[IGSREPORT-4581] Wk 0939 G-SINEX Comparisons
AC
AC
Thu Feb 5 13:38:16 PST 1998
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IGS Electronic Report Thu Feb 5 13:38:16 PST 1998 Message Number 4581
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0939 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0939
(JAN 4, 1998 - JAN 10, 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:
mit0939g.snx at cddis.gsfc.nasa.gov
jpl0939g.snx at cddis.gsfc.nasa.gov
ncl0939g.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))
jpl0939g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0939g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0939g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0939g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0939g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0939g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0939g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0939g.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.
jpl0939g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0939g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0939g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0939g.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.
jpl0939g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0939g.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.
jpl0939g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0939g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0939g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0939g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
jpl0939g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0939g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0939g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0939g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0939g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0939g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0939g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0939g.snx
KOUR Multiple Sites
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
Stations: KOUR
CONFIDENCE LEVEL FOR OUTLIER DETECTION (ITRF94): 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
Lat KIT3 MIT-JPL Lon EISL MIT-NCL Lon DGAR MIT-NCL
Hgt IRKT JPL-NCL Hgt IRKT MIT-JPL Hgt EISL MIT-NCL
61 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU BRUS
CAS1 CHAT COCO CRO1 DAV1 DRAO FAIR FORT GOLD GUAM
HOB2 IISC KERG KIRU KOKB KOSG KWJ1 MAC1 MADR MAS1
MATE MCM4 MDO1 METS MKEA NTUS OHIG ONSA PERT POL2
POTS RCM6 REYK SANT SHAO STJO TAEJ TAHI THU1 TIDB
TSKB USUD VILL WES2 WHIT WSRT WTZR XIAN 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 2.0 1.7 0.9 8.3 8.3 8.6
Lon 2.1 2.5 1.5 10.1 9.3 9.5
Hgt 2.8 2.8 2.7 13.2 13.5 13.0
3D 4.0 4.1 3.2 18.6 18.4 18.2
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
------- ------- ------- ---------- ---------- ----------
0.182 0.752 0.413 3.115 2.192 2.447
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 -10.7 4.1 21.9 4.2 11.5 5.9 -1.7 0.4
MIT -9.2 2.7 3.1 2.8 8.6 3.3 -1.8 0.3
NCL -11.4 4.3 16.5 4.4 9.0 6.2 -1.4 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0939g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0939g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0939g.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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