Subject: [IGSREPORT-0671] Subject
From: ESOC IGS-team
Date: Thu, 23 Dec 1993 8:39:24 PST

IGS Electronic Report    Thu Dec 23  8:39:24 PST 1993      Message Number 0671
******************************************************************************

Author: ESOC IGS-team
Subject: Subject: ESA07277.SUM

Subject: ESA07277.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 12 - Dec 18
                                                        (week 0727)
 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: - To be in agreement with IGS mail 414 we are fixing KOSG now
               in our IGS processing instead of estimating it. According to
               IGS mail 417 its is recommended not to fix YELL - so we esti-
               mating it now. This has been changed with the beginning of
               week 0727. As before, we using the ITRF92 coordinates (IGS
               mail 263). See corresponding changes of the status of KOSG
               and YELL in the ground stations table.
                    To verify the influence of this change, we have also
               repeated week 0726 with KOSG = 'F' and YELL = 'e'. The mean
               RMS in position between the orbits thus obtained and the
               original orbits with KOSG = 'e' and YELL = 'F' are in the
               range of 3-5 cm and in one case 10 cm. The differences in
               the ERPs are between 0.01 and 0.08 masec.

             - SV-37/PRN07 has been manoeuvered on day 350. We estimated an
               along track velocity increment of +43.5 mm/sec at 09:14 UTC.

             - Over the  days 346, 347, 348 our Yp-polar motion curve shows
               a deflection from a smooth curve having its maximum on day 347
               with 1.5 masec. We cannot clearly recognize the reason for
               this. However, some stations in the pacific area show higher
               residuals at that days than usual.

             - The ESOC IGS team wishes all of you and your families a

                  M E R R Y   C H R I S T M A S

                                *
                               * *
                             *  o  *
                           *    O    *
                         *     O@O     *
                        *     O@@@O     *
                        *    O@@#@@O    *
                         *    O@#@O    *
                          *     @     *
                                |
                           (IIIIIIIII)
                            IIIIIIIII
                            IIIIIIIII
                            IIIIIIIII
                            IIIIIIIII
                            IIIIIIIII
                     \\\\\\\\\\\|///////////
                      \\\\\\\\\\|//////////
                   ---------------------------

and a         H A P P Y   N E W   Y E A R   1 9 9 4

 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
 0727___| FAIR  HART  KOSG  MASP  PERT  TAIW  USUD  YELL |i |s |o
    |DAY|  FORT  KIRU  KOUR  MATE  RCM5  TIDB  WETT      |x.|t.|t.
 ---|---|------------------------------------------------|--|--|--
    |346| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |347| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |348| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |349| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |350| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |351| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23
    |352| FFe   FFe   FFe   Fee   eee   FeF   FeF   Fe   |12|11|23

    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|  346   347   348   349   350   351   352
   \  |
    \ |
  SAT\|
  ----|-------------------------------------------
   02 |   55    48    62    48    52    68    55
   03 |   91    42    66    73    38    61   141
   12 |   60    64    85    61    84   102   185
   13 |   73    64    44    51    51    61    85
   14 |   29    89   124    33    49    51   171
   15 |   75   119   159    52    47    64   125
   16 |   54    58    46    25    49    98    58
   17 |   63    43    39    67    60    57    98
   18 |   39    46    52    46    66    62    73
   19 |   65    75    76    69    63    67   116
   20 |   93   113    78    75    70    54    53
   21 |   29    53    81    80    42    81   100
   22 |   72    49   190    82   122    76   121
   23 |   71    45    27    82    85    83   194
   24 |   63    92    52    61    60    77    87
   25 |   84    93    96    60    50    61    79
   26 |   36    35    27    22    21    62   111
   27 |   66    83    54   101    88    80   117
   28 |   57   115   152    56    78    95   108
   01 |   74    44   100    48    68    59    70
   29 |   74    39    51    39    61    83   170
   31 |  123    60    98   105   147    88   284
   07 |   84    63    80    58 ----- -----   120
   09 |  106    69   120    77   106    49   242
   05 |   68    38   200    56    75    68    90
   04 |   78    81   153    78    88   107   142

 6. PRODUCTS GENERATED:

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

  ESA0727*.EPH - Precise GPS orbits and clocks, * = day of the week (0-6)
  ESA07277.ERP - Earth rotation results for week 0727 (including DUT1R)
  ESA07277.SUM - This summary file

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