Subject: [IGSMAIL-51] ESOC analysis description
From: J. Feltens
Date: 23 JUL 1992 09:01:21

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IGS Electronic Mail       24-JUL-1992 11:02:04       Message Number 51
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                   THIS FILE CONTAINS 3 MESSAGES
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From:    J. Feltens (ESOC)
Subject: ESOC analysis description
         -------------------------

-------------------------
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 June 21-27 (days 173-179, GPS week 650)

1. SOFTWARE USED:   GPSOBS/BAHN5

2. MODELS AND CONSTANTS USED

   a) General:

      - Velocity of Light:              c  = 299792.458  <km/s>
      - Earth Gravitational Constant:   GM = 398600.4415 <km*3/s**2>
      - Mean Equatorial Earth Radius:   Ae =   6378.137  <km>
      - Solid Earth Tidal Love no.:     h  =      0.6090
      - Solid Earth Tidal Shida no.:    l  =      0.0852

   b) Satellite Force Model:

      - Geopotential, GEM-T3 (n = 8, m = 8
                              plus C21 = -0.17e-09 and S21 = 1.19e-09)
      - Solar Third Body Attraction
      - Lunar Third Body Attraction
      - Solid Tides, k2 = 0.300, phi = 0, Wahr frequency dependent corrections
      - Ocean Tides , Schwiderski; n = 6, m = 2, 11 tidal constituents
      - Non-Gravitational:
          Solar Pressure + Thermal Emission: Fliegel et al. (1992),
                                     models T10 for BLOCK I and T20 for BLOCK II
          Y-bias acceleration

      The tracking data of all 17 GPS satellites available at the moment are
      used.

   c) Ground Stations:

      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. 33  -  IGS site
      information and coordinates  -  (Boucher and Altamimi).
      __________________________________________________________________________
                          |             |    |    GPS WEEK 650     |
                          |             |    | 1  1  1  1  1  1  1 |
                          |             |    | 7  7  7  7  7  7  7 |
              SITE        |   COUNTRY   |CODE| 3  4  5  6  7  8  9 |  REMARKS
      --------------------|-------------|----|---------------------|------------
        Algonquin         | Canada      |ALGO| F  F  F  F  F  F  F |
        Canberra          | Australia   |CANB| E  E  E ------ E  E | Bern
        Penticton         | U.S.A.      |DRAO| -------- E  E  E  E |
        Fairbanks         | U.S.A/Alaska|FAIR| F  F  F  F  F  F  F |
        Goldstone         | U.S.A.      |GOLD| F  F  F --- E  E  E |
        Herstmonceux      | U.K.        |HERS| ----------- F ----- |
        Kokee Park        | U.S.A/Hawaii|KOKB| E  E  E  E -------- |
        Kourou      (ESA) | French Guyan|KOUR| ------------------- |
        Madrid            | Spain       |MADR| F  F  F  F  F  F  F |
        Maspalomas  (ESA) | Spain/Can.Is|MASP| -- E  E  E  E  E  E |
        Matera            | Italy       |MATE| -------- E -------- |
        McMurdo           | Antarctica  |MCMU| -------- E  E  E  E | IGS Mail 44
        Metsahovi         | Finland     |METS| ------------------- |
        Ny Alesund/Spitzb.| Norway      |NALL| -------- E  E ----- |
        Onsala            | Norway      |ONSA| ------------------- |
        Pamate/Tahiti     | France      |PAMA| -------- E  E  E  E | IGS Mail 44
        Santiago          | Chile       |SANT| E  E  E ----------- | IGS Mail 35
        Tai-Shi           | Taiwan      |TAIW| -------- E -------- | Bern
        Tromsoe           | Norway      |TROM| F  F  F ----------- |
        Usuda             | Japan       |USUD| E  E  E  E  E  E  E |
        Wettzell          | Germany     |WETB| ------------------- |
        Yaragadee         | Australia   |YAR1| F  F  F  F  F  F  F |
        Yellowknife       | Canada      |YELL| -------- 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.

