[IGSREPORT-4551] Wk 0928 G-SINEX Comparisons
AC
AC
Mon Feb 2 07:30:25 PST 1998
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IGS Electronic Report Mon Feb 2 7:30:25 PST 1998 Message Number 4551
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0928 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0928
(OCT 19, 1997 - OCT 25, 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:
mit0928g.snx at cddis.gsfc.nasa.gov
jpl0928g.snx at cddis.gsfc.nasa.gov
ncl0928g.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))
jpl0930g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0928g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0928g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0928g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0928g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0928g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0928g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0928g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0929g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0929g.snx: WUHN .110 .000 .000 .128 .000 .000 2.285 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 2.355 M.
jpl0932g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0932g.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: 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.
ncl0928g.snx: FORT .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0928g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0928g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0932g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
jpl0928g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0928g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0928g.snx: SFER .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0928g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0928g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0928g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0928g.snx
MALI Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: MALI
CONFIDENCE LEVEL FOR OUTLIER DETECTION (ITRF94): 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat NLIB JPL-NCL Lat KIT3 MIT-JPL Lat ASC1 MIT-JPL
Lat HOB2 MIT-JPL Lat NLIB MIT-JPL Lat ASC1 MIT-NCL
Lon KERG MIT-JPL Lon MAC1 MIT-NCL Lon KERG MIT-NCL
Lon HOB2 MIT-NCL Hgt CAS1 JPL-NCL Hgt MAS1 MIT-JPL
Hgt HOB2 MIT-JPL Hgt CAS1 MIT-NCL Hgt MAS1 MIT-NCL
Hgt MCM4 MIT-NCL Hgt HOB2 MIT-NCL
55 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ AUCK BAHR BOR1 BRAZ BRMU CHAT
COCO CRO1 DGAR DRAO FAIR GOLD GUAM IISC IRKT KELY
KIRU KOKB KOSG KSTU KWJ1 LHAS MATE MDO1 METS MKEA
NRC1 NTUS ONSA PERT POL2 POTS RCM6 REYK SANT SHAO
STJO TAHI TAIW THU1 TIDB TSKB USUD VILL WES2 WHIT
WSRT WTZR YAR1 YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS USING ITRF94:
55 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.5 1.0 1.0 7.4 7.3 7.4
Lon 1.4 1.3 1.1 9.2 9.2 9.1
Hgt 2.3 3.1 2.7 9.9 10.7 10.0
3D 3.1 3.5 3.1 15.4 15.8 15.4
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
55 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.111 0.303 0.193 1.851 1.620 1.591
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 -2.7 4.3 5.6 4.4 -31.1 6.2 -1.7 0.4
MIT -2.3 3.0 6.0 3.1 -35.8 3.8 -1.6 0.4
NCL 2.1 4.4 8.0 4.5 -18.2 6.2 -1.9 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0928g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0928g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0928g.snx :
Stations: HART TROM
MADR WAS NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:
STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
MADR JPL -23.3
MIT -21.6
NCL -24.8
--
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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