 17) | 00:00:00 | 16,19 |   ALL    | Modelling problem (b)
          5 (May 17) | 00:00:00 | 21,23 |   ALL    | Modelling problem 
          5 (May 17) | 00:00:00 | 25,26 |   ALL    | Modelling problem 

  (a) PRN14 was excluded from the long arc evaluation on day 6 (May 18)
      because of severe long arc modeling problems;

  (b) PRN16 and PRN19 were excluded from the long arc evaluation on day 0
      (May 12) because of severe long arc modeling problems;

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

9. SIO solutions were not used in the combination due to late submission to
   CDDIS. These will be used in the Final combination.

ORBIT COMBINATION AND EVALUATION STATISTICS:

For a complete description of tables and statistics, please refer to the report
posted on CDDIS (IGS08537.SUM).

Table 1: Week 0853 summary.                       (May 12, 1996 - May 18, 1996)

Table 1.0853.a   GPS week: 0853   MJD: 50215.0-50221.0

         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  71 | .00  .01  .01  -.04  -.07  -.27   .2  .09  .07 |     .3   -8.1    1.5
        | .01  .01  .00   .11   .05   .17   .1           |    6.3   14.0
emr  31 |-.01  .00 -.01   .48  -.03   .39   .0  .17  .15 | -179.7   23.8     .7
        | .01  .01  .00   .22   .18   .15   .2           |  150.9    8.1
esa  54 | .00  .00 -.01  -.18   .11  -.05   .0  .11  .09 |    3.8  -15.6   11.6
        | .01  .00  .00   .19   .16   .10   .1           |   17.4   85.2
gfz  48 | .01 -.02  .00   .00   .11  -.20  -.3  .08  .08 | -178.2   23.9     .6
        | .01  .02  .00   .11   .07   .12   .1           |  150.9    8.0
igp  n/a| .01  .00  .00   .07  -.01   .20   .0  .11  .07 |     .9   -2.2     .8
        | .01  .01  .01   .15   .10   .12   .1           |    1.2    2.4
jpl  37 |-.01  .03  .01  -.07   .04   .17   .2  .10  .10 | -486.8   33.6     .7
        | .01  .01  .00   .08   .09   .05   .2           | 1054.8   36.3
ngs  48 | .00 -.03 -.02   .00  -.15   .17  -.1  .16  .16 |     .8   -3.8   78.0
        | .01  .01  .01   .18   .32   .16   .2           |    3.8    7.1

Table 1.0853.b   GPS week : 0853   MJD: 50215.0-50221.0

         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   3   3   4   5   3 |
   2  |   5   3   3   3   4   4   5 |
   3  |   3   4   3   4   4   4   4 |
   4E |   5   6   4   5   6   6   5 |
   5  |   4   3   3   3   3   4   3 |
   6  |   4   4   4   3   3   4   4 |
   7  |   3   3   3   4   3   4   4 |
   9E |   5   4   3   3   4   4   4 |
  14  |   3   3   3   3   3  26   4 | Modeling problems on day 5.
  15E |   5   6   5   5   5   6   5 |
  16  |  17   6   4   4   3   6   4 | Modeling problems on day 0.
  17E |   6   6   6   6   6   6   7 |
  18  |   9   5   3   4   4   5   5 |
  19E |  18  20   6   4  13   7  33 | Modeling problems all week.
  21  |   3   3   3   3   4   6   4 |
  22  |   3   4   3   3   4   4   4 |
  23  |   4   4   4   4   5   6   5 |
  24E |   7   5   5   6   5   6   5 |
  25E |   5   4   3   3   4   6   4 |
  26  |   4   3   3   3   4   6   4 |
  27E |   6   5   5   5   7   6   7 |
  28  |   3   3   3   3   3   4   4 |
  29  |   5   4   4   4   5   7   4 |
  31  |   4   3   3   3   5   4   5 |

Table 2: Daily transformation of each centre to the combined IGS orbit and
         clocks for each day of the week. The transformation displayed is the
         sum of a priori and estimated transformations.
         WRMS - RMS weighted by the centres SP3 header accuracy codes.
         STA  - Number of stations in the daily solutions.
         Units: meters, mas, ppb, nano-sec, nano-sec/day.

