[IGSREPORT-4246] Wk 0924 G-SINEX Comparisons
AC
AC
Fri Oct 17 06:28:49 PDT 1997
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IGS Electronic Report Fri Oct 17 6:28:49 PDT 1997 Message Number 4246
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0924 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0924
(SEP 21, 1997 - SEP 27, 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:
mit0924g.snx at cddis.gsfc.nasa.gov
jpl0924g.snx at cddis.gsfc.nasa.gov
ncl0924g.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))
jpl0924g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0924g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0924g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0924g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
jpl0924g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0924g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
ncl0924g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0924g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0924g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
jpl0924g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0924g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
ncl0924g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
jpl0924g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0924g.snx: NICO .110 .000 .000 .128 .000 .000 .050 .000 .000
jpl0924g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0924g.snx: SELE .110 .000 .000 .128 .000 .000 .090 .000 .000
jpl0924g.snx: SOFI .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0924g.snx: SOFI .110 .000 .000 .128 .000 .000 .220 .000 .000
jpl0924g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0924g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
ncl0924g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0924g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0924g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
jpl0924g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0924g.snx: YAR1 .078 .000 .000 .096 .000 .000 .081 .000 .000
ncl0924g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
jpl0924g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0924g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0924g.snx
NTUS Multiple Sites
KSTU Multiple Sites
ZWEN Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: NTUS KSTU ZWEN
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0924g.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
XIAN Missing Antenna
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: ASC1 AUCK CHAT DGAR KIRU KWJ1 MKEA VILL XIAN
CONFIDENCE LEVEL FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat KERG MIT-JPL Lat TAHI MIT-JPL Hgt MCM4 JPL-NCL
Hgt MCM4 MIT-JPL Hgt TAHI MIT-NCL
49 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ BAHR BOR1 BRAZ BRMU CAS1 CRO1
DRAO FAIR FORT GOLD GUAM HOB2 IISC IRKT KELY KIT3
KOKB KOSG KOUR LHAS MAC1 MALI MATE MDO1 METS ONSA
PERT POL2 POTS RCM6 REYK SANT SHAO STJO TAIW TIDB
TSKB USUD WES2 WHIT WSRT WTZR WUHN YAR1 YELL
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS:
49 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 0.9 0.9 1.0 6.6 6.5 6.4
Lon 1.8 1.5 1.4 7.3 6.8 7.0
Hgt 3.4 3.8 2.5 12.6 12.5 12.5
3D 4.0 4.1 3.0 16.0 15.6 15.7
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
49 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.127 0.826 0.291 1.792 1.559 1.361
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 -5.8 3.9 5.3 4.0 -11.3 5.8 -1.3 0.4
MIT -5.7 2.7 4.0 2.8 -14.7 3.2 -1.2 0.4
NCL -3.2 4.2 10.7 4.4 -7.0 6.1 -1.3 0.4
REMARKS:
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0924g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0924g.snx :
Stations: TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0924g.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 -32.5
MIT -31.1
NCL -33.0
--
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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