Subject: [IGSMAIL-93] ESA/ESOC analysis report
From: Joachim Feltens
Date: 13 SEP 1992 17:21:37

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IGS Electronic Mail       13-SEP-1992 17:21:37       Message Number 93
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==============================================================================
                   THIS FILE CONTAINS 3 MESSAGES
==============================================================================

From:    Joachim Feltens
Subject: ESA/ESOC analysis report
         ------------------------

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

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

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

Description of analysis for period 1992 August 30 to September 05
                                                     (days 243-249,GPS week 660)
1. SOFTWARE USED:   GPSOBS/BAHN5

2. MODELS AND CONSTANTS USED

   a) General:                 no changes with respect to previous runs

   b) Satellite Force Model:   no changes with respect to previous runs

      The following table gives an overview over the satellites that have been
      used for the different one-day-arc solutions:     "+" used, "-" not used.
      __________________________________________________________________________
      PRN02| 03| 11| 12| 13| 14| 15| 16| 17| 18| 19| 20| 21| 23| 24| 25| 26| 28|
      ____-|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
      DAY| |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
      243|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      244|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      245|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      246|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      247|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      248|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      249|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |

   c) Ground Stations (if being estimated, one position (X,Y,Z) every day):

      The following table gives an overview over the ground stations,  that have
      been included into the GPS-data processing at ESOC. Except where otherwise
      noted ("remarks"), corrections are taken from IGS Mail No. 65  -  IGS site
      information and coordinates,updated version of IERS/IGS Tables in IGS Mail
      No. 33  -  (Boucher and Altamimi). From day 247 on,the updated corrections
      were taken from IGS Mail No. 90 (Boucher and Altamimi).
      __________________________________________________________________________
                          |             |    |    GPS WEEK 660     |
                          |             |    | 2  2  2  2  2  2  2 |
                          |             |    | 4  4  4  4  4  4  4 |
              SITE        |   COUNTRY   |CODE| 3  4  5  6  7  8  9 |  REMARKS
      --------------------|-------------|----|---------------------|------------
        Algonquin         | Canada      |ALGO| F  F  F  F  F  F  F |
        CANB/Tidbinbilla  | Australia   |TIDB| e  e  e  e  e  e  e |
        Penticton         | Canada      |DRAO| F  F  F  F  F  F  F |
        Fairbanks         | U.S.A/Alaska|FAIR| F  F  F  F  F  F  F |
        Goldstone         | U.S.A.      |GOLD| F  F  F  F  F  F  F |
        Hartebeesthoek    | South Africa|HART| F  F  F  F  F  F  F |
        Herstmonceux      | U.K.        |HERS| F  F  F  F  F  F  F |
        Kokee Park        | U.S.A/Hawaii|KOKB| e  e  e  e  e  e  e |
        Kourou      (ESA) | French Guyan|KOUR| ------------------- | own estim.
        Madrid            | Spain       |MADR| F  F  F  F  F  F  F |
        Maspalomas  (ESA) | Spain/Can.Is|MASP| e  e  e  e  e  e  e |
        Matera            | Italy       |MATE| F  F  F  F --- F  F |
        McMurdo           | Antarctica  |MCMU| e  e  e  e  e  e -- |
        Metsahovi         | Finland     |METS| -- F  F  F  F  F  F |
        Ny Alesund/Spitzb.| Norway      |NYAL| e  e  e  e  e  e  e |
        Onsala            | Sweden      |ONSA| e  e  e  e  e  e  e |
        Pamate/Tahiti     | France      |PAMA| e  e  e  e  e  e  e |
        Santiago          | Chile       |SANT| F  F  F  F  F  F  F |
        Tai-Shi           | Taiwan      |TAIW| e  e  e  e  e  e  e |
        Usuda             | Japan       |USUD| e ------------ e  e |
        Wettzell          | Germany     |WETT| F ------ F  F  F  F |
        Yaragadee         | Australia   |YAR1| F  F  F  F  F  F  F |
        Yellowknife       | Canada      |YELL| F  F --- F  F  F  F |