Table 2.0853.0   GPS week: 0853   Day: 0   MJD: 50215.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  71 |-.02  .01  .02   .13  -.06  -.62   .2  .11  .08 |   -5.7  -10.6    1.5
emr  30 | .00  .00 -.01   .27  -.14   .58  -.1  .17  .15 | -371.2   21.5     .8
esa  52 | .01  .01 -.01  -.45   .32  -.04   .1  .14  .10 |    7.7     .3    1.5
gfz  48 | .01 -.01  .00  -.01   .21  -.04  -.3  .07  .07 | -369.9   21.6     .5
igp  n/a| .00 -.01  .00  -.02   .01   .13   .0  .10  .06 |    2.0   -5.0     .8
jpl  37 |-.02  .01  .01  -.15  -.01   .18   .3  .12  .12 | -370.3   22.0     .6
ngs  49 | .01 -.02 -.03  -.09  -.64   .44   .1  .17  .17 |     .1   -4.3   78.7

Table 2.0853.1   GPS week: 0853   Day: 1   MJD: 50216.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  73 | .00  .01  .01  -.08  -.09  -.25   .2  .09  .07 |     .3   -2.5    1.4
emr  31 | .00 -.01 -.01   .63  -.29   .23  -.2  .19  .17 | -334.5   24.3     .8
esa  55 | .00  .01  .00  -.09   .21   .10   .1  .11  .09 |   23.3   37.5    2.6
gfz  48 | .00 -.01  .00   .00   .15  -.06  -.4  .06  .06 | -333.2   24.8     .7
igp  n/a| .00  .00  .00   .29  -.15   .21  -.1  .11  .06 |    2.2   -3.7     .9
jpl  37 |-.01  .02  .00   .02   .08   .17   .4  .09  .07 |-1474.2    3.5     .8
ngs  50 | .02 -.03 -.01  -.29  -.22  -.07  -.1  .15  .15 |    1.9   -5.9   77.9

Table 2.0853.2   GPS week: 0853   Day: 2   MJD: 50217.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  72 | .00  .00  .01  -.18  -.16  -.16   .2  .06  .06 |     .8     .3    1.4
emr  30 | .00 -.01 -.02   .56  -.07   .42   .0  .14  .13 | -304.3   32.1     .6
esa  54 |-.01  .00 -.01  -.03   .28  -.07   .2  .10  .09 |    5.1 -201.5   17.9
gfz  49 | .01 -.01  .00  -.09   .03  -.25  -.3  .07  .07 | -302.7   32.9     .5
igp  n/a| .00  .01  .00   .04  -.10   .06   .0  .05  .05 |   -1.1    1.5     .9
jpl  37 | .00  .03  .01  -.04   .08   .16   .1  .06  .06 | 1371.7    4.9     .5
ngs  48 | .00 -.05 -.02   .18  -.04   .11  -.1  .13  .13 |   -3.7    4.7   79.5

Table 2.0853.3   GPS week: 0853   Day: 3   MJD: 50218.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  72 | .01  .02  .01  -.10  -.08  -.23   .1  .06  .06 |    1.7   -2.3    1.3
emr  29 | .00 -.01 -.01   .58   .09   .50  -.1  .12  .13 | -104.7   21.3     .6
esa  54 | .00  .00 -.01  -.37   .07   .02  -.1  .10  .09 |  -11.6   28.3   16.9
gfz  50 | .01 -.01  .01  -.02   .05  -.21  -.2  .07  .07 | -103.1   21.0     .5
igp  n/a| .01  .00  .00   .14   .07   .18   .1  .05  .05 |    1.1   -1.0     .7
jpl  37 |-.01  .03  .01  -.07   .18   .24   .1  .07  .07 |-1477.6   79.0     .5
ngs  48 | .00 -.04 -.03   .23  -.36   .12  -.2  .15  .15 |    6.0   -9.9   78.2

Table 2.0853.4   GPS week: 0853   Day: 4   MJD: 50219.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  69 | .01  .00  .01  -.11  -.05  -.22   .3  .08  .07 |   -9.8   10.8    1.4
emr  31 |-.01  .00 -.01   .61   .04   .45   .3  .15  .15 |  -83.3   34.9     .5
esa  55 |-.01  .00 -.01   .06  -.01  -.17  -.2  .10  .09 |    7.4   46.8   17.9
gfz  47 | .00  .00  .00  -.15   .15  -.21  -.2  .08  .08 |  -81.7   34.5     .4
igp  n/a| .01  .00 -.01  -.07   .05   .22   .0  .07  .07 |     .0    -.4     .6
jpl  37 |-.01  .02  .01   .03  -.13   .09   .4  .09  .09 |-1399.0   91.8     .5
ngs  48 | .00 -.04 -.01  -.05   .06   .09  -.5  .14  .14 |   -4.5    6.6   78.7

