[IGSREPORT-4567] Wk 0933 G-SINEX Comparisons
AC
AC
Tue Feb 3 10:09:09 PST 1998
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IGS Electronic Report Tue Feb 3 10:09:09 PST 1998 Message Number 4567
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0933 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0933
(NOV 23, 1997 - NOV 29, 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:
mit0933g.snx at cddis.gsfc.nasa.gov
jpl0933g.snx at cddis.gsfc.nasa.gov
ncl0933g.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))
jpl0933g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0933g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0933g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0933g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0933g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0933g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0933g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0933g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0933g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0933g.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.
jpl0933g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0933g.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.
jpl0933g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0933g.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.
jpl0933g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0933g.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.
jpl0933g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0933g.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.
jpl0933g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0933g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
ncl0933g.snx: MDVO Antenna missing. .146 .000 .000
jpl0933g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0933g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0933g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0933g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0933g.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 KERG MIT-JPL Lat KERG MIT-NCL Lat ASC1 MIT-NCL
Lat CAS1 MIT-NCL Lat COCO MIT-NCL Lat PERT MIT-NCL
Lon NTUS MIT-JPL Lon ASC1 MIT-NCL Lon NTUS MIT-NCL
Lon TAHI MIT-NCL Lon TAIW MIT-NCL Lon AUCK MIT-NCL
Hgt TAIW MIT-JPL Hgt FORT MIT-JPL Hgt SANT MIT-NCL
Hgt TAIW MIT-NCL Hgt TAHI MIT-NCL Hgt FORT MIT-NCL
57 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ BAHR BOR1 BRMU CHAT CRO1 DGAR
DRAO FAIR FLIN GOLD GRAZ GUAM HOB2 IISC IRKT KELY
KIRU KIT3 KOKB KOSG KSTU KWJ1 LHAS MAC1 MADR MAS1
MATE MCM4 MDO1 METS MKEA NLIB OHIG ONSA POL2 POTS
RCM6 REYK SHAO STJO TAEJ THU1 TIDB TSKB USUD VILL
WES2 WHIT WSRT WTZR YAR1 YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS USING ITRF94:
57 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.1 1.5 0.7 7.8 7.8 7.6
Lon 1.7 2.1 1.2 10.7 9.6 9.5
Hgt 2.5 2.3 1.4 10.0 10.3 9.9
3D 3.2 3.4 2.0 16.6 16.1 15.7
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
57 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.060 0.553 0.371 2.276 1.889 1.754
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 -3.7 4.7 -0.2 5.2 17.8 6.5 -1.6 0.4
MIT -0.4 2.7 -5.2 3.0 13.9 3.1 -1.5 0.4
NCL -5.0 4.5 7.5 4.7 17.1 6.6 -1.4 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0933g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0933g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0933g.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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