[IGSREPORT-4568] Wk 0935 G-SINEX Comparisons
AC
AC
Tue Feb 3 10:21:20 PST 1998
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IGS Electronic Report Tue Feb 3 10:21:20 PST 1998 Message Number 4568
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0935 G-SINEX Comparisons
Subject: Wk 0935 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0935
(DEC 7, 1997 - DEC 13, 1997)
Contacts: J. Kouba (kouba at geod.emr.ca)
D. Hutchison (hutch at geod.emr.ca)
R. Ferland (ferland 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:
mit0935g.snx at cddis.gsfc.nasa.gov
jpl0935g.snx at cddis.gsfc.nasa.gov
ncl0935g.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))
jpl0935g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0935g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0935g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0935g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0935g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0935g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0935g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0935g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0935g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0935g.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.
jpl0935g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0935g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.081 M.
mit0935g.snx: GODE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0935g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0935g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0935g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
jpl0935g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0935g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0935g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0935g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0935g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0935g.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 OHIG MIT-JPL Lat KERG MIT-NCL Lat OHIG MIT-NCL
Lat HOB2 MIT-NCL Lat CAS1 MIT-NCL Lon NTUS MIT-JPL
Lon AUCK MIT-NCL Hgt DGAR MIT-NCL Hgt MCM4 MIT-NCL
Hgt AREQ MIT-NCL
52 GLOBAL STATIONS:
ALBH ALGO ANKR ASC1 BAHR BRAZ BRMU CHAT COCO CRO1
DRAO EISL FAIR FORT GOLD GUAM IISC IRKT KIRU KIT3
KOKB KOSG KSTU KWJ1 MAC1 MADR MAS1 MATE MDO1 METS
MKEA NLIB ONSA PERT POL2 RCM6 REYK SANT SHAO STJO
TAHI THU1 TIDB TSKB USUD VILL WES2 WHIT WTZR YAR1
YELL ZWEN
11 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YAR1
YELL
AVERAGE COORDINATE RMS USING ITRF94:
52 GLOBAL STATIONS 11 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.2 2.0 1.4 7.8 7.6 7.6
Lon 1.9 2.6 1.9 10.1 9.4 8.9
Hgt 2.6 5.4 3.9 11.4 12.1 12.5
3D 3.5 6.3 4.5 17.1 17.1 17.1
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
52 GLOBAL STATIONS 11 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.251 0.790 0.901 2.401 1.792 1.816
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 -6.0 4.1 2.3 4.4 -5.2 6.2 -1.4 0.4
MIT -2.1 2.7 -3.7 2.8 -13.9 3.3 -1.3 0.3
NCL -9.1 4.4 10.4 4.5 8.3 6.4 -1.6 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0935g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0935g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0935g.snx :
Stations: HART TROM
--
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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