Table 2.0853.5   GPS week: 0853   Day: 5   MJD: 50220.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  70 | .00  .01  .02   .09  -.06  -.29   .2  .13  .09 |    8.5  -23.0    1.7
emr  31 |-.01  .00 -.01   .07  -.14   .43   .1  .17  .17 |  -47.4   22.4     .8
esa  54 |-.01  .01  .00  -.09  -.09  -.19   .1  .10  .09 |   20.6   -4.4    2.8
gfz  48 | .01 -.04 -.01   .05   .09  -.25  -.3  .11  .11 |  -45.5   22.0     .8
igp  n/a| .01  .01  .00  -.11  -.05   .20   .2  .17  .09 |    1.5   -4.7     .8
jpl  37 |-.01  .04  .01  -.11   .02   .16  -.1  .13  .10 |  -46.4   23.0     .8
ngs  44 | .01 -.02 -.01   .09   .37   .25   .2  .20  .20 |    2.3   -4.6   76.7

Table 2.0853.6   GPS week: 0853   Day: 6   MJD: 50221.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cod  70 | .00  .02  .01  -.02   .01  -.11   .1  .09  .07 |    6.1  -29.4    1.6
emr  32 |-.01 -.01 -.01   .64   .27   .15  -.1  .21  .16 |  -12.2   10.1     .9
esa  53 | .00  .01 -.01  -.28  -.02  -.02   .0  .09  .08 |  -25.8  -16.0    1.8
gfz  47 | .00 -.04  .00   .20   .06  -.41  -.1  .10  .09 |  -11.2   10.8     .6
igp  n/a| .01  .01 -.01   .23   .13   .45  -.1  .14  .10 |     .8   -1.7     .8
jpl  37 | .00  .04  .00  -.17   .05   .21   .2  .14  .15 |  -11.7   11.3     .8
ngs  48 |-.01 -.04 -.02  -.09  -.25   .26   .1  .14  .14 |    3.4  -12.9   76.4

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 (all satellites).
         "NE" stands for Non-Eclipsing satellites long arc orbit RMS.

         Units: cm.

Table 3.0853.0   GPS week: 0853   Day: 0   MJD: 50215.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5   6   9   4   7   6  10    3 |    5   6  10   6   6   6   9    5
   2  |   7  28  11   5   6   6   8    5 |    5  35   9   8  11   8  11    7
   3  |   9  10   8   5   3   5  10    3 |   11  10  10  12  10   9  15   10
   4E |  15  11  11  13   6   7  13    5 |   15  13  15  17  16  13  16   14
   5  |   9   8   9   5   6   5  17    4 |    5   9  10  10   8   7  15    5
   6  |   7   9  18   5   5   6  13    4 |    6   7   8   7   7   6  15    5
   7  |   4  10   8   5   6   6  10    3 |    4   9   9   8   8   5   8    5
   9E |   8  10  21   4   6   8  16    5 |   10  11  14  11  11  12  20   10
  14  |   8  13   6   6   7   7   7    3 |   12   7   8  10  10  11  10    8
  15E |   9  12  17   9   4  10  18    5 |    6  12  12   9   7   8  18    6
  16  |  22  32  32 ---  15  33 ---   17 |    0   0   0 ---   0   0 ---  ---
  17  |   8  18  20   7   4  10  21    6 |   13  13  21  18  14  16  21   15
  18  |  17  28  15  16  16  27  25    9 |   23  31  20  22  21  29  26   20
  19E |  25  37 --- ---  33  19 ---   18 |    0   0 --- ---   0   0 ---  ---
  21  |   4  10   7   3   4   7  10    3 |    4   7   9   6   5   8  12    5
  22  |   6   7   9   7   3   5  13    3 |    6   8   9  11   8   8  11    7
  23  |   8  14  10   3   3   7  16    4 |    7   9   9   6   7   8  16    6
  24E |   9  24  12   8   6   8  34    7 |    9  21   9  12  10   7  22    8
  25E |   7  16  13   6   4   7  19    5 |   13  13  16  13  11   8  23   12
  26  |  10  14  12   4   5   7   9    4 |    3  17  14   7   9   4  11    6
  27E |   7  11  17   8  13   9  29    6 |   17  15  21  14  20  14  26   13
  28  |   7   6   6   5   4   5   9    3 |    5   8   7   8   7   6  12    6
  29  |   8  12   9   6   4  10  21    5 |    7  13   9  10   7   8  20    6
  31  |  11   7   9   6   6   5  16    4 |    9  11   8   7   7   6  11    6
------|----------------------------------|----------------------------------
 RMS  |  11  17  14   7  10  12  17      |T  10  14  12  11  10  10  16    9
 WRMS |   8  15  10   7   6  12  17      |NE  8  14  11  10   9  10  14    8

