[IGSREPORT-4635] Wk 0942 G-SINEX Comparisons
AC
AC
Tue Feb 24 07:23:10 PST 1998
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IGS Electronic Report Tue Feb 24 7:23:10 PST 1998 Message Number 4635
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0942 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0942
(JAN 25, 1998 - JAN 31, 1998)
Contacts: J. Kouba (kouba at geod.emr.ca)
D. Hutchison(hutch at geod.emr.ca)
COMPARISON ALGORITHM:
1. MIT and NCL GNAAC combined SINEX solutions for the week in question
were deconstrained. The JPL SINEX file is already unconstrained.
2. Any stations not present in all GNAAC combined SINEX files were de-
leted from all three combined solutions. Every solution was then sub-
jected to a 7-parameter transformation into a common reference system
(the 13 ITRF94 station positions).
3. Outliers are determined at the 99.0% confidence level for each coordin-
ate. If a station has an outlier in either latitude, longitude, or
height, it is ignored in all subsequent computations.
FILES COMPARED:
mit0942g.snx at cddis.gsfc.nasa.gov
jpl0942g.snx at cddis.gsfc.nasa.gov
ncl0942g.snx at cddis.gsfc.nasa.gov
GNAACs: MIT JPL NCL
STATIONS WITH INCONSISTENT ANTENNA ECCENTRICITY INFORMATION:
(FILE: / STATION / L1 (UNE) / L2 (UNE) / ECCENTRICITY (UNE))
(UNE = Up North East (metres))
jpl0942g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0942g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0942g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0942g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0942g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0942g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0942g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0942g.snx: KOUR .078 .000 .000 .096 .000 .000 .045 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.045 M.
jpl0942g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0942g.snx: MALI .078 .000 .000 .096 .000 .000 .135 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.135 M.
jpl0942g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0942g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0942g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0942g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 2.355 M.
jpl0942g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0942g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0942g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0942g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0942g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0942g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0942g.snx: UPAD .078 .000 -.003 .074 -.003 -.001 1.962 .000 .000
jpl0942g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0942g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0942g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.
CONFIDENCE LEVEL FOR OUTLIER DETECTION (ITRF94): 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat CAS1 MIT-JPL Lat KERG MIT-JPL Lat DAV1 MIT-JPL
Lat MAC1 MIT-JPL Lat CAS1 MIT-NCL Lat MAC1 MIT-NCL
Lat DAV1 MIT-NCL Lon CHAT MIT-JPL Lon AREQ MIT-JPL
Lon NTUS MIT-JPL Lon EISL MIT-JPL Lon DAV1 MIT-NCL
Lon AUCK MIT-NCL Lon CHAT MIT-NCL Lon EISL MIT-NCL
Hgt DGAR MIT-JPL Hgt USUD MIT-JPL Hgt NTUS MIT-NCL
Hgt KERG MIT-NCL
56 GLOBAL STATIONS:
ALBH ALGO ANKR ASC1 BAHR BOR1 BRAZ BRMU BRUS CRO1
DRAO FAIR FORT GOL2 GOLD GRAZ GUAM HOB2 IISC IRKT
KELY KIRU KIT3 KOKB KOSG KWJ1 MADR MAS1 MATE MDO1
METS MKEA NLIB NRC1 OHIG ONSA PERT POL2 POTS RCM6
REYK SANT SHAO STJO TAEJ TIDB TSKB USNO VILL WES2
WHIT WSRT WTZR XIAN YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YELL
AVERAGE COORDINATE RMS USING ITRF94:
56 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.7 2.1 0.7 8.7 8.9 9.0
Lon 2.3 2.3 1.2 9.0 8.1 8.0
Hgt 4.0 4.9 2.7 9.4 7.1 7.7
3D 4.9 5.8 3.0 15.7 13.9 14.3
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
56 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.161 1.474 0.574 2.413 1.832 1.615
OFFSETS AND SCALE FACTOR WRT ITRF94 (FIDUCIAL STATIONS):
(TRANSFORMATION FROM ITRF94 TO GNAAC SINEX FILES)
Tx (mm) STD(mm) Ty (mm) STD(mm) Tz (mm) STD(mm) Scale (ppb) STD(ppb)
------- ------- ------- ------- ------- ------- ----------- --------
JPL -5.2 6.5 18.9 6.4 27.3 7.5 -2.1 0.4
MIT -9.6 2.8 -2.3 3.0 16.0 3.0 -1.9 0.4
NCL -2.9 4.8 14.3 5.0 30.2 7.0 -2.0 0.5
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0942g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0942g.snx :
Stations: TROM YAR1
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0942g.snx :
Stations: HART TROM YAR1
--
David Hutchison
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: hutch at geod.emr.ca
[Mailed From: David Hutchison <hutch at geod.emr.ca>]
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