[IGSREPORT-4677] Wk 0944 G-SINEX Comparisons
AC
AC
Mon Mar 9 07:17:58 PST 1998
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IGS Electronic Report Mon Mar 9 7:17:58 PST 1998 Message Number 4677
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0944 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0944
(FEB 8, 1998 - FEB 14, 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:
mit0944g.snx at cddis.gsfc.nasa.gov
jpl0944g.snx at cddis.gsfc.nasa.gov
ncl0944g.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))
jpl0944g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0944g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0944g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0944g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0944g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0944g.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.
jpl0944g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0944g.snx: MALI .078 .000 .000 .096 .000 .000 .135 .000 .000
- Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.135 M.
jpl0944g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0944g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0944g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0944g.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.
jpl0944g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0944g.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.
jpl0944g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0944g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0944g.snx: HRAO .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0944g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0944g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0944g.snx: UPAD .078 .000 -.003 .074 -.003 -.001 1.962 .000 .000
jpl0944g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0944g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0944g.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 DAV1 MIT-JPL Lat CAS1 MIT-JPL Lat TAEJ MIT-JPL
Lon ZWEN MIT-JPL Lon MAC1 MIT-JPL Lon NTUS MIT-JPL
Hgt WSRT JPL-NCL Hgt TAHI MIT-JPL Hgt OHIG MIT-JPL
Hgt TAHI MIT-NCL
57 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU BRUS
CHAT CRO1 DGAR DRAO EISL FAIR FORT GOLD GRAZ GUAM
HOB2 IISC IRKT KELY KERG KIRU KIT3 KOKB KOSG KWJ1
LHAS MADR MAS1 MATE MDO1 METS MKEA NLIB NRC1 ONSA
PERT POTS RCM6 REYK SANT SHAO STJO TIDB TSKB USNO
USUD VILL WES2 WHIT WTZR YAR1 YELL
11 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YAR1
YELL
AVERAGE COORDINATE RMS USING ITRF94:
57 GLOBAL STATIONS 11 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 0.8 0.9 0.7 9.0 8.9 9.0
Lon 2.1 1.2 1.3 8.7 7.8 7.9
Hgt 3.2 2.6 2.0 8.6 8.5 8.8
3D 3.9 3.0 2.5 15.2 14.5 14.9
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
57 GLOBAL STATIONS 11 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.099 0.483 0.192 1.831 1.352 1.567
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 -11.7 4.6 26.8 4.5 1.0 6.7 -1.5 0.4
MIT -10.4 3.1 5.2 3.2 -3.2 4.0 -1.3 0.4
NCL -10.1 4.5 21.4 4.6 7.7 6.5 -1.3 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0944g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0944g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0944g.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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