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

   d) Earth Rotation Parameters:   no changes with respect to previous runs

   e) Observations:                no changes with respect to previous runs

3. PARAMETERS TO BE ESTIMATED PER 1-DAY ARC

   a) Satellite Parameters per Spacecraft:    no changes with respect to
                                                                   previous runs
   b) Station related parameters per ground station:  no changes with respect to
                                                                   previous runs
   c) Earth Rotation Parameters:              no changes with respect to
                                                                   previous runs
4. PARAMETERS TO BE KEPT FIXED IN THE SOLUTION

   a) Satellite Parameters per Spacecraft:    no changes with respect to
                                                                   previous runs
   b) Station related parameters per Ground Station:  no changes with respect to
                                                                   previous runs
5. PRODUCTS GENERATED

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

   ESA06600.EPH   - Precise GPS orbits for day 243 (August    30)
   ESA06601.EPH   - Precise GPS orbits for day 244 (August    31)
   ESA06602.EPH   - Precise GPS orbits for day 245 (September 01)
   ESA06603.EPH   - Precise GPS orbits for day 246 (September 02)
   ESA06604.EPH   - Precise GPS orbits for day 247 (September 03)
   ESA06605.EPH   - Precise GPS orbits for day 248 (September 04)
   ESA06606.EPH   - Precise GPS orbits for day 249 (September 05)
   ESA06607.ERP   - Earth rotation results for week beginning 1992 August 30
   ESA06607.SUM   - The name of this text file

==============================================================================

From:    Ch. Reigber
Subject: GFZ analysis report
         -------------------

Report for GPS Week 657 (Days 222-228) from GFZ
===============================================

This report is generated by the GeoForschungsZentrum Potsdam (GFZ) 
on a weekly basis for the International GPS Geodynamics Service (IGS). 

PRODUCT SUMMARY 

   GFZ0657*.EPH:  GPS ephemerides for GPS Week 657 (SP3 format, pos. and vel.)
                  * represents: 0 for Sunday, .... , 6 for Saturday
   GFZ06577.ERP:  Earth rotation parameter (UT1 corrections are not included)
   GFZ06577.CLK:  ST and SV clock parameters of each observation epoch (the
                  maser-based clock at Fairbanks is taken as reference clock)
   GFZ06577.SUM:  Summary file for reporting week 

The above specified products are available at CDDIS. The ERP results are 
submitted additional to IERS Central Bureau and IERS Sub Bureau for Rapid
Service and Predictions.

*********************************************************************************
Note: Due to AS for the days 222, 223 and 228 our orbit files do not include
      the satellites 2, 16, 17, 20, 21, 23, 24, 25, 26, 28
*********************************************************************************

CORE STATION SUMMARY

The Core Station data used in the solutions is given below.  

                                      Day of Week 657
                                    S  M  T  W  T  F  S
                                    U  O  U  E  H  R  A
        Site                        N  N  E  D  U  I  T
Name            Code      
---------------------------------------------------------
Algonquin       ALGO                X  X  X  X  X  X  X
Fairbanks       FAIR                X  X  X  X  X  X  X
Goldstone       DS10                -  X  X  X  X  X  X
Hartebeesthoek  HART                X  X  X  X  X  X  X
Kokee Park      KOKR                X  X  X  X  X  X  X
Mc Murdo        MCMU                X  X  X  X  X  X  X
Ny-Alesund      NALL                X  X  X  X  X  X  X
Pamatai         PAMA                X  X  X  -  X  X  X
Santiago        SANT                X  X  X  X  X  -  X
Tai Shi         TAIW                -  -  X  X  X  -  -	
Tidbinbilla     TIDB                X  X  X  X  X  X  X
Tromsoe         TROM                X  X  X  X  X  X  X 
Usuda           USUD                -  X  X  X  X  X  X
Wettzell        WTZ1                X  X  X  X  X  X  X
Yellowknife     YELL                X  X  X  X  X  X  X
Yarragadee      YAR1                X  X  X  X  X  X  X
---------------------------------------------------------

