[IGSREPORT-4580] Wk 0938 G-SINEX Comparisons
AC
AC
Thu Feb 5 13:37:15 PST 1998
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IGS Electronic Report Thu Feb 5 13:37:15 PST 1998 Message Number 4580
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0938 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0938
(DEC 28, 1997 - JAN 3, 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:
mit0938g.snx at cddis.gsfc.nasa.gov
jpl0938g.snx at cddis.gsfc.nasa.gov
ncl0938g.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))
jpl0938g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0938g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0938g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0938g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0938g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0938g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0938g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0938g.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.
jpl0938g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0938g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0938g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0938g.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.
jpl0938g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0938g.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.
jpl0938g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
mit0938g.snx: GODE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0938g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0938g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0938g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0938g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0938g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0938g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0938g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0938g.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 MAS1 MIT-JPL Lat KERG MIT-JPL Lat MAS1 MIT-NCL
Lat KERG MIT-NCL Lat ASC1 MIT-NCL Lon BRMU JPL-NCL
Lon KERG JPL-NCL Lon FORT JPL-NCL Lon COCO MIT-JPL
Hgt MCM4 MIT-JPL Hgt FORT MIT-JPL Hgt THU1 MIT-NCL
Hgt SANT MIT-NCL Hgt FORT MIT-NCL
52 GLOBAL STATIONS:
ALBH ALGO AREQ BAHR CAS1 CHAT CRO1 DAV1 DGAR DRAO
EISL FAIR GOLD HOB2 IISC IRKT KIRU KIT3 KOKB KOSG
MAC1 MADR MATE MDO1 METS MKEA NLIB NRC1 NTUS OHIG
ONSA PERT POL2 POTS RCM6 REYK SHAO STJO TAEJ TAHI
TIDB TSKB USUD VILL WES2 WHIT WSRT WTZR XIAN YAR1
YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS USING ITRF94:
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 1.8 2.0 1.0 9.0 9.5 9.4
Lon 2.0 1.7 1.5 11.1 10.6 10.8
Hgt 2.9 3.2 3.1 15.8 15.2 14.8
3D 3.9 4.2 3.6 21.3 20.7 20.6
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
52 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.228 0.652 0.386 4.061 3.300 3.133
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 -11.0 4.3 28.4 4.5 20.7 6.4 -1.9 0.4
MIT -9.0 3.0 8.1 3.2 13.6 3.7 -1.7 0.4
NCL -9.8 4.8 21.4 5.0 18.5 6.6 -2.0 0.4
REMARKS:
FOR THE FILE mit0938g.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 mit0938g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0938g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0938g.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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