Table 3.0853.1   GPS week: 0853   Day: 1   MJD: 50216.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5   9  10   4   5   6   8    3 |    5   8   8   7   7   7   9    5
   2  |   6  11   7   5   5   5  16    3 |    5  12   8   7   6   5  15    4
   3  |   6  15  11   6   5   6  10    4 |    7  11   9  13  10   8  15    9
   4E |  10  14  15  12   5  10  17    6 |   10  17   8  12   9  10  20   10
   5  |   7  12   6   5   6   5  12    3 |    6  12   7   7   7   4  17    4
   6  |   7  14  12   5   6   4  20    4 |    6  13   6   8   5   4  14    4
   7  |   6  13   8   7   6   5  11    3 |    5  10   8   9   7   7  11    7
   9E |   5  11  12   6   9   8  18    4 |    8  13  17  10   9   9  22   10
  14  |   4  15   6   5   4   6  11    3 |    8   8  11  12   9  11  16   10
  15E |   7  21  21   6   7   7  21    6 |    7  18  13  11  12   7  20    8
  16  |   5  38  11   8   7   8  11    6 |    7  16   7  12   9   5  13    6
  17E |  12  23  14   7   6   9  23    6 |   12  21  10  15  12  12  24   12
  18  |  14  14  11   5   7   8  18    5 |   23  22  21  17  22  22  22   19
  19E |  27  38 --- ---  47  26 ---   20 |  103 104 --- --- 116 110 ---  104
  21  |   4  16   7   3   4   4   8    3 |    3   7   8   5   5   6  11    4
  22  |   6   6   8   7   5   8  15    4 |    4  12   7   9   6   6  15    6
  23  |   7  18   8   4   8   6  16    4 |    4   8   7   5   7   7  15    5
  24E |   8  27   8   4   6   8  17    5 |    6  21   9   7   8   7  25    8
  25E |   6  12  10   7   5   8  11    4 |    8  11  10  11   9   7  15    7
  26  |   6  10   9   4  12   4   7    3 |    2  16   7   6  12   5  10    4
  27E |   4  26  12   5   9   9  21    5 |   14  23  11  18  15  13  27   13
  28  |   5  12   8   6   4   7   9    3 |    3  10   8   7   6   5  10    4
  29  |   4  12   9   6   6   6  18    4 |    5  10   9   7   6   6  11    5
  31  |   7  13  10   4   3   6  12    3 |    6  15   8   8   8   5  13    6
------|----------------------------------|----------------------------------
 RMS  |   9  19  11   6  11   9  15      |T  22  25  10  10  25  23  16   22
 WRMS |   7  17   9   6   6   7  15      |NE  7  12   9   9   9   8  13    7

Table 3.0853.2   GPS week: 0853   Day: 2   MJD: 50217.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5   9   9   6   3   7   6    3 |    4   9   7  10   5   7   9    5
   2  |   5  15   8   6   4   5   8    3 |    6  14   8   9   5   8  10    5
   3  |   7  10   9   4   5   8  10    3 |    6  10   9  11   8  10  16    9
   4E |   8  11   9  12   4   7  11    4 |    9  14   9  12   9   8  19    9
   5  |   5  10   9   6   5   5  12    3 |    5  11  11   8   7   8  13    5
   6  |   4   8   7   4   5   5  23    4 |    4   7   5   7   5   8  13    3
   7  |   6  10   7   9   4   5  10    3 |    4   7   8   7   5   5   9    4
   9E |   4   6   9   4   8   6  16    3 |    9  14  13  13  10  12  19    9
  14  |   4  11   9   6   5   6   8    3 |   19  18  17  22  22  23  18   19
  15E |   8  17  13   6   5   6  18    5 |    5  14  11  10   8   6  20    7
  16  |   3  16  11   5   3   7  11    4 |    3  12   6   8   5   4  15    4
  17E |  13  18  12  15   4   9  16    6 |   14  22  14  18  12  11  18   11
  18  |   3  10  10   4   5   5   7    3 |   15  12  15  16  14  15  15   14
  19  |   4  27  17  10   6  10 ---    6 |   46  56  25  14  43  53 ---   49
  21  |   4  13  10   5   5   6  10    3 |    4   9   8   6   5   9   9    5
  22  |   4   7   8   4   6   4   9    3 |    5  10   8   8   7   8  11    6
  23  |   4  14   7   6   4   7  17    4 |    5  11   8   6   5   8  16    6
  24E |   8  21  10   6   4   7  17    5 |    7  14   8   8   9   7  23    6
  25E |   5   9  11   6   2   7  10    3 |    9  10  10   9   7   8  12    7
  26  |   6  11  10   6   3   7   5    3 |    4  14  12   7   7   6   9    4
  27E |   4  25  10  10   4   6  11    5 |   15  15  12  21  15  14  15   13
  28  |   4   8   9   6   4   5  11    3 |    4  11   7  10   6   5  10    5
  29  |   3   7   8   6   5   6  18    4 |    4   9   7   8   7   7  13    4
  31  |   5   9  10   9   4   6   5    3 |    5   8  10   9   6   5  11    6
------|----------------------------------|----------------------------------
 RMS  |   6  14  10   7   5   6  13      |T  12  16  11  11  12  14  14   12
 WRMS |   6  13   9   7   5   6  13      |NE 13  17  11  10  13  15  12   14

