[IGSREPORT-4126] Wk 0917 G-SINEX Comparisons
AC
AC
Fri Sep 12 14:03:46 PDT 1997
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IGS Electronic Report Fri Sep 12 14:03:46 PDT 1997 Message Number 4126
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0917 G-SINEX Comparisons
Subject: Wk 0917 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0917
(AUG 3, 1997 - AUG 9, 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:
mit0917g.snx at cddis.gsfc.nasa.gov
jpl0917g.snx at cddis.gsfc.nasa.gov
ncl0917g.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))
jpl0917g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0917g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0917g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0917g.snx: HARK .110 .000 .000 .128 .000 .000 9.802 .000 .000
ncl0917g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0917g.snx: HBRK .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0917g.snx: HBRK .110 .000 .000 .128 .000 .000 -.009 .000 .000
jpl0917g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0917g.snx: SELE .110 .000 .000 .128 .000 .000 .089 .000 .000
jpl0917g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0917g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
ncl0917g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0917g.snx: USUD .110 .000 .000 .128 .000 .000 -.035 .000 .000
mit0917g.snx: USUD .078 .000 .000 .096 .000 .000 -.035 .000 .000
ncl0917g.snx: USUD .110 .000 .000 .128 .000 .000 -.035 .000 .000
jpl0917g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
jpl0917g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0917g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0917g.snx
AREQ Multiple Sites
YAR1 Multiple Sites
COCO Multiple Sites
BAHR Multiple Sites
MDVO Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: AREQ YAR1 COCO BAHR MDVO
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0917g.snx
AUCK Missing Antenna
CHAT Missing Antenna
DGAR Missing Antenna
KWJ1 Missing Antenna
MKEA Missing Antenna
XIAN Missing Antenna
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: AUCK CHAT DGAR KWJ1 MKEA XIAN
CONFIDENCE LEVEL FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat FORT MIT-JPL Lon KOUR MIT-JPL Hgt FORT JPL-NCL
Hgt CRO1 JPL-NCL Hgt CRO1 MIT-JPL Hgt MCM4 MIT-JPL
Hgt FORT MIT-JPL Hgt MCM4 MIT-NCL Hgt CRO1 MIT-NCL
44 GLOBAL STATIONS:
ALBH ALGO ANKR BRAZ BRMU CAS1 DAV1 DRAO FAIR GOLD
GUAM HOB2 IISC IRKT KERG KIT3 KOKB KOSG MAC1 MALI
MATE MDO1 METS NLIB NYAL ONSA PERT POTS RCM6 REYK
SANT SHAO STJO TAIW THU1 TIDB TSKB WES2 WHIT WTZR
WUHN YAR1 YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS:
44 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.3 1.0 1.1 5.6 5.5 6.2
Lon 1.8 1.8 1.0 7.9 8.2 8.0
Hgt 4.3 4.6 4.9 7.8 8.7 8.9
3D 4.9 5.0 5.1 12.4 13.1 13.5
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
44 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.365 0.746 0.342 1.185 1.144 1.100
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 -0.5 4.0 23.7 4.2 -39.4 5.7 -1.4 0.4
MIT -1.2 2.9 25.2 3.0 -41.7 3.6 -1.3 0.4
NCL 5.8 4.7 31.1 5.0 -26.0 6.5 -1.3 0.4
REMARKS:
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0917g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0917g.snx :
Stations: TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0917g.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 -30.5
MIT -28.9
NCL -31.3
--
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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