[IGSMAIL-114] ESA/ESOC analysis results
Joachim
Joachim
Wed Oct 7 17:58:32 PDT 1992
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IGS Electronic Mail 7-OCT-1992 17:58:32 Message Number 114
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THIS FILE CONTAINS MESSAGES
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^From: Joachim Feltens
Subject: ESA/ESOC analysis results
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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 September 20 - 26
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During the weekends of days 263 to 265 (Sept. 19 - 21) and of days 270 to 272
(Sept. 26 - 28) anti-spoofing has been switched on. Nevertheless data of all
18 satellites has been processed, and the orbits of all GPS-spacecrafts have
been improved.
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1. SOFTWARE USED: GPSOBS/BAHN5
2. MODELS USED AND PARAMETERS ESTIMATED/FIXED
For a description of models and parameters we are using, see IGS-Mail 51. In
The meantime the following changes have been done with respect to that de-
scription:
- satellite clock drift excluded from the modeling (IGS-Mail 101),
- evaluation of 30-hour arcs (IGS-Mail 108),
- changes in the ground stations being used, in their coordinates,
and in their status, i.e. being kept fixed or estimated (for the
current configuration see the table under point 3 "GROUND STA-
TIONS" in this note).
Until now, in the estimation process no a-priori standard deviation values
were given to the initial values of the estimated parameters. Starting with
week 14,the following constraints were given a-priori to the estimated para-
meters:
Satellite position: +- 100 <m>
velocity: +- 10 <cm/sec>
ROCK4(2) scaling factor: +- 5 % deviation from value 1
Y-bias: +- 0.2E-05 <Newton>
ERPs xp: +- 5 <masec>
yp: +- 5 <masec>
Station position: +- 20 <cm>
atm. zenith delay +- 20 <cm>
3. 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. 90 - IGS site
information and coordinates,updated version of IERS/IGS Tables in IGS Mail
No. 65 - (Boucher and Altamimi).
__________________________________________________________________________
| | | GPS WEEK 663 |
| | | 2 2 2 2 2 2 2 |
| | | 6 6 6 6 6 6 7 |
SITE | COUNTRY |CODE| 4 5 6 7 8 9 0 | 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 |
Kokee Park | U.S.A/Hawaii|KOKB| --------------------|
Kourou (ESA) | French Guyan|KOUR| ------------------- | own estim.
Madrid | Spain |MADR| 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 e |
Metsahovi | Finland |METS| F F F F F F F |
Ny Alesund/Spitzb.| Norway |NYAL| ----- e e e e e |
Onsala | Sweden |ONSA| F F F F F F F |
Pamate/Tahiti | France |PAMA| -- e e e --- e e |
Santiago | Chile |SANT| F F F F F ----- |
St.John's, NF | Canada |STJO| e e e e e e e |
Tai-Shi | Taiwan |TAIW| ----- e e e e -- |
Usuda | Japan |USUD| e e e e e e e |
Wettzell | Germany |WETT| -- F F F --- F F |
Yaragadee | Australia |YAR1| -------- F F F F |
Yellowknife | Canada |YELL| F 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.
4. PRODUCTS GENERATED
The following products are generated and stored in CDDIS at NASA/GSFC:
ESA0663*.EPH - Precise GPS orbits, * = 0 for Sunday ,..., 6 for Saturday
ESA06637.ERP - Earth rotation results for week beginning 1992 September 20
ESA06637.SUM - The name of this text file
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^From: Joachim Feltens
Subject: kokee park
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SINCE SEPTEMBER 13 (DAY 257), WE'VE GOTTEN NO DATA FROM THE HAWAIIAN GROUND
STATION KOKEE PARK. ON LATE AFTERNOON OF SEPTEMBER 11 HURRICANE INIKI
SLAMMED INTO THE HAWAIIAN ISLAND KAUAI. AS FAR AS I KNOW, KOKEE PARK IS
LOCATED ON KAUAI. SO HAS KOKEE PARK PERHAPS SUFFERED THE SAME DESTINY
AS RICHMOND IN FLORIDA HAD SOME WEEKS AGO WITH HURRICANE ANDREW?
IGSMAIL: Yes, Kokee Park has suffered from hurrican Iniki but it seems they are
only out of electricity (for the time being). The station and the
receiver have NOT been damaged!
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^From: Tom Clark
Subject: Concerning IGS Mail Archives
----------------------------
Several people have asked about archive copies of the IGS Mail messages.
Here at NASA/Goddard we have been maintaining two sets.
On CDDIS.gsfc.nasa.gov , Carey Noll has been keeping the mail in individual
files in the directory
GPS3:[IGSMAIL]
where the files are named like
IGSMESS.xxx
and where there is a index (one line per contribution) named
IGSMESS.INDEX
The second archive is on my TOMCAT.gsfc.nasa.gov host (which supports
anonymous ftp access beginning at the root /public directory) in the
directory
/public/gps/igs
In that directory you will find the historical messages collected in
groups of ten and compressed with PKZIP in files named like
/public/gps/igs/igs-07x.zip
which contains messages numbered 070 thru 079. The total PKZIP compressed
size for messages 001 thru 110 is about 500 kbytes. In that directory you
will also find a file
/public/gps/igs/index
which is an ASCII mirror of the CDDIS IGSMESS.INDEX file. You will also
find files named like igs.112 which are the current messages being
collected for the next .zip file.
Tom Clark
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^From: IGSMAIL, Bern
Subject: No more IGSMAIL to FAX e-mail adresses
This will be the last IGSMAIL message which will be distributed to FAX
machines! This decision had to be taken due to budget restrictions. We hope
this is not to much of an inconvenience. But we would like to refer to the
possiblity of obtaining the messages by ANONYMOUS FTP from our account in the
directory
AFTP:[IGSMAIL]
where the files are named like
IGSMESS.xxx
and where there is a index (one line per contribution) named
IGSMESS.INDEX
and refer to the information given above in the message from Tom Clark.
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