[IGSREPORT-4211] Wk 0923 G-SINEX Comparisons
AC
AC
Wed Oct 8 12:19:01 PDT 1997
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IGS Electronic Report Wed Oct 8 12:19:01 PDT 1997 Message Number 4211
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0923 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0923
(SEP 14, 1997 - SEP 20, 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:
mit0923g.snx at cddis.gsfc.nasa.gov
jpl0923g.snx at cddis.gsfc.nasa.gov
ncl0923g.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))
jpl0923g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0923g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
jpl0923g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0923g.snx: GALA .110 .000 .000 .128 .000 .000 .082 .000 .000
jpl0923g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0923g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
ncl0923g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0923g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0923g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
jpl0923g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0923g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
ncl0923g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
jpl0923g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .146 .000 .000
mit0923g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .146 .000 .000
ncl0923g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .149 .000 .000
jpl0923g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0923g.snx: NICO .110 .000 .000 .128 .000 .000 .050 .000 .000
jpl0923g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0923g.snx: SELE .110 .000 .000 .128 .000 .000 .090 .000 .000
jpl0923g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0923g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
ncl0923g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0923g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0923g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
jpl0923g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0923g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0923g.snx
KSTU Multiple Sites
ZWEN Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: KSTU ZWEN
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0923g.snx
ASC1 Missing Antenna
AUCK Missing Antenna
CHAT Missing Antenna
DGAR Missing Antenna
KIRU Missing Antenna
KWJ1 Missing Antenna
MKEA Missing Antenna
VILL Missing Antenna
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: ASC1 AUCK CHAT DGAR KIRU KWJ1 MKEA VILL
CONFIDENCE LEVEL FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat KERG JPL-NCL Lat HOB2 MIT-NCL Lon MALI MIT-JPL
Lon MALI MIT-NCL Hgt MCM4 JPL-NCL Hgt MCM4 MIT-JPL
Hgt WUHN MIT-JPL Hgt CAS1 MIT-NCL Hgt MCM4 MIT-NCL
Hgt WUHN MIT-NCL
46 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ BAHR BOR1 BRAZ BRMU CRO1 DRAO
FAIR FORT GOLD GUAM IISC IRKT KELY KIT3 KOKB KOSG
KOUR LHAS MAC1 MATE MDO1 METS NLIB NRC1 ONSA PERT
POL2 POTS RCM6 REYK SANT SHAO STJO TAHI TAIW TIDB
TSKB USUD WES2 WHIT WTZR YELL
9 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YELL
AVERAGE COORDINATE RMS:
46 GLOBAL STATIONS 9 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 0.8 1.5 1.1 4.3 4.2 3.9
Lon 1.7 2.3 2.8 6.5 6.9 7.5
Hgt 3.4 2.9 2.4 10.3 10.6 10.8
3D 3.8 4.0 3.9 12.9 13.3 13.7
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
46 GLOBAL STATIONS 9 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.150 0.813 0.248 1.175 0.991 1.070
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 -1.1 4.2 14.5 4.4 -23.0 6.2 -1.5 0.5
MIT -1.0 3.1 10.0 3.3 -20.5 3.6 -1.5 0.4
NCL 1.2 4.3 10.4 4.4 -7.6 6.2 -1.6 0.5
REMARKS:
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0923g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0923g.snx :
Stations: TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0923g.snx :
Stations: HART TROM
MADR, YAR1 WERE NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:
STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
MADR JPL -33.4
MIT -30.5
NCL -32.8
STATION / GNAAC / HEIGHT DIFFERENCE (mm.):
MADR JPL 21.4
MIT 19.0
NCL 20.4
STATION / GNAAC / HEIGHT DIFFERENCE (mm.):
YAR1 JPL -36.7
MIT -31.3
NCL -40.1
--
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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