[IGSREPORT-4570] Wk 0937 G-SINEX Comparisons
AC
AC
Tue Feb 3 11:21:50 PST 1998
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IGS Electronic Report Tue Feb 3 11:21:50 PST 1998 Message Number 4570
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0937 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0937
(DEC 21, 1997 - DEC 27, 1997)
Contacts: J. Kouba (kouba at geod.emr.ca)
D. Hutchison (hutch at geod.emr.ca)
R. Ferland (ferland 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:
mit0937g.snx at cddis.gsfc.nasa.gov
jpl0937g.snx at cddis.gsfc.nasa.gov
ncl0937g.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))
jpl0937g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0937g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0937g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0937g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0937g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0937g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0937g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0937g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0937g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0937g.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.
jpl0937g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0937g.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.
jpl0937g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0937g.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.
jpl0937g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0937g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0937g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0937g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
ncl0937g.snx: MDVO Antenna missing. .146 .000 .000
jpl0937g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0937g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0937g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0937g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0937g.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 ASC1 JPL-NCL Lat BRAZ JPL-NCL Lat FORT JPL-NCL
Lat KERG MIT-JPL Lon MATE MIT-JPL Lon FORT MIT-JPL
Lon OHIG MIT-NCL Hgt MCM4 MIT-JPL Hgt KERG MIT-JPL
Hgt FORT MIT-JPL Hgt YAR1 MIT-JPL Hgt KERG MIT-NCL
59 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ AUCK BAHR BOR1 BRMU CAS1 CHAT
COCO CRO1 DAV1 DGAR DRAO EISL FAIR GOLD HOB2 IISC
IRKT KELY KIRU KIT3 KOKB KOSG KWJ1 MAC1 MADR MAS1
MDO1 METS MKEA NLIB NRC1 NTUS ONSA PERT POL2 POTS
RCM6 REYK SHAO STJO TAEJ TAHI THU1 TIDB TSKB USNO
USUD VILL WES2 WHIT WSRT WTZR XIAN YELL ZWEN
9 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR TIDB WTZR YELL
AVERAGE COORDINATE RMS USING ITRF94:
59 GLOBAL STATIONS 9 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.2 1.2 1.6 7.5 7.1 7.0
Lon 2.5 1.8 1.7 9.4 7.9 8.4
Hgt 4.0 3.0 2.9 11.7 11.4 10.3
3D 4.9 3.7 3.7 16.8 15.6 15.0
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
59 GLOBAL STATIONS 9 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.156 0.979 0.563 2.340 1.723 1.574
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 -6.7 4.9 14.8 5.8 19.4 6.4 -2.2 0.5
MIT -4.4 3.0 7.7 3.7 7.3 3.5 -2.1 0.4
NCL -6.8 4.4 19.4 5.0 25.7 6.5 -2.1 0.5
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0937g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0937g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0937g.snx :
Stations: HART SANT 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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