Table 3.0853.3   GPS week: 0853   Day: 3   MJD: 50218.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   4   9   8   8   3   6  10    3 |    6  10   7  11   6   7   9    6
   2  |   5  10   9   8   3   6   9    3 |    5   8   6  10   6   5  10    5
   3  |   5   8   9   7   5  10  10    4 |    8  10  10  11   8   9  14    8
   4E |  10  14   9  11   5   9  18    5 |    9  10   7   9   9   7  16    6
   5  |   4   9   8   4   4   6  17    3 |    4  10  10   8   7   5  15    5
   6  |   5   8  10   5   5   6  16    3 |    7   7   7   4   5   6  14    4
   7  |   6  13   7  11   6   6  10    4 |    4  10   7   9   5   7  13    6
   9E |   6   8   9   4   5   6  10    3 |   12  13  19  15  11  14  21   14
  14  |   4  13   8   5   4   9   9    3 |   13  19  16  12  14  18  13   14
  15E |   7  21  15   4   5   8  16    5 |    7  10  13  10   9   5  15    6
  16  |   4  13  13   7   7   8  11    4 |    8  11   6   8   6   6  17    6
  17E |  13  11  14  14   4   9  26    6 |   12  11  13  12   7   9  22    8
  18  |   6  12  14   6   7   8   9    4 |   19  12  15  14  14  16  16   14
  19  |   7  14  15   5   8   9  14    4 |   66  70  24  16  64  67  63   68
  21  |   5  13   7   5   3   8  10    3 |    3   8   8   7   4   6   8    4
  22  |   5   6   6   6   4   4  11    3 |    4  11   9  11   9   6  16    7
  23  |   6   9   9   6   4   9  16    4 |    4   8   5   5   5   6  13    5
  24E |   7  26  14   9   4   7  23    6 |    7  17  10   8   7   7  26    5
  25  |   4  10   5   7   3   8  13    3 |    7  10   9   9   6   7  15    6
  26  |   5   9   8   4   4   5  16    3 |    5  10   8   7   5   5  13    5
  27  |   8  15  14   5   6   8  20    5 |   13  20  18  13  13  12  18   12
  28  |   5   7   8   7   5   7  12    3 |    5  10   8   8   6   6  12    4
  29  |   4   8  10   6   7   7  21    4 |    7   6   9   8   5   8  18    6
  31  |   5   9   9   6   4   8  10    3 |    8   8  10   8   7   4  10    6
------|----------------------------------|----------------------------------
 RMS  |   6  12  10   7   5   7  15      |T  15  18  11  10  15  16  19   15
 WRMS |   6  13   9   7   5   7  15      |NE 17  19  11   9  16  17  19   17

