[IGSREPORT-4175] Wk 0921 G-SINEX Comparisons
AC
AC
Fri Sep 26 08:57:05 PDT 1997
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IGS Electronic Report Fri Sep 26 8:57:05 PDT 1997 Message Number 4175
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0921 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0921
(AUG 31, 1997 - SEP 6, 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:
mit0921g.snx at cddis.gsfc.nasa.gov
jpl0921g.snx at cddis.gsfc.nasa.gov
ncl0921g.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))
jpl0921g.snx: CRO1 .110 .000 .000 .128 .000 .000 .081 .000 .000
mit0921g.snx: CRO1 .110 .000 .000 .128 .000 .000 8.140 .000 .000
ncl0921g.snx: CRO1 .110 .000 .000 .128 .000 .000 .081 .000 .000
jpl0921g.snx: GODE .110 .000 .000 .128 .000 .000 .061 .000 .000
mit0921g.snx: GODE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0921g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0921g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
ncl0921g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0921g.snx: HBRK .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0921g.snx: HBRK .110 .000 .000 .128 .000 .000 -.008 .000 .000
jpl0921g.snx: KWJ1 .110 .000 .000 .128 .000 .000 .063 .000 .000
mit0921g.snx: KWJ1 .110 .000 .000 .128 .000 .000 .630 .000 .000
jpl0921g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0921g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
ncl0921g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
jpl0921g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .146 .000 .000
mit0921g.snx: MDVO .078 .002 -.003 .074 -.003 -.001 .042 -.005 .006
ncl0921g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .149 .000 .000
jpl0921g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0921g.snx: SELE .110 .000 .000 .128 .000 .000 .091 .000 .000
jpl0921g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0921g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
ncl0921g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0921g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0921g.snx: WUHN .110 .000 .000 .128 .000 .000 2.355 .000 .000
ncl0921g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
jpl0921g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0921g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0921g.snx
ASC1 Missing Antenna
AUCK Missing Antenna
CHAT Missing Antenna
DGAR 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 KWJ1 MKEA VILL
CONFIDENCE LEVEL FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat KERG JPL-NCL Lat FORT MIT-JPL Lat AREQ MIT-JPL
Lon MALI JPL-NCL Lon MALI MIT-JPL Lon RCM6 MIT-NCL
Hgt MCM4 MIT-JPL Hgt KOUR MIT-JPL Hgt MCM4 MIT-NCL
Hgt CAS1 MIT-NCL Hgt KOUR MIT-NCL
41 GLOBAL STATIONS:
ALBH ALGO ANKR BAHR BOR1 BRAZ BRMU DRAO FAIR GOLD
GUAM HOB2 IISC IRKT KELY KIT3 KOKB KOSG LHAS MAC1
MATE MDO1 METS NLIB ONSA PERT POTS REYK SANT SHAO
STJO TAHI TAIW TIDB TSKB USUD WES2 WHIT WTZR YELL
ZWEN
9 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YELL
AVERAGE COORDINATE RMS:
41 GLOBAL STATIONS 9 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.0 1.3 1.0 4.1 3.6 3.5
Lon 2.1 3.4 2.7 6.5 6.5 7.7
Hgt 3.5 4.3 2.8 9.1 9.0 10.3
3D 4.2 5.7 4.0 11.9 11.7 13.4
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
41 GLOBAL STATIONS 9 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.187 0.754 0.419 1.038 0.836 0.938
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 -4.6 4.5 10.5 4.7 -33.2 6.5 -1.9 0.5
MIT -5.4 3.2 8.7 3.4 -42.8 3.8 -1.5 0.4
NCL 0.6 5.0 18.4 5.2 -19.1 7.9 -2.0 0.5
REMARKS:
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0921g.snx :
Stations: HART TROM YAR1
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0921g.snx :
Stations: TROM YAR1
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0921g.snx :
Stations: HART TROM YAR1
MADR WAS NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:
STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
MADR JPL -36.2
MIT -34.2
NCL -37.3
--
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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