Subject: [IGSREPORT-272] ESA Analysis Report (week 693)
From: Joachim Feltens
Date: 15 MAY 1993 15:17:24

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IGS Electronic Report     15-MAY-1993 15:17:24       Message Number 272
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From: Joachim Feltens
Subj: ESA Analysis Report (week 693)
------------------------------------

 -------------------------
 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 April 18 - April 24
                                                            (week 0693)
 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
 3. REMARKS: With  the beginning  of  week 0693 we  have included SV-31/PRN31
             into our IGS-processing.
                  A manoeuvre was  announced  in  CANSPACE  at 9 April 93 for
             SV-32/PRN01. We dectected the  manoeuvre on 22 April 93 at 11:28
             UTC and  estimated a  velocity increment value of -138.0 mm/sec.
                  A/S was  switched on  from day 109 (19 Apr 93) 00:00 UTC to
             day 114 (24 Apr 93) 00:00 UTC. To handle the A/S data,the thres-
             hold separating data noise from cycle slips, had to be enlarged.
             Obviously A/S deteriorated  our results, as can be seen from the
             orbit table attached,and our ERP values seem to be less accurate
             compared with non-A/S weeks  too.  The RMS values  obtained from
             processing were larger than usual.

 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  MADR  MCMU  SANT  USUD  YELL  |f |e |t
 0693___| FAIR  KOKB  MASP  PAMA  TIDB  WETT       |i |s |o
    |DAY|  GOLD  KOUR  MATE  RCM2  TROM  YAR1      |x.|t.|t.
 ---|---|------------------------------------------|--|--|--
    |108| FFF   FFe   Fee   e-e   FFF   eFF   F    |12| 6|18
    |109| FFF   FFe   Fee   e-e   FFF   eFF   F    |12| 6|18
    |110| FFF   FFe   Fee   e-e   FFF   eFF   F    |12| 6|18
    |111| FFF   FFe   Fee   e-e   FFF   -FF   F    |12| 5|17
    |112| FFF   FFe   Fee   eee   FFF   eFF   F    |12| 7|19
    |113| FFF   FFe   Fee   eee   FFF   eFF   F    |12| 7|19
    |114| FFF   FFe   Fee   eee   FFF   eFF   F    |12| 7|19

    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|  108   109   110   111   112   113   114
   \  |
    \ |
  SAT\|
  ----|-------------------------------------------
   01 |  1.9   5.5  20.4   2.2 136.6  93.1   1.4
   02 |  2.0   2.1   1.3   0.9   0.8   3.7   1.6
   03 |  1.3   2.1   0.9   1.2   1.2   4.2   1.5
   11 |  3.6   1.1   1.0   0.7   2.1   3.8   1.2
   12 |  0.5   2.2   0.7   0.7   1.3   1.4   2.2
   13 |  0.5   1.5   4.0   1.4   0.7   1.7   0.9
   14 |  0.6   2.4   0.7   2.2   4.1   4.4   1.1
   15 |  0.6   2.0   1.5   3.9   2.7   2.7   1.3
   16 |  0.7   4.7   3.2   0.6   0.8   2.7   0.9
   17 |  1.6   0.8   1.1   1.4   1.8   2.2   2.1
   18 |  1.6   1.1   1.1   1.0   2.5   5.6   2.1
   19 |  1.3   2.0   2.1   1.2   3.8   1.4   1.5
   20 |  1.2   1.3   2.0   1.4   2.7   2.0   2.0
   21 |  0.5   1.3   0.7   1.3   1.1   2.1   1.1
   22 |  8.1   1.6   1.2   0.8   1.4   2.5   3.5
   23 |  1.4   1.2   1.0   2.8   3.2   2.2   1.0
   24 |  0.4   1.4   0.8   2.7   2.1   1.8   1.4
   25 |  3.7   2.6  20.2   1.8   5.0   2.6   9.2
   26 |  2.6   3.9   1.5   1.3   1.7   2.5   1.4
   27 |  1.8   3.0   1.0   3.0   1.3   2.5   1.8
   28 |  2.4   1.1   2.8   2.7   1.9   3.6   2.8
   29 |  7.5   1.4   2.5   4.2   2.5   2.3   8.1
   31 |  ---   5.3   2.5   1.4   2.0   2.8   1.8

 6. PRODUCTS GENERATED:

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

  ESA0693*.EPH - Precise GPS orbits, *=0 for Sunday,..., 6 for Saturday
  ESA06937.ERP - Earth rotation results for week 0693 (including DUT1R)
  ESA06937.SUM - This summary file

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