Table 3.0853.4   GPS week: 0853   Day: 4   MJD: 50219.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   5  10   9   9   4   8   9    4 |    5  11   7  10   5   6   8    6
   2  |   6  11   9   9   5   6  11    4 |    7   7   7  12   7   6  11    6
   3  |   7   9   7   7   3   9  10    4 |    7  11  10   9   8   9  14    7
   4E |   8  27   9   9   6   9  12    6 |   11  28  12  10  11   7  18    9
   5  |   5  12   8   4   5   4  12    3 |    5  11   9   7   8   5  15    6
   6  |   7   9   9   6   6   4  14    3 |    6   9   7   7   6   5  13    4
   7  |   4  10   6   8   3   6  13    3 |    7   7   9  10   7   5  12    6
   9E |   6   8  12   3   8   7  10    4 |   11  12  21  13  12  12  17   12
  14  |   6  12   9   3   4   5   8    3 |   15   8  21  16  14  16  14   14
  15E |   8  16  14   8   4   6  14    5 |    8  11  13   8  12   7  16    8
  16  |   4  12   8   6   6   4  12    3 |    7   8  10   9   6   7  16    8
  17E |  14  17   9  12   6  11  22    6 |   13  18  10  12   8   9  19    8
  18  |   5  11   9   7  10   8   9    4 |   15  17  16  18  15  13  17   14
  19  |  20  23 --- ---  16  20  28   13 |  111 104 --- --- 113 115  70  111
  21  |   6   9   6   7   3   8  11    4 |    3  10   8   7   4   9   9    5
  22  |   8   7   6   9   7   9  11    4 |    6   8   6   7   8   7  11    5
  23  |   8  14   8   9   5  11  17    5 |    5  11   6   8   9  10  13    6
  24E |   7  18   7  10   7   5  24    5 |    6  13  11   9  11   7  31    8
  25  |   8   8   8   8   4   9   9    4 |    9   9   8  11   7   7  11    7
  26  |  11  13   9   7   8   6  13    4 |    7  15  11   6   8   5  10    5
  27  |   7  31  13  15  16  11  11    7 |   10  25  16  17  11   9  18   11
  28  |   6   6   7   7   3   7  12    3 |    3  10   6   8   6   6  13    5
  29  |   6   6   9  12   4   6  20    5 |    5   7   8  10   6   4  16    4
  31  |   6  14  17   6   7   7   9    5 |    9   9  12  11  10   8  14    6
------|----------------------------------|----------------------------------
 RMS  |   8  15  10   8   7   9  14      |T  24  24  11  10  24  24  20   23
 WRMS |   7  15   9   8   7   9  14      |NE 26  26  10  10  27  27  20   26

Table 3.0853.5   GPS week: 0853   Day: 5   MJD: 50220.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   8  11  10  10   8   6  22    5 |   20  20  20  20  19  21  28   20
   2  |   7  14   5   6   7   5  19    4 |    5  14   7  10  13   6  17    8
   3  |   8   9  10   8   4   9  12    4 |    8  10  11  11   8   9  14    7
   4E |  15  11  11  20   8   8  15    6 |   13  13   9  17  10   7  19   10
   5  |   5  11   8  10   7   6  15    4 |    6  11   8  14   9   7  20    8
   6  |   9  10   5   9   7   5  12    4 |    6  11   6   9   7   8  13    5
   7  |   7  14   7   8   9   5  14    4 |    7  16   7  12  10   5  13    7
   9  |  11   8  10   6   8   8  11    4 |   12  12  16  16  12  12  18   12
  14  |  38  38 --- ---  70  54  47   26 |    4  11 --- ---  14  20   6    7
  15E |  10  16  15  10  21  10  22    6 |   10  16  16  17  18   6  22   10
  16  |  13  11  11   9   8   9  27    6 |   27  28  26  33  30  29  21   27
  17E |  12  14  14  18   9   8  21    6 |   11  19  10  17  15   6  23    9
  18  |   6  25  12   9   8   8  12    5 |   30  41  24  31  27  30  31   28
  19  |  13  14 ---   9   7  11 ---    7 |  142 133 ---  10 142 150 ---  142
  21  |  14  19  16  11   4   6  16    6 |   39  43  32  44  37  39  35   38
  22  |   6   9   6  10   6   9  10    4 |    8  11   8  14   9   8  12    8
  23  |  10  15   9  17   5  11  21    6 |   24  26  24  31  21  21  20   24
  24E |  14  15  10  17  12   7  16    6 |    6  18  10  18  12   5  21    9
  25  |  17  15   8  13  10   7  22    6 |   29  35  40  39  34  41  42   37
  26  |  10  21  10   7   7   8  24    6 |   27  24  35  25  26  30  28   28
  27  |   7  26   7  10   9   9  21    6 |   10  25  11  14  14  11  18    9
  28  |   7   7   8   8   5   7  15    4 |    6   9   7   9   8   9  14    6
  29  |   8  31   7   9   9   9  22    7 |   13  40   8   8  15   7  18    9
  31  |   7  12   8   9  12   8  13    4 |    9   9   9  12   9   7  16    7
------|----------------------------------|----------------------------------
 RMS  |  13  17  10  11  17  13  20      |T  33  35  18  21  38  35  21   33
 WRMS |   9  16   9  11   9  10  20      |NE 36  37  19  21  36  38  21   36

