[IGSREPORT-4313] Wk 0925 G-SINEX Comparisons
AC
AC
Mon Nov 10 13:48:42 PST 1997
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IGS Electronic Report Mon Nov 10 13:48:42 PST 1997 Message Number 4313
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0925 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0925
(SEP 28, 1997 - OCT 4, 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:
mit0925g.snx at cddis.gsfc.nasa.gov
jpl0925g.snx at cddis.gsfc.nasa.gov
ncl0925g.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))
jpl0925g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0925g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0925g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0925g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
jpl0925g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0925g.snx: HARK .078 .000 .000 .096 .000 .000 9.803 .000 .000
ncl0925g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0925g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0925g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
jpl0925g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0925g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
ncl0925g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
jpl0925g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0925g.snx: NICO .110 .000 .000 .128 .000 .000 .050 .000 .000
jpl0925g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0925g.snx: SELE .110 .000 .000 .128 .000 .000 .090 .000 .000
jpl0925g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0925g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
ncl0925g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0925g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0925g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
jpl0925g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0925g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0925g.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):
Lon MDO1 MIT-JPL Lon NTUS MIT-JPL Lon MDO1 MIT-NCL
Lon NTUS MIT-NCL Hgt THU1 JPL-NCL Hgt WUHN MIT-JPL
Hgt FORT MIT-JPL Hgt HOB2 MIT-JPL Hgt CAS1 MIT-NCL
Hgt WUHN MIT-NCL Hgt FORT MIT-NCL Hgt HOB2 MIT-NCL
49 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ BAHR BOR1 BRAZ BRUS COCO CRO1
DRAO FAIR GOLD GUAM IISC IRKT KELY KERG KIT3 KOKB
KOSG KOUR KSTU LHAS MAC1 MALI MATE MCM4 METS NLIB
ONSA PERT POL2 POTS RCM6 REYK SHAO STJO TAHI TAIW
TIDB TSKB USUD WES2 WHIT WSRT WTZR YELL ZWEN
8 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG TIDB WTZR YELL
AVERAGE COORDINATE RMS:
49 GLOBAL STATIONS 8 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 2.1 2.0 0.8 2.8 2.1 2.3
Lon 2.5 2.1 1.2 7.7 6.3 6.4
Hgt 3.6 3.7 2.5 5.8 4.6 5.2
3D 4.9 4.7 2.9 10.1 8.1 8.5
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
49 GLOBAL STATIONS 8 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.167 1.199 0.629 0.832 0.385 0.533
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 -1.2 4.4 3.0 4.9 -1.3 6.2 -2.0 0.5
MIT -2.6 3.3 3.8 3.9 5.7 3.4 -2.1 0.5
NCL 2.3 4.4 4.7 4.9 9.0 5.5 -2.0 0.5
REMARKS:
EXPERIENCED SOME DIFFICULTY DECONSTRAINING FILE mit0925g.snx.
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0925g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0925g.snx :
Stations: TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0925g.snx :
Stations: HART TROM
MADR, YAR1, SANT WERE NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:
STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
MADR JPL -27.0
MIT -51.9
NCL -28.3
YAR1 MIT -34.0
SANT MIT -33.2
--
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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