[IGSREPORT-4634] Wk 0941 G-SINEX Comparisons
AC
AC
Tue Feb 24 07:19:49 PST 1998
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IGS Electronic Report Tue Feb 24 7:19:49 PST 1998 Message Number 4634
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0941 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0941
(JAN 18, 1998 - JAN 24, 1998)
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:
mit0941g.snx at cddis.gsfc.nasa.gov
jpl0941g.snx at cddis.gsfc.nasa.gov
ncl0941g.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))
jpl0941g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0941g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0941g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0941g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0941g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0941g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0941g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0941g.snx: KOUR .078 .000 .000 .096 .000 .000 .045 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.045 M.
jpl0941g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0941g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0941g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0941g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 2.355 M.
jpl0941g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0941g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.081 M.
jpl0941g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0941g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0941g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0941g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0941g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
ncl0941g.snx: MDVO Antenna Missing .146 .000 .000
jpl0941g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0941g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0941g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0941g.snx: UPAD .078 .000 -.003 .074 -.003 -.001 1.962 .000 .000
jpl0941g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0941g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0941g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.
CONFIDENCE LEVEL FOR OUTLIER DETECTION (ITRF94): 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat KERG MIT-JPL Lat DAV1 MIT-JPL Lat KERG MIT-NCL
Lat DAV1 MIT-NCL Lon GUAM MIT-JPL Lon MCM4 MIT-JPL
Lon KERG MIT-JPL Lon COCO MIT-JPL Hgt EISL JPL-NCL
Hgt DGAR MIT-JPL Hgt GUAM MIT-JPL Hgt FORT MIT-JPL
Hgt EISL MIT-JPL Hgt DGAR MIT-NCL
59 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRAZ BRMU
BRUS CAS1 CHAT CRO1 DRAO FAIR GOLD GRAZ HOB2 IISC
IRKT KELY KIRU KIT3 KOKB KOSG KWJ1 MAC1 MADR MAS1
MATE MDO1 METS MKEA NLIB NRC1 NTUS OHIG ONSA PERT
POTS RCM6 REYK SANT STJO TAEJ TAHI THU1 TIDB TSKB
USUD VILL WES2 WHIT WSRT WTZR YAR1 YELL ZWEN
11 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YAR1
YELL
AVERAGE COORDINATE RMS USING ITRF94:
59 GLOBAL STATIONS 11 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.5 2.0 1.1 8.3 8.0 8.4
Lon 2.8 2.0 1.6 8.7 8.5 8.6
Hgt 2.4 3.0 2.0 7.5 6.9 7.9
3D 4.0 4.1 2.8 14.2 13.6 14.4
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
59 GLOBAL STATIONS 11 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.104 0.866 0.460 1.684 1.301 1.337
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 -10.5 4.6 28.3 4.6 16.7 6.9 -1.4 0.4
MIT -10.6 2.6 3.2 2.7 10.9 3.0 -1.5 0.3
NCL -8.5 4.8 24.8 4.9 15.5 7.1 -1.3 0.4
REMARKS:
FOR THE FILE mit0941g.snx, THE A PRIORI COVARIANCE MATRIX WAS SCALED UPWARD
(ALL ELEMENTS) BY A FACTOR OF 0.05% PRIOR TO DECONSTRAINING.
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0941g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0941g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0941g.snx :
Stations: HART TROM
--
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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