Table 3.0853.6   GPS week: 0853   Day: 6   MJD: 50221.0

               Weighted Average                Orbit Dynamics (7 days)
 PRN  | cod emr esa gfz igp jpl ngs  IGS |  cod emr esa gfz igp jpl ngs  IGS
------|----------------------------------|----------------------------------
   1  |   6   9   6   7   7   8   7    3 |   14  18  12  19  15  14  19   15
   2  |   6  19   7   8  18   6  22    5 |    6  13   6  11  15   5  21    6
   3  |   9  11   6   8   8   7  15    4 |    9  14  10  15  10   9  23   11
   4E |   6  13  10  12   7  10  11    5 |   10  13   8  21  15   6  20   11
   5  |   7   9   8   7   8   9   9    3 |    4  12  10  11  11   7  12    7
   6  |   6  21   8   8  10   7  14    4 |    4  21   5   9   8   6  11    4
   7  |   7   9   4   7  14   7  17    4 |    4   7   7  11  11   5  16    5
   9  |   8  10   9   6   9   9   9    4 |   11  14  17  16  12  14  17   13
  14  |   6  11   6  10   7   7   8    4 |    0   0   0   0   0   0   0  ---
  15E |   7  20  14   9  18   7  10    5 |    7  16  10  16  13   7  18   10
  16  |   7  14  10   8  17   7  10    4 |   13  14  11  10  12  10  15   10
  17E |  12  19  16  17   7  10  26    7 |   10  22  10  22   9   7  17   10
  18  |  10  24   5   5  13   9  12    5 |   23  22  18  19  19  22  20   18
  19  |  21  69 --- ---  33  58 ---   33 |   99 126 --- ---  91  92 ---   96
  21  |   6  11  12   9   4   6   9    4 |   23  18  17  22  18  21  21   20
  22  |   7   8   7  10   6   6   8    4 |    7  12   8  11  10   5  10    7
  23  |   7   7   9  15   8  10  15    5 |   14  17  13  24  17  13  21   16
  24E |   8  22  10  14  18  11  11    5 |    8  20   8  22  18   5  22   12
  25  |  12  11   6   8  11  10   8    4 |   24  28  29  34  27  30  28   29
  26  |   7  10   8   9   3   9   8    4 |   11  20  15  16  16  16  10   14
  27  |   7  29  10  10  35  11  25    7 |   11  24  11  15  19  12  24   11
  28  |   9  12   7   9   9   5  14    4 |    5  12   7   9   7   4  19    5
  29  |   8  14   5   7  11   8  11    4 |   14  17   7   9   8   8  18    7
  31  |   6  16  14   8  10   7  16    5 |    6  11   9  12   9   5  19    8
------|----------------------------------|----------------------------------
 RMS  |   9  21   9  10  14  14  14      |T  23  31  12  17  24  22  18   23
 WRMS |   7  16   8   9  10  15  14      |NE 25  32  12  16  24  24  18   25

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 4.0853   GPS week: 0853   MJD: 50215.0-50221.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2285 |U  53   38   91 |U  45   35   91 |   45   27   67 |
emr | emr 2292 |   42   31   76 |   31   26   77 |U  33   18   48 |
esa | esa 1995 |  316  206  654 |U 305  145  600 |  269  173  487 |
gfz | gfz 1111 |   41   32   87 |U  27   28   79 |   32   17   43 |
igp | igp 2278 |   45   34   81 |   31   29   77 |   34   21   49 |
igs | igs 2304 |   43   31   77 |   33   28   79 |   35   18   50 |
jpl | jpl 2284 |U  40   29   73 |U  28   25   73 |   30   16   45 |

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 5.0853.0   GPS week: 0853   Day: 0   MJD: 50215.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2304 |   62   46   98 |   42   38   92 |   42   28   67 |
emr | emr 2302 |   46   42   75 |   27   30   79 |   28   22   59 |
esa | esa 2031 |   55   51   90 |   57   70  143 |   84   44  105 |
gfz | gfz 1056 |   56   36   95 |   30   30   74 |   22   14   38 |
igp | igp 2293 |   46   42   79 |   32   34   80 |   28   28   54 |
igs | igs 2304 |   46   40   76 |   30   33   81 |   34   20   56 |
jpl | jpl 2276 |   43   37   73 |   27   28   72 |   27   18   55 |

