[IGSREPORT-3679] WK 0899 G-SNX Comparisons
AC
AC
Mon Apr 28 12:33:32 PDT 1997
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IGS Electronic Report Mon Apr 28 12:33:32 PDT 1997 Message Number 3679
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Author: AC Coordinator / NRCan GSDivision
Subject: WK 0899 G-SNX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0899
(MAR 30, 1997 - APR 5, 1997)
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:
mit0899g.snx at cddis.gsfc.nasa.gov
jpl0899g.snx at cddis.gsfc.nasa.gov
ncl0899g.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))
jpl0899g.snx: ANKR .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0899g.snx: ANKR .110 .000 .000 .128 .000 .000 .060 .000 .000
ncl0899g.snx: ANKR .110 .000 .000 .128 .000 .000 .060 .000 .000
jpl0899g.snx: BAHR .000 .000 .000 .000 .000 .000 3.122 .000 .000
mit0899g.snx: BAHR .110 .000 .000 .128 .000 .000 3.122 .000 .000
jpl0899g.snx: BISH .070 .000 .000 .068 .000 .000 .046 .000 .000
mit0899g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0899g.snx: DRAO .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0899g.snx: DRAO .110 .000 .000 .128 .000 .000 .100 .000 .000
ncl0899g.snx: DRAO .110 .000 .000 .128 .000 .000 .100 .000 .000
jpl0899g.snx: GOPE .070 .000 .000 .068 .000 .000 .046 .000 .000
mit0899g.snx: GOPE .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0899g.snx: GRAZ .110 .000 .000 .128 .000 .000 1.964 .000 .000
mit0899g.snx: GRAZ .110 .000 .000 .128 .000 .000 1.946 .000 .000
jpl0899g.snx: HART .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0899g.snx: HART .078 .000 .000 .096 .000 .000 9.754 .000 .000
ncl0899g.snx: HART .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0899g.snx: HRAO .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0899g.snx: HRAO .110 .000 .000 .128 .000 .000 .081 .000 .000
jpl0899g.snx: IISC .110 .000 .000 .128 .000 .000 .078 .000 .000
mit0899g.snx: IISC .110 .000 .000 .128 .000 .000 .078 .000 .000
ncl0899g.snx: IISC .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0899g.snx: JOZE .070 .000 .000 .068 .000 .000 .198 .000 .000
mit0899g.snx: JOZE .069 .000 -.003 .068 -.003 -.001 .198 .000 .000
jpl0899g.snx: MATE .110 .000 .000 .128 .000 .000 .101 .000 .000
mit0899g.snx: MATE .110 .000 .000 .128 .000 .000 .066 .000 .000
ncl0899g.snx: MATE .110 .000 .000 .128 .000 .000 .101 .000 .000
jpl0899g.snx: MONP .000 .000 .000 .000 .000 .000 .119 .000 .000
mit0899g.snx: MONP .110 .000 .000 .128 .000 .000 .119 .000 .000
jpl0899g.snx: TAEJ .000 .000 .000 .000 .000 .000 .660 .000 .000
mit0899g.snx: TAEJ .069 .002 -.001 .068 -.001 .002 .660 .000 .000
jpl0899g.snx: UPAD .070 .000 .000 .068 .000 .000 1.962 .000 .000
mit0899g.snx: UPAD .078 .000 -.003 .074 -.003 -.001 1.962 .000 .000
jpl0899g.snx: UPO1 .110 .000 .000 .128 .000 .000 .078 .000 .000
mit0899g.snx: UPO1 .092 -.001 .000 .060 .000 -.001 .000 .000 .000
jpl0899g.snx: USUD .078 .000 .000 .096 .000 .000 -.035 .000 .000
mit0899g.snx: USUD .110 .000 .000 .128 .000 .000 -.035 .000 .000
ncl0899g.snx: USUD .110 .000 .000 .128 .000 .000 -.035 .000 .000
jpl0899g.snx: WHIT .110 .000 .000 .128 .000 .000 .100 .000 .000
mit0899g.snx: WHIT .110 .000 .000 .128 .000 .000 .010 .000 .000
jpl0899g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0899g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
ncl0899g.snx: YAR1 .000 .000 .000 .000 .000 .000 .073 .000 .000
jpl0899g.snx: ZIMM .070 .000 .000 .068 .000 .000 .000 .000 .000
mit0899g.snx: ZIMM .069 .000 -.003 .068 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0899g.snx
MDVO Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: MDVO
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0899g.snx
ASC1 Missing Antenna
AUCK Missing Antenna
CHAT Missing Antenna
DGAR Missing Antenna
KWJ1 Missing Antenna
MKEA Missing Antenna
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: ASC1 AUCK CHAT DGAR KWJ1 MKEA YAR1
CONFIDENCE LEVEL FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat MCM4 JPL-NCL Lat BRAZ JPL-NCL Lat SANT JPL-NCL
Lon COCO JPL-NCL Lon PAMA JPL-NCL Lon PAMA MIT-JPL
Lon COCO MIT-JPL Hgt IRKT JPL-NCL Hgt CRO1 JPL-NCL
Hgt IRKT MIT-JPL Hgt WUHN MIT-NCL
40 GLOBAL STATIONS:
ALBH ALGO BOR1 BRMU CAS1 DAV1 FAIR FORT GOLD GUAM
HART HOB2 KELY KERG KIT3 KOKB KOSG KOUR LHAS MAC1
MALI MDO1 METS NLIB NYAL ONSA PERT POTS RCM6 REYK
SHAO STJO TAIW TIDB TSKB WES2 WTZR YAR1 YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD HART KOKB KOSG TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS:
40 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.9 1.4 3.0 5.7 6.1 5.5
Lon 1.9 1.4 2.4 8.2 8.1 7.6
Hgt 3.6 2.4 4.9 8.7 8.5 10.0
3D 4.5 3.1 6.2 13.2 13.2 13.8
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
40 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.587 0.708 0.242 0.548 0.404 0.531
OFFSETS AND SCALE FACTOR WRT ITRF94 (FIDUCIAL STATIONS):
Tx (mm) STD(mm) Ty (mm) STD(mm) Tz (mm) STD(mm) Scale (ppb) STD(ppb)
------- ------- ------- ------- ------- ------- ----------- --------
JPL 2.8 5.2 13.9 5.4 -50.0 7.1 -2.7 0.6
MIT 0.6 4.3 13.2 4.4 -44.2 5.1 -2.4 0.6
NCL 2.5 5.0 23.8 5.2 -26.9 6.5 -2.1 0.6
REMARKS:
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0899g.snx :
Stations: TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0899g.snx :
Stations: TROM
MADR WAS NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:
LONGITUDE RMS AT 11 FIDUCIAL STATIONS HIGHER THAN USUAL. FOLLOWING
STATIONS HAVE LONGITUDE DIFFERENCES WITH ITRF94 IN EXCESS OF 4 CM.:
Stations: MADR
STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
MADR JPL 56.5
MIT 56.8
NCL 49.0
--
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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