[IGSMAIL-51] ESOC analysis description
J.
J.
Thu Jul 23 09:01:21 PDT 1992
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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
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ANALYSIS CENTRE: ESA/ESOC
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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:
teru at eri.u-tokyo.ac.jp
or gdic at gpstokyo.eri.u-tokyo.ac.jp
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