Table 5.0853.1   GPS week: 0853   Day: 1   MJD: 50216.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2303 |   46   40  106 |   43   33   94 |   39   26   61 |
emr | emr 2304 |   38   34   90 |   30   27   89 |   23   17   46 |
esa | esa 1970 |   85   72  144 |   78   76  231 |   71   42  129 |
gfz | gfz 1104 |   34   41   97 |   22   31   98 |   16   18   40 |
igp | igp 2301 |   53   43  109 |   33   30   91 |   24   21   50 |
igs | igs 2304 |   41   36   92 |   32   30   96 |   24   18   49 |
jpl | jpl 2281 |   39   32   80 |   26   25   81 |   19   15   37 |

Table 5.0853.2   GPS week: 0853   Day: 2   MJD: 50217.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2302 |   52   32   77 |   47   28   70 |   38   24   59 |
emr | emr 2287 |   45   23   61 |   31   19   60 |   28   14   39 |
esa | esa 2057 |  526  333  999 |  472  193  851 |  430  261  717 |
gfz | gfz 1152 |   45   24   64 |   26   12   47 |   25   13   34 |
igp | igp 2290 |   41   25   64 |   30   23   63 |   30   17   43 |
igs | igs 2304 |   43   23   59 |   32   18   55 |   28   13   38 |
jpl | jpl 2282 |   34   22   66 |   30   17   55 |   26   13   38 |

Table 5.0853.3   GPS week: 0853   Day: 3   MJD: 50218.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2263 |   56   33   75 |   47   40  111 |   44   28   72 |
emr | emr 2265 |   36   25   64 |   32   35   98 |   35   15   47 |
esa | esa 2076 |  438  305  999 |  420  197  856 |  411  286  729 |
gfz | gfz 1152 |   38   30   69 |   37   45  130 |   24   12   36 |
igp | igp 2283 |   39   28   64 |   32   38   96 |   38   19   53 |
igs | igs 2304 |   39   25   59 |   32   34   99 |   35   17   51 |
jpl | jpl 2284 |   37   24   60 |   32   34  100 |   34   14   45 |

Table 5.0853.4   GPS week: 0853   Day: 4   MJD: 50219.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2263 |   56   42   83 |   38   33   84 |   56   28   70 |
emr | emr 2291 |   41   31   62 |   25   23   59 |   49   23   50 |
esa | esa 1933 |  432  281  952 |  467  227  944 |  337  220  734 |
gfz | gfz 1104 |   39   32   72 |   23   24   51 |   61   27   50 |
igp | igp 2301 |   43   31   63 |   30   23   55 |   49   23   46 |
igs | igs 2304 |   41   30   60 |   24   21   53 |   48   22   48 |
jpl | jpl 2288 |   40   28   61 |   23   19   48 |   47   21   44 |

Table 5.0853.5   GPS week: 0853   Day: 5   MJD: 50220.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2262 |   48   36  109 |   54   34   89 |   44   25   70 |
emr | emr 2300 |   50   28   96 |   31   21   69 |   28   16   52 |
esa | esa 1913 |  161   76  220 |  143   85  267 |  133   64  155 |
gfz | gfz 1104 |   35   26  119 |   19   19   63 |   28   16   51 |
igp | igp 2258 |   51   30   96 |   31   23   75 |   33   18   51 |
igs | igs 2304 |   48   31  106 |   41   26   81 |   38   17   51 |
jpl | jpl 2287 |   48   28   93 |   30   23   72 |   28   16   48 |

Table 5.0853.6   GPS week: 0853   Day: 6   MJD: 50221.0

CENT| CLK EPO  |      BRUS      |      USUD      |      WILL      |
----|----------|----------------|----------------|----------------|
cod | cod 2301 |   45   37   85 |   42   37   93 |   45   26   67 |
emr | emr 2297 |   39   32   77 |   40   25   75 |   28   15   43 |
esa | esa 1983 |   78   45  106 |   76   49  164 |   92   48  157 |
gfz | gfz 1104 |   34   31   76 |   30   24   57 |   24   13   50 |
igp | igp 2218 |   43   35   80 |   32   25   74 |   26   18   46 |
igs | igs 2303 |   41   31   72 |   37   27   75 |   33   19   55 |
jpl | jpl 2287 |   35   31   70 |   30   24   74 |   23   15   43 |

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