SOLUTION CHARACTERISTICS

1. Analysis Center: GFZ/DLR
2. Analysing Team: D. Angermann, R. Galas, Ch. Reigber,
                   W. Sommerfeld, S.Y. Zhu 
3. Solution Identifier: EPH(GFZ)92G01-DDD
                        ERP(GFZ)92G02-DDD
                        CLK(GFZ)92G01-DDD (only relative)
4. Software used: GEPARD4.0
5. Defintion of Terrestrial Reference Frame
   Origin: Nominally ITRF-90
   Orientation: Nominally ITRF-90
   Reference Epoch: 1992.352 (MJD 48750)
   Fixed set of stations: Y. Bock Solution (IGS Message No.56)
   ALGO, YELL, FAIR, KOKR, TROM, WTZ1, YAR1, USUD, NALL, PAMA,
   MCMU, TAIW, DS10, SANT, HART
6. Data used:
   - undifferenced pseudo ranges and carrier phases
   - 1-day arc solutions 
7. Adjusted parameters:
   - State vector of all GPS satellites
   - Daily polar motion
   - Coordinate corrections for non-fixed stations
   - Troposheric zenith path delay 
   - Solar radiation scale and y-bias 
   - Ambiguities
   - ST and SV clock parameters of each observation epoch (the 
     maser-based clock at Fairbanks is taken as reference clock)

SOLUTION STATISTICS

                         Arc No.      0     1     2     3     4     5     6    
   ------------------------------------------------------------------------
   Observation Interval [sec]       120   120   360   360   360   360   120
   Number of observations         15673 17952 25077 24340 25839 21023 21187 
   RMS of carrier phases [cm]       0.3   0.3   0.7   0.8   0.9   0.7   0.4
   RMS of code measurements [cm]   39.7  40.7  47.4  40.2  40.4  38.3  43.2
   ------------------------------------------------------------------------

-  GFZ06577.ERP
   ============

   Solution identifier for ERP-Results:
   * GPS week 650-653:   ERP(GFZ)92G01-DDD 
   * since GPS week 654: ERP(GFZ)92G02-DDD
   Please notice, that these two solutions are related to
   different reference frames.
    
   MJD      x    sigmax    y    sigmay

 48843.5 -.0707 0.0012 0.4658 0.0015
 48844.5 -.0700 0.0010 0.4702 0.0014
 48845.5 -.0687 0.0003 0.4728 0.0003
 48846.5 -.0657 0.0004 0.4746 0.0005
 48847.5 -.0640 0.0004 0.4766 0.0005
 48848.5 -.0622 0.0006 0.4778 0.0006
 48849.5 -.0590 0.0008 0.4806 0.0012

-  GFZ06577.CLK
   ============
   
   The clock parameter file is avaibable at CDDIS.
   The format of this file is described in the
   IGS Message No. 55.

==============================================================================

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
          -----------------------------------------

Date:     11 September 1992

An updated look at Earth orientation data submitted to the IERS
follows.  Units are milliseconds of arc for x and y, and
milliseconds of time for UT1-UTC.

Contributor Data Span Points       Mean          Standard Deviation
                                (NEOS-GPS)  
                              x     y   UT1-UTC   x     y   UT1-UTC
U. of Texas  48794.5    53  -0.79 -2.79          1.33  1.83  
             -48848.5

Scripps      48780.5    82  -1.12 -1.59          0.67  0.50
             -48862.5     

U. of Berne  48792.5     8  -0.38  0.19  -1.50   1.64  1.72  0.14 
 (ITRF90)    -48799.5

U. of Berne  48800.5    64  -0.50  0.29  -0.17   0.76  0.90  0.27 
(ITRF91)    -48863.5

JPL          48794.5    62  -1.27 -0.07          0.62  0.92 
             -48863.5

GFZ          48795.0    55  -2.41  -1.80         1.28  1.36
             -48849.5

ESOC         48763.5    72  -1.64  0.69          1.41  2.20
             -48870.5

Plots are available by FAX to anyone interested.

Regards,

Dennis McCarthy
  [email-masked]