[IGSMAIL-2799]: JPL 1s data processing change, PIMO and USUD back on
Dave Stowers
dstowers at jpl.nasa.gov
Fri Apr 14 18:25:56 PDT 2000
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IGS Electronic Mail 14 Apr 18:25:56 PDT 2000 Message Number 2799
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Author: Dave Stowers
Dear Colleagues,
As you may already know, several sites are operating with a 1s samplerate
and later converted to 30s RINEX. Some have been operated in this mode with the
intention of alleviating the L2 tracking problems being experienced by some
receivers. Others are operated in this mode to provide support for LEO missions.
The purpose of this message is to announce the introduction of changes to
the process used at JPL to convert the 1s offload format to 30s RINEX.
Old method: 1s data translated to 1s TurboBinary format,
1s TurboBinary 'normal-pointed' to 30s TurboBinary,
30s TurboBinary translated to RINEX using teqc
New method: 1s data 'normal-pointed' and translated to 30s RINEX using soc2rnx,
RINEX is passed through teqc as a check and to add header info
The IGS sites currently operating in this mode are:
FAIR - ACT
SANT - ACT
KOKB - ACT
CRO1 - ACT
GALA - z12
PIMO - TR
USUD - TR
Please note that this change does not specifically address the concerns
regarding the usability of TurboRogue data from PIMO and USUD for all
applications, but data from those sites will be made available again so
that applications which can benefit from their use can do so. The change
is intended to allow us to begin publishing data from sites which have
replacement receivers operating. IGSmail notices and sitelog updates will be
forthcoming, starting with MKEA.
The RINEX files produced using soc2rnx include sufficient header information
to determine that a particular file was processed using the new method.
An example hourly RINEX header for site FAIR follows
(and indicates that both soc2rnx and teqc have operated on the data):
2.10 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE
teqc 2000Feb3 gpsops 20000414 23:01:52UTCPGM / RUN BY / DATE
30.0000 INTERVAL
1 1 WAVELENGTH FACT L1/2
5 L1 L2 P1 P2 C1 # / TYPES OF OBSERV
OSF1 V4.0 564|Alpha|cc 4.4.18.4|=+|=| COMMENT
soc2rnx ver 1.2 04/14/2000 gps 14-Apr-2000 23:01:50.000UTC COMMENT
SNR is mapped to RINEX snr flag value [1,4-9] COMMENT
SNR: >316 >100 >31.6 >10 >3.2 >0 bad=0 COMMENT
L1 & L2: 9 8 7 6 5 4 1 COMMENT
COMMENT
This data is provided as a public service by NASA/JPL. COMMENT
No warranty is expressed or implied regarding suitability COMMENT
for use. For further information, contact: COMMENT
Dave Stowers, NASA/JPL m/s 238-600 COMMENT
4800 Oak Grove Drive, Pasadena CA 91109 USA COMMENT
COMMENT
2000 4 14 22 0 0.0000000 GPS TIME OF FIRST OBS
GNOG JPL OBSERVER / AGENCY
175 AOAD/M_T JPLA ANT # / TYPE
-2281621.4021 -1453595.7944 5756961.9292 APPROX POSITION XYZ
0.0863 0.0000 0.0000 ANTENNA: DELTA H/E/N
R134-U AOA SNR-8100 ACT 3.3.32.2 REC # / TYPE / VERS
FAIR MARKER NAME
40408M001 MARKER NUMBER
END OF HEADER
Best regards,
-dave
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David Stowers, JPL/Caltech, Satellite Geodesy and Geodynamics Systems
4800 Oak Grove Drive, M/S 238-600, Pasadena, CA, USA
Tel. +1 818-354-7055, fax +1 818-393-4965, E-mail dstowers at jpl.nasa.gov
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