[IGSREPORT-0682] Subject

[ESOC]

IGS Electronic Report    Thu Dec 30  1:42:39 PST 1993      Message Number 0682
******************************************************************************

Author: ESOC IGS-team
Subject: Subject: ESA07287.SUM

Subject: ESA07287.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, T.Martin-Mur, J.Feltens, C.Garcia-Martinez

 Description of analysis for period 1993 Dec 19 - Dec 25
                                                        (week 0728)
 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: - In context with IGS mail 414 - Recommendations for Analysis
               Centers - we told in our summary of last week (0727), that we
               are using ITRF92 coordinates in our IGS processing. That's
               not correct: We are using the ITRF91 coordinates, that have
               been published at the Berne IGS workshop March 24-27 1993.

             - Since we had problems with KOKB on days 353, 354 and 355, we
               had excluded it from our IGS processing for these days. As
               can be seen in table 5, on day 353 the orbital overlaps between
               our fitted and extrapolated orbits are bad, especially for
               PRNs #12, #31, #09. However, orbit comparisons of our fitted
               orbits with the results of another analysis centre have shown
               agreement within the level of several decimeters. This is valid
               for days 354 and 355 too.
                    Also our ERPs improved significantly after KOKB had been
               excluded.

 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  GOLD  KOKB  MADR  PAMA  SANT  TROM  YAR1  |f |e |t
 0728___| FAIR  HART  KOSG  MASP  PERT  TAIW  USUD  YELL |i |s |o
    |DAY|  FORT  KIRU  KOUR  MATE  RCM5  TIDB  WETT      |x.|t.|t.
 ---|---|------------------------------------------------|--|--|--
    |353| FFe   FFe   -Fe   Fee   eee   FeF   FeF   Fe   |11|11|22
    |354| FFe   FFe   -Fe   Fee   eee   FeF   FeF   Fe   |11|11|22
    |355| FFe   FFe   -Fe   Fee   eee   FeF   FeF   Fe   |11|11|22
    |356| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |357| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |358| FF-   FFe   FFe   Fee   eee   FeF   Fe-   Fe   |11|10|21
    |359| FF-   FFe   FFe   Fee   eee   FeF   Fe-   Fe   |11|10|21

    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|  353   354   355   356   357   358   359
   \  |
    \ |
  SAT\|
  ----|-------------------------------------------
   02 |   97    73    60    60    47    67    57
   03 |  113    55    64    57    74    80    76
   12 |  352    68    72    73   128    76   172
   13 |  101    58    37    67    44    42    38
   14 |  144    60    61    57    90   114    64
   15 |   62    77    60    76    69    57   135
   16 |  111    57    35    39    33    39    38
   17 |  144    98    88    59    68   116    77
   18 |   80    68    54    35    73    64    78
   19 |   49    59    62    57    92    54    88
   20 |  112    66    76    56    86    83    55
   21 |   50    63    96    54    69    54    46
   22 |  255   136   151    90    94   118    69
   23 |  263   126   121   128   152   128   145
   24 |   89    55    59    70    59    73    84
   25 |  219    99    61    46    58    53    74
   26 |  202    73    86    66    77    53    50
   27 |   64    71    56    61    69    66    55
   28 |   64    49    54    59    48    58    73
   01 |  140    71    37    68    69    45    97
   29 |  145    95    66   120   164    88   122
   31 |  569    59    50    52    89    89    92
   07 |  102    61    61    60    58    62    69
   09 |  545    62   112   100   191    82   120
   05 |   97   111   106    99    95   112    66
   04 |  140   118    74   118    79    82    98

 6. PRODUCTS GENERATED:

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

  ESA0728*.EPH - Precise GPS orbits and clocks, * = day of the week (0-6)
  ESA07287.ERP - Earth rotation results for week 0728 (including DUT1R)
  ESA07287.SUM - This summary file

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