[IGSREPORT-4678] Wk 0934 G-SINEX Comparisons
AC
AC
Mon Mar 9 09:08:33 PST 1998
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IGS Electronic Report Mon Mar 9 9:08:33 PST 1998 Message Number 4678
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0934 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0934
(NOV 30, 1997 - DEC 6, 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:
mit0934g.snx at cddis.gsfc.nasa.gov
jpl0934g.snx at cddis.gsfc.nasa.gov
ncl0934g.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))
jpl0934g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0934g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0934g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0934g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0934g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0934g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0934g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0934g.snx: KOUR .110 .000 .000 .128 .000 .000 .045 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.045 M.
jpl0934g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0934g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0934g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0934g.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.
jpl0934g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0934g.snx: YAR1 .110 .000 .000 .128 .000 .000 .081 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.081 M.
jpl0934g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0934g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0934g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0934g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
jpl0934g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0934g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0934g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0934g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0934g.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 OHIG JPL-NCL Lat OHIG MIT-JPL Lat KERG MIT-JPL
Lat KERG MIT-NCL Lat CAS1 MIT-NCL Lon KWJ1 MIT-NCL
Hgt BRAZ MIT-JPL Hgt MCM4 MIT-NCL Hgt BRAZ MIT-NCL
61 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU CHAT
COCO CRO1 DGAR DRAO EISL FAIR FORT GOLD GUAM HOB2
IISC IRKT KELY KIRU KIT3 KOKB KOSG KSTU MAC1 MADR
MAS1 MATE MDO1 METS MKEA NLIB NTUS ONSA PERT POL2
POTS RCM6 REYK SANT SHAO STJO TAEJ TAHI TAIW 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:
61 GLOBAL STATIONS 11 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.3 1.5 1.4 7.5 7.5 7.5
Lon 2.1 3.7 2.9 11.9 10.3 9.8
Hgt 3.4 4.2 2.9 11.0 11.5 11.5
3D 4.2 5.8 4.3 17.9 17.2 16.9
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
61 GLOBAL STATIONS 11 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.223 1.237 0.833 2.492 1.650 1.702
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 4.3 0.7 4.4 21.4 6.3 -1.4 0.4
MIT 3.1 2.6 -3.8 2.7 13.0 3.2 -1.1 0.3
NCL 4.4 4.6 10.7 4.7 13.1 8.9 -1.6 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0934g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0934g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0934g.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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