[IGSREPORT-4565] Wk 0931 G-SINEX Comparisons
AC
AC
Tue Feb 3 09:01:14 PST 1998
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IGS Electronic Report Tue Feb 3 9:01:14 PST 1998 Message Number 4565
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0931 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0931
(NOV 9, 1997 - NOV 15, 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:
mit0931g.snx at cddis.gsfc.nasa.gov
jpl0931g.snx at cddis.gsfc.nasa.gov
ncl0931g.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))
jpl0931g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0931g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0931g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0931g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0931g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0931g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 9.8030 M.
jpl0931g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0931g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0931g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0931g.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.
jpl0931g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0931g.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.
jpl0931g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0931g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0931g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0931g.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.
jpl0931g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0931g.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.
jpl0931g.snx: CAGL .110 .000 .000 .128 .000 .000 .000 .000 .000
ncl0931g.snx: FORT .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0931g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0931g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0931g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0931g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0931g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0931g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0931g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0931g.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 TAEJ MIT-JPL Lat OHIG MIT-JPL Lat COCO MIT-JPL
Lat TAEJ MIT-NCL Lat COCO MIT-NCL Lat OHIG MIT-NCL
Lon MAS1 JPL-NCL Lon BRAZ MIT-JPL Lon TAEJ MIT-JPL
Lon AUCK MIT-JPL Lon BRAZ MIT-NCL Lon TAEJ MIT-NCL
Lon AUCK MIT-NCL Lon MAS1 MIT-NCL Hgt TAEJ MIT-JPL
Hgt TAEJ MIT-NCL
60 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 BAHR BOR1 BRMU CAS1 CHAT
CRO1 DGAR DRAO FAIR FLIN GOLD GUAM IISC IRKT KELY
KERG KIRU KIT3 KOKB KOSG KSTU KWJ1 LHAS MAC1 MADR
MATE MCM4 MDO1 METS MKEA NLIB NTUS ONSA PERT POL2
POTS RCM6 REYK SANT SHAO STJO TAHI TAIW THU1 TIDB
TSKB USUD VILL WES2 WHIT WSRT WTZR YAR1 YELL ZWEN
11 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YAR1
YELL
AVERAGE COORDINATE RMS USING ITRF94:
60 GLOBAL STATIONS 11 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 0.9 1.0 0.5 9.4 9.1 9.0
Lon 1.7 1.7 0.7 11.1 10.9 10.6
Hgt 2.8 2.7 1.3 11.6 11.0 10.5
3D 3.4 3.3 1.6 18.6 18.0 17.4
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
60 GLOBAL STATIONS 11 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.044 0.816 0.487 2.797 2.173 2.110
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 -9.5 4.5 1.6 4.7 5.4 6.1 -1.4 0.4
MIT -11.7 2.7 1.5 2.8 0.2 3.2 -1.3 0.3
NCL -9.2 4.4 5.1 4.5 5.5 6.5 -1.3 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0931g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0931g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0931g.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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