[IGSREPORT-4173] Wk 0919 G-SINEX Comparisons
AC
AC
Fri Sep 26 08:54:43 PDT 1997
******************************************************************************
IGS Electronic Report Fri Sep 26 8:54:43 PDT 1997 Message Number 4173
******************************************************************************
Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0919 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0919
(AUG 17, 1997 - AUG 23, 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:
mit0919g.snx at cddis.gsfc.nasa.gov
jpl0919g.snx at cddis.gsfc.nasa.gov
ncl0919g.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))
jpl0919g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0919g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
jpl0919g.snx: GOPE .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
mit0919g.snx: GOPE .070 .000 -.003 .068 -.003 -.001 .046 .000 .000
jpl0919g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
mit0919g.snx: HARK .110 .000 .000 .128 .000 .000 9.802 .000 .000
ncl0919g.snx: HARK .110 .000 .000 .128 .000 .000 9.803 .000 .000
jpl0919g.snx: HBRK .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0919g.snx: HBRK .110 .000 .000 .128 .000 .000 -.009 .000 .000
jpl0919g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .146 .000 .000
mit0919g.snx: MDVO .070 .002 -.001 .068 -.001 .002 .146 .000 .000
ncl0919g.snx: MDVO .078 .000 -.003 .074 -.003 -.001 .149 .000 .000
jpl0919g.snx: PLTC .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0919g.snx: PLTC .110 .000 .000 .128 .000 .000 1.791 .000 .000
jpl0919g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0919g.snx: SELE .110 .000 .000 .128 .000 .000 .089 .000 .000
jpl0919g.snx: SOFI .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0919g.snx: SOFI .110 .000 .000 .128 .000 .000 .219 .000 .000
jpl0919g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .660 .000 .000
mit0919g.snx: TAEJ .075 .002 -.001 .069 -.001 .002 .723 .000 .000
ncl0919g.snx: TAEJ .078 .000 -.003 .074 -.003 -.001 .660 .000 .000
jpl0919g.snx: USUD .110 .000 .000 .128 .000 .000 -.035 .000 .000
mit0919g.snx: USUD .078 .000 .000 .096 .000 .000 -.035 .000 .000
ncl0919g.snx: USUD .110 .000 .000 .128 .000 .000 -.035 .000 .000
jpl0919g.snx: WSMN .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0919g.snx: WSMN .110 .000 .000 .128 .000 .000 -.009 .000 .000
jpl0919g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0919g.snx: ZIMM .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0919g.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 CRO1 JPL-NCL Lon LHAS MIT-NCL Hgt CRO1 JPL-NCL
Hgt MCM4 JPL-NCL Hgt MCM4 MIT-JPL Hgt WUHN MIT-JPL
Hgt CRO1 MIT-NCL Hgt MCM4 MIT-NCL Hgt WUHN MIT-NCL
52 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ BAHR BOR1 BRAZ BRMU BRUS CAS1
COCO DAV1 DRAO FAIR FLIN FORT GOLD GUAM HOB2 IISC
IRKT KELY KERG KIT3 KOKB KOSG KOUR MAC1 MALI MATE
MDO1 METS NLIB NYAL ONSA PERT POTS RCM6 REYK SANT
SHAO STJO TAHI TAIW TIDB TSKB WES2 WHIT WTZR YAR1
YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS:
52 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.4 2.2 1.8 4.8 5.5 5.4
Lon 2.0 2.5 1.6 7.9 8.1 9.3
Hgt 5.3 5.0 2.2 9.2 10.1 9.0
3D 5.8 6.0 3.2 13.0 14.1 14.0
VARIANCE FACTORS (CHI-SQUARE / (DEGREES OF FREEDOM)):
52 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.177 1.279 0.433 1.295 1.262 1.066
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 -4.5 4.3 18.1 4.4 -30.6 6.1 -1.8 0.5
MIT -9.2 2.9 15.6 3.0 -28.8 3.5 -1.4 0.4
NCL 1.6 4.6 25.2 4.8 -18.9 6.8 -1.7 0.5
REMARKS:
FOR THE FILE mit0919g.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 mit0919g.snx :
Stations: HART TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0919g.snx :
Stations: TROM
THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0919g.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 -32.3
MIT -31.2
NCL -34.5
--
David Hutchison
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: hutch at geod.emr.ca
[Mailed From: David Hutchison <hutch at geod.emr.ca>]
More information about the IGSREPORT
mailing list