Subject: [IGSREPORT-441] ESA07087.SUM
From: J. Feltens
Date: 18 AUG 1993 14:44:37

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IGS Electronic Report     18-AUG-1993 14:44:37       Message Number 441
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From: J. Feltens 
Subj: ESA07087.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.Martin-Mur, C.Garcia-Martinez

 Description of analysis for period 1993 Aug 01 - Aug 07
                                                        (week 0708)
 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

 3. REMARKS: SV-15/PRN15 has been manoeuvred on day 214 (2 Aug). We have esti-
             mated an along track delta-v of +125 mm/sec at epoch 17:03:30 UTC
             on 2 Aug.  The manoeuvre  also explains  the bad orbit comparison
             results in  Table 5 for  SV-15/PRN15  for days  214, 215 and 216,
             since  the manoeuvre caused  large deviations between  the orbits
             being predicted from previous day and the corresponding estimated
             orbits including the manoeuvre. Since we work with overlaps,  the
             manoeuvre had to be estimated on day 215 too,  which also  influ-
             ences the orbit comparison on day 216.

 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  RCM2  TROM  YAR1  |f |e |t
 0708___| FAIR  KIRU  MADR  MCMU  SANT  USUD  YELL |i |s |o
    |DAY|  GOLD  KOKB  MASP  PAMA  TIDB  WETT      |x.|t.|t.
 ---|---|------------------------------------------|--|--|--
    |213| FFF   FeF   eFe   -e-   eFF   FeF   FF   |12| 6|18
    |214| FFF   FeF   eFe   -e-   eFF   FeF   FF   |12| 6|18
    |215| FFF   FeF   eFe   eee   eFF   F-F   FF   |12| 7|19
    |216| FFF   FeF   eFe   ee-   eFF   F-F   FF   |12| 6|18
    |217| FFF   FeF   eFe   ee-   eFF   F-F   FF   |12| 6|18
    |218| FFF   FeF   eFe   ee-   eFF   FeF   FF   |12| 7|19
    |219| FFF   FeF   -Fe   ee-   eFF   FeF   FF   |12| 6|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 <METER>

  \DAY|  213   214   215   216   217   218   219
   \  |
    \ |
  SAT\|
  ----|-------------------------------------------
   01 |  1.3   2.0   1.3   1.0   1.7   2.5   1.6
   02 |  1.1   2.9   1.5   0.7   1.3   1.0   1.1
   03 |  0.9   0.3   0.8   1.1   0.4   0.5   0.6
   12 |  0.8   0.6   0.7   0.9   0.8   1.0   0.4
   13 |  0.9   0.5   1.7   1.2   0.8   0.7   0.6
   14 |  0.6   2.1   0.7   1.9   2.1   1.7   1.7
   15 |  1.8   ---  38.2  18.2   0.9   1.8   1.6
   16 |  1.6   1.6   2.2   1.3   1.1   2.0   1.1
   17 |  2.5   3.0   2.4   1.4   1.4   2.0   1.4
   18 |  0.8   1.1   0.7   1.1   1.4   0.8   0.9
   19 |  1.3   0.6   1.0   1.3   1.1   0.5   0.9
   20 |  2.6   1.8   3.2   4.0   2.3   3.6   2.9
   21 |  3.2   0.7   1.7   1.0   1.0   2.5   1.2
   22 |  1.0   1.0   1.8   1.7   1.3   2.3   1.2
   23 |  2.0   1.3   0.9   0.8   0.8   1.6   1.6
   24 |  2.0   1.3   2.8   1.7   1.2   0.6   0.9
   25 |  1.1   2.0   1.1   2.0   2.2   0.7   2.2
   26 |  2.5   2.0   2.4   1.1   1.4   2.6   3.4
   27 |  1.0   1.3   0.7   1.7   1.1   0.6   0.8
   28 |  0.6   0.7   1.1   2.3   1.0   1.6   1.7
   29 |  1.3   0.6   0.8   1.2   1.7   0.5   0.8
   31 |  1.0   0.9   1.0   1.7   0.8   1.9   1.7
   07 |  1.1   1.7   3.2   1.0   1.3   1.4   1.3
   09 |  1.1   0.7   0.8   1.2   0.9   0.8   0.5

 6. PRODUCTS GENERATED:

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

  ESA0708*.EPH - Precise GPS orbits, *=0 for Sunday,..., 6 for Saturday
  ESA07087.ERP - Earth rotation results for week 0708 (including DUT1)
  ESA07087.SUM - This summary file

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