Subject: [IGSREPORT-604] ESA07217.SUM
From: C.GARCIA
Date: 20 NOV 1993 12:45:09

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IGS Electronic Report     20-NOV-1993 12:45:09       Message Number 604
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From: C.GARCIA
Subj: ESA07217.SUM
------------------

 -------------------------
 ANALYSIS CENTRE: ESA/ESOC
 -------------------------

 OUTLINE OF THE ESTIMATION OF GPS-ORBITS AND EARTH ROTATION PARAMETERS
 AT THE ESOC PROCESSING CENTRE FOR IGS

 J.M.Dow, J.Feltens, T.J.Martin-Mur, C.Garcia-Martinez

 Description of analysis for period 1993 Oct 31 - Nov 06
                                                        (week 0721)
 1. SOFTWARE USED:   GPSOBS/BAHN-Version 5

 2. MODELS USED AND PARAMETERS ESTIMATED/FIXED:

  For a description of models and parameters used ==> see IGS - Mail  51
  For updates of the models and parameters used   ==> see IGS - Mail 114 and
                                                      see IGS - Rep. 224,277

  From this week on we have started to estimate d(UT1R-TAI)/dt, instead of
  d(UT1-TAI)/dt.

  From this week we will include more observations and passes in our
  processing.

  From this week we will be able to exclude the observations to
  manoeuvring satellites from affecting the geodetic parameters
  (eop's, station coordinates) and the estimated orbit of other
  satellites. Observations to manoeuvring satellites will only
  be used to estimate their own parameters (state vector, biases,
  manoeuvres)

 3. REMARKS: - Satellite SV-31/PRN31 was repositioned on day 31/10/93
               at about 19:51:30. We have estimated the following
               components in the orbital reference frame:

                  Radial     :    5 mm/s
                  Transverse : -147 mm/s
                  Normal     :   -2 mm/s

               Observations to this satellite were excluded from the
               geodetic parameter estimation on days 304 and 305.

             - Satellite SV-29/PRN29 was repositioned on day 04/11/93
               at about 01:33:00. We have estimated the following
               components in the orbital reference frame:

                  Radial     :    3 mm/s
                  Transverse :  112 mm/s
                  Normal     :    2 mm/s

               Observations to this satellite were excluded from the
               geodetic parameter estimation on days 307, 308 and 309.

             - AS on days 307, 308, 309, 310.

             - Satellite SV-09/PRN13 was scheduled to be unusable on
               day 308 beginning 0000 UTC until day 349 at 0000 due
               to maintenance. L-BAND will be cycling on and off during
               the outage. The orbit of this satellite is affected on
               days 309 and 310 by the lack of measurements.

 4. GROUND STATIONS: Boucher and Altamimi, IGS workshop Berne 24-27 March'93
                     IGS/IERS station coordinates in the ITRF91 at 1992.6
 ___________________________________________________________
 GPSweek|ALGO  HART  KOUR  MATE  SANT  USUD  YELL  |f |e |t
 0721___| FAIR  KIRU  MADR  MCMU  TIDB  WETT       |i |s |o
    |DAY|  GOLD  KOKB  MASP  PERT  TROM  YAR1      |x.|t.|t.
 ---|---|------------------------------------------|--|--|--
    |304| FFF   FeF   eFe   eee   FFF   eFF   F    |12| 7|19
    |305| FFF   FeF   eFe   eee   FFF   eFF   F    |12| 7|19
    |306| FFF   FeF   eFe   eee   FFF   eFF   F    |12| 7|19
    |307| FFF   FeF   eFe   eee   FFF   eFF   F    |12| 7|19
    |308| FFF   FeF   eFe   eee   FFF   eFF   F    |12| 7|19
    |309| FFF   FeF   eFe   eee   FFF   e-F   F    |11| 7|18
    |310| FFF   FeF   eFe   eee   FFF   e-F   F    |11| 7|18

    with: "F" ... coordinates of ground station kept fixed,
          "e" ... coordinates of ground station estimated,
          "-" ... ground station not included on that day.

 5. ORBIT FIT MINUS EXTRAPOLATION FROM PREVIOUS DAY, RMS IN <CENTIMETER>

  \DAY|  304   305   306   307   308   309   310
   \  |
    \ |
  SAT\|
  ----|-------------------------------------------
   02 |   74    44    92    44    71    76    47
   03 |   40    19    47    36    39    37    38
   12 |   29    33    46    38    44    28    35
   13 |   52    70    35    79    47    56   152
   14 |   27    48    37    31    71    46    60
   15 |   31    22    51    37    42    35    31
   16 |   72    26    33    80    45    79   106
   17 |   38    29    35    32    62    28    21
   18 |   92    50    70    46    42    74    55
   19 |   41    58    50    53    66    58    35
   20 |   63    63    52    77    72    51    39
   21 |   53    86    55    30    60    59    32
   22 |   49    51    61    72    53    40    55
   23 |   43    23    76    25    25    80    25
   24 |   70    40    41    56    70    21    36
   25 |   40    67    60    23   123    63    48
   26 |   47    55    60    36    50   101    61
   27 |   42    77    91    90    81    70    89
   28 |   99   169    86   144   106    68    81
   01 |   57   110   119   113    94    62    68
   29 |   53    58    70    68   198   168    58
   31 |   --   278   100   107   155    62   146
   07 |  139    91   220   241   174    83    77
   09 |   79    50    63    50    96    52    59
   05 |   41    46    43    39    57    35    53

 6. PRODUCTS GENERATED:

  The following products are generated and stored in CDDIS at NASA/GSFC:

  ESA0721*.EPH - Precise GPS orbits, *=0 for Sunday,..., 6 for Saturday
  ESA07217.ERP - Earth rotation results for week 0721 (including DUT1R)
  ESA07217.SUM - This summary file

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