[IGSREPORT-3996] Wk 0912 G-SINEX Comparisons
AC
AC
Thu Jul 31 09:35:44 PDT 1997
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IGS Electronic Report Thu Jul 31 9:35:44 PDT 1997 Message Number 3996
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0912 G-SINEX Comparisons
Subject: Wk 0912 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0912
(JUN 29, 1997 - JUL 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:
mit0912g.snx at cddis.gsfc.nasa.gov
jpl0912g.snx at cddis.gsfc.nasa.gov
ncl0912g.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))
jpl0912g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0912g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0912g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
ncl0912g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0912g.snx: HARV .110 .000 .000 .128 .000 .000 .061 .000 .000
mit0912g.snx: HARV .110 .000 .000 .128 .000 .000 .099 .000 .000
jpl0912g.snx: JOZE .078 .000 -.003 .074 -.003 -.001 .198 .000 .000
mit0912g.snx: JOZE .078 .000 .003 .074 .003 .001 .198 .000 .000
jpl0912g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0912g.snx: TAEJ .078 .002 .003 .074 .003 .001 .660 .000 .000
ncl0912g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0912g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0912g.snx: WUHN .110 .000 .000 .128 .000 .000 2.355 .000 .000
ncl0912g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
jpl0912g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0912g.snx: ZIMM .078 .000 .003 .074 .003 .001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0912g.snx
AREQ Multiple Sites
MDVO Multiple Sites
HARK Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: AREQ MDVO HARK
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0912g.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-NCL Lat DAV1 MIT-NCL Lon FORT JPL-NCL
Lon MCM4 JPL-NCL Lon DAV1 MIT-JPL Lon NYAL MIT-NCL
Hgt MCM4 JPL-NCL Hgt CRO1 JPL-NCL Hgt MCM4 MIT-JPL
Hgt MCM4 MIT-NCL Hgt CRO1 MIT-NCL
47 GLOBAL STATIONS:
ALBH ALGO BAHR BOR1 BRAZ BRMU BRUS CAS1 DRAO FAIR
FLIN GOLD GUAM HOB2 IISC IRKT KELY KIT3 KOKB KOSG
LHAS MAC1 MALI MATE MDO1 METS NLIB ONSA PERT POL2
POTS RCM6 REYK SANT SHAO STJO TAHI TAIW TIDB TSKB
USUD WES2 WHIT WTZR YAR1 YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS:
47 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 1.4 1.4 7.4 6.8 6.7
Lon 1.7 1.7 1.6 8.9 8.3 8.2
Hgt 4.4 4.7 1.9 10.5 11.2 11.1
3D 4.8 5.2 2.8 15.6 15.6 15.3
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
47 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.077 0.784 0.576 1.806 1.780 1.373
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 -2.2 4.4 34.2 4.5 -29.3 7.8 -1.7 0.4
MIT -0.9 3.0 23.3 3.0 -23.4 3.9 -1.8 0.4
NCL 2.2 4.4 25.1 4.6 -11.4 6.9 -1.8 0.4
REMARKS:
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0912g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0912g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0912g.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 -29.4
MIT -29.9
NCL -30.1
--
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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