[IGSREPORT-4307] Subject
AC
AC
Thu Nov 6 07:00:08 PST 1997
IGS Electronic Report Thu Nov 6 7:00:08 PST 1997 Message Number 4307
******************************************************************************
Author: AC Coordinator / NRCan GSDivision
Subject: Subject: Wk 0927 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0927
(OCT 12, 1997 - OCT 18, 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:
mit0927g.snx at cddis.gsfc.nasa.gov
jpl0927g.snx at cddis.gsfc.nasa.gov
ncl0927g.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))
jpl0927g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0927g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0927g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0927g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
jpl0927g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0927g.snx: GALA .110 .000 .000 .128 .000 .000 .082 .000 .000
jpl0927g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0927g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
jpl0927g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0927g.snx: KOUR .110 .000 .000 .128 .000 .000 .045 .000 .000
jpl0927g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0927g.snx: LPGS .110 .000 .000 .128 .000 .000 .046 .000 .000
jpl0927g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0927g.snx: NICO .110 .000 .000 .128 .000 .000 .050 .000 .000
jpl0927g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0927g.snx: SELE .110 .000 .000 .128 .000 .000 .091 .000 .000
jpl0927g.snx: SFER .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0927g.snx: SFER .110 .000 .000 .128 .000 .000 1.608 .000 .000
jpl0927g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0927g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
jpl0927g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0927g.snx: ZECK .110 .000 .000 .128 .000 .000 .045 .000 .000
jpl0927g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0927g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
CONFIDENCE LEVEL FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat CAS1 JPL-NCL Lat BRAZ JPL-NCL Lat AREQ JPL-NCL
Lat SANT JPL-NCL Lat KERG MIT-NCL Lon MALI JPL-NCL
Lon TAEJ MIT-JPL Lon MALI MIT-JPL Lon TAEJ MIT-NCL
Lon FORT MIT-NCL Lon AUCK MIT-NCL Hgt MCM4 MIT-JPL
Hgt CAS1 MIT-JPL Hgt MAS1 MIT-JPL Hgt TAEJ MIT-JPL
Hgt CAS1 MIT-NCL Hgt MCM4 MIT-NCL Hgt MAS1 MIT-NCL
Hgt TAEJ MIT-NCL
56 GLOBAL STATIONS:
ALBH ALGO ANKR ASC1 BAHR BOR1 BRUS CHAT COCO CRO1
DGAR DRAO FAIR GOLD GUAM HOB2 IISC IRKT KELY KIRU
KIT3 KOKB KOSG KSTU KWJ1 LHAS MAC1 MATE MDO1 MDVO
METS MKEA NLIB NTUS ONSA PERT POL2 POTS RCM6 REYK
SHAO STJO TAHI THU1 TIDB TSKB USUD VILL WES2 WHIT
WSRT WTZR WUHN YAR1 YELL ZWEN
9 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS:
56 GLOBAL STATIONS 9 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.3 1.0 1.4 6.8 6.3 6.7
Lon 2.0 2.2 1.9 10.3 8.6 8.9
Hgt 3.3 3.7 2.9 12.0 11.7 10.3
3D 4.1 4.4 3.7 17.2 15.8 15.2
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
56 GLOBAL STATIONS 9 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.220 0.911 0.590 2.357 1.575 1.534
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 -7.2 4.2 14.6 4.4 -11.9 6.3 -1.7 0.4
MIT -7.0 3.0 11.8 3.2 -19.0 3.4 -1.6 0.4
NCL -5.8 4.3 16.7 4.5 -12.4 6.4 -1.9 0.4
REMARKS:
FOR THE FILE mit0922g.snx, THE A PRIORI COVARIANCE MATRIX WAS SCALED UPWARD
(ALL ELEMENTS) BY A FACTOR OF 0.05% PRIOR TO DECONSTRAINING.
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0927g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0927g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0927g.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 -23.8
MIT -24.5
NCL -27.7
--
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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