      These coordinates are referred to ITRF91 at epoch 1992.5 (IGS Mail No. 33)

      - Atmospheric modelling is done according to the Willmann-Model

      - Ground Station Receiver Clock Biases are ignored in the evaluations

   d) Earth Rotation Parameters:   IERS Bulletin A, UT1 held fixed

   e) Observations:

      Double differenced carrier phases, ionosphere-free combination.
      Elevation cutoff set to 10 degrees, evaluation of the data on day-by-day
      basis.

3. PARAMETERS TO BE ESTIMATED PER 1-DAY ARC

   a) Satellite Parameters per Spacecraft:
                                 . . .
      - one orbital state X,Y,Z, X,Y,Z at start epoch
      - one scaling factor for solar pressure T10 or T20 model
      - one Y-bias acceleration
      - one satellite clock drift parameter

   b) Station related parameters per ground station:

      - ground station position (if marked with an "E" in the table)
      - every 3 hours an atmospheric zenith delay parameter  (Willmann Model)
      - DD-phase ambiguities as real-valued parameters (at least one for each
        observable double difference combination,  additional parameters  for
        cycle slips)

   c) Earth Rotation Parameters:

      - one pair of pole coordinates xp and yp per day

4. PARAMETERS TO BE KEPT FIXED IN THE SOLUTION

   a) Satellite Parameters per Spacecraft:

      - solar pressure scaling factor GX and GZ in spacecraft body fixed x- and
        z-axis are kept fixed with value 1.0

   b) Station related parameters per Ground Station:

      - ground station position (if marked with an "F" in the table)

5. PRODUCTS GENERATED

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

   ESA0650*.EPH   - Precise GPS orbits for week 650 in NGS-format
   ESA0650*.ERP   - Earth rotation results for week beginning 1992 June 21
   ESA0650*.SUM   - The name of this text file

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

From:     Bob E. Schutz
Subject:  UTX/CSR GPS solutions
          ---------------------

      Earth  Orientation Results Submitted to IERS

EARTH ROTATION PARAMETERS
ANALYSIS CENTER:  UNIVERSITY OF TEXAS CENTER FOR SPACE RESEARCH
DATA:  GPS
SOLUTION IDENTIFIER:  EOP(CSR) 92 P 01
SUBMISSION DATE:  23 JULY 1992

   MJD         x        y    UT1        sx       sy     sUT1     RMS   cxy   cxUT1 cyUT1     Sta  Sat Passes

 48794.5 -0.15206  0.35361  0.0       0.00034  0.00038  0.0      2.1   0.0    0.0    0.0      16  17   275
 48795.5 -0.15130  0.35812  0.0       0.00032  0.00035  0.0      2.1   0.0    0.0    0.0      16  17   275
 48796.5 -0.14994  0.36261  0.0       0.00020  0.00024  0.0      1.7   0.0    0.0    0.0      17  17   308
 48797.5 -0.14854  0.36192  0.0       0.00028  0.00041  0.0      1.9   0.0    0.0    0.0      17  17   249
 48798.5 -0.14854  0.36618  0.0       0.00038  0.00046  0.0      1.4   0.0    0.0    0.0      15  17   247
 48799.5 -0.14708  0.36858  0.0       0.00034  0.00034  0.0      1.7   0.0    0.0    0.0      17  17   282
 48800.5 -0.14507  0.37326  0.0       0.00031  0.00033  0.0      1.4   0.0    0.0    0.0      14  17   286
 48801.5 -0.14509  0.37373  0.0       0.00031  0.00030  0.0      1.4   0.0    0.0    0.0      19  17   350
 48802.5 -0.14465  0.37779  0.0       0.00024  0.00026  0.0      1.5   0.0    0.0    0.0      19  17   371
 48803.5 -0.14158  0.38167  0.0       0.00017  0.00017  0.0      1.9   0.0    0.0    0.0      19  17   398
 48804.5 -0.14168  0.38466  0.0       0.00016  0.00017  0.0      1.9   0.0    0.0    0.0      19  17   382
 48805.5 -0.14409  0.38765  0.0       0.00016  0.00017  0.0      2.1   0.0    0.0    0.0      20  17   392  
 48806.5 -0.13850  0.38859  0.0       0.00018  0.00020  0.0      2.2   0.0    0.0    0.0      19  17   392
 48807.5 -0.13689  0.39129  0.000000  0.00022  0.00028  0.000000 1.77  0.031  0.000  0.000    18  16   302
 48808.5 -0.13579  0.39443  0.000000  0.00019  0.00027  0.000000 1.53 -0.090  0.000  0.000    20  16   331
 48809.5 -0.13384  0.39514  0.000000  0.00017  0.00017  0.000000 1.73  0.016  0.000  0.000    20  16   383
 48810.5 -0.13257  0.39760  0.000000  0.00021  0.00022  0.000000 1.75  0.069  0.000  0.000    20  16   339
 48811.5 -0.13019  0.39898  0.000000  0.00015  0.00014  0.000000 1.92  0.102  0.000  0.000    20  17   412
 48812.5 -0.12932  0.40095  0.000000  0.00015  0.00016  0.000000 1.95  0.074  0.000  0.000    20  17   428
 48813.5 -0.12865  0.40375  0.000000  0.00024  0.00027  0.000000 1.63  0.094  0.000  0.000    18  16   304
 48814.5 -0.12723  0.40658  0.000000  0.00014  0.00016  0.000000 2.09  0.003  0.000  0.000    19  17   385
 48815.5 -0.12732  0.40980  0.000000  0.00015  0.00018  0.000000 2.01 -0.009  0.000  0.000    20  17   392
 48816.5 -0.12597  0.41203  0.000000  0.00016  0.00019  0.000000 1.92  0.004  0.000  0.000    20  17   408

Notes:
 1.  RMS is in cm
 2.  MJD 48809.5 through 48810.5 excluded PRN12 based on the RMS which exceeded 2.3 cm.
 3.  MJD 48807.5 is a revised submission, based on elimination of PRN12
 4.  MJD 48813.5 excluded PRN12

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

From:     Teruyuki Kato
Subject:  Satus report/Western Pacific
          ----------------------------

IGS STATUS REPORT (Western Pacific Integrated Network)

The Epoch'92/WING'92 campaign is about to start.
Most stations and the regional data center in this region are ready for the 
campaign.

==========
The regional data center (joint between the Geographical Survey Institute and 
the Earthquake Research Institute) is now located at the Earthquake Reseach 
Institute (see IGSMAIL No.33 for further detail);
	ftp gpstokyo (or ftp 130.69.195.101)
	user name: anonymous
	passwd (your id)

=========
Core sites:
	Usuda     USUD     Japan
	Tsukuba   TSUK     Japan
	Taipei    TAIW     China
	Data of these core sites are routinely archived at operational data 
        center.

Fiducial sites:
	Wuhan     WUHN     China
	Shanghai  SHNG     China
	Nanjin    NANG     China
	Daejeon   DAEN     Korea
	Nobeyama  NBYM     Japan
	Data of these fiducial sites will be sent mostly by separate mails 
        after the Epoch campaign to the regional data center.

Other sites:
	14 stations cluster    NIED   Japan
        3 staions cluster      HDJ    Japan
        4 stations cluster            China
        2 stations cluster            Philippine
	Data of these sites will also be sent by separate mails or INTERNET 
        (if it is available) to the regional data center.

==========	
Regional processing centers;
	National Aerospace Laboratory (PI: Dr. Masaaki Murata)/ Kyoto 
	Unviersity (PI: Dr. Torao Tanaka)
	Geographical Survey Institute (PI: Dr. Hiromichi Tsuji)
	China Planning & Designing Centre of Surveying and Mapping
                                      (PI: Dr. Liang Zhou)

Evaluation Centers;
	National Research Institute for Earth Science and Disaster
	Prevention, Tsukuba (PI: Dr. Seiichi Shimada)
	Hydrographic Department, Maritime Safety Agency, Tokyo
			(PI: Dr. Arata Sengoku)
	National Cheng Kung University, Tainan (PI: unknown)
	Institute of Earth Sciences, Academia Sinica, Taipei
			(PI: Dr. Shui-Beih Yu)

Most of observation data from core sites and fiducial sites are sent to the 
regional processing centers for regional improvements of orbits or for other 
products. Products from IGS are sent to the evaluation centers to evaluate and
compare the products.

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

Any question or comments are welcome. Send your e-mail to:
	[email-masked]
    or  [email-masked]