[IGSREPORT-4559] Wk 0930 G-SINEX Comparisons
AC
AC
Mon Feb 2 13:46:14 PST 1998
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IGS Electronic Report Mon Feb 2 13:46:14 PST 1998 Message Number 4559
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0930 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0930
(NOV 2, 1997 - NOV 8, 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:
mit0930g.snx at cddis.gsfc.nasa.gov
jpl0930g.snx at cddis.gsfc.nasa.gov
ncl0930g.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))
jpl0930g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0930g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0930g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0930g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0930g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0930g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0930g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0930g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0930g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0930g.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.
jpl0930g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0930g.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.
jpl0930g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0930g.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.
jpl0930g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0930g.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.
ncl0930g.snx: FORT .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0930g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0930g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0930g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
ncl0930g.snx: MDVO Antenna missing. .146 .000 .000
jpl0930g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0930g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0930g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0930g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0930g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0931g.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 MIT-JPL Lat OHIG MIT-NCL Lat KERG MIT-NCL
Lon NTUS MIT-JPL Lon BRAZ MIT-JPL Lon NTUS MIT-NCL
Lon BRAZ MIT-NCL Lon OHIG MIT-NCL Hgt MAS1 MIT-JPL
Hgt MCM4 MIT-JPL Hgt TAEJ MIT-JPL Hgt MAS1 MIT-NCL
Hgt TAEJ MIT-NCL
57 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU BRUS
CAS1 CHAT COCO CRO1 DGAR DRAO FAIR FLIN GOLD GUAM
HOB2 IISC IRKT KELY KIRU KIT3 KOKB KOSG KSTU KWJ1
LHAS MAC1 MATE MDO1 METS MKEA NLIB ONSA PERT POTS
RCM6 REYK SANT SHAO STJO TAIW TIDB TSKB USUD VILL
WES2 WHIT WSRT WTZR YAR1 YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 YELL
AVERAGE COORDINATE RMS USING ITRF94:
57 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.3 1.7 0.8 7.4 7.7 7.5
Lon 2.1 2.3 0.9 10.1 9.1 9.0
Hgt 3.7 3.6 1.2 10.6 9.7 9.1
3D 4.5 4.6 1.7 16.4 15.4 14.8
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
57 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.044 1.038 0.575 2.076 1.550 1.375
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 -10.4 5.1 7.3 5.3 -11.7 6.6 -1.4 0.4
MIT -10.0 2.9 3.0 3.0 -18.9 3.5 -0.9 0.4
NCL -9.7 4.8 13.7 4.9 -11.6 7.0 -1.1 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0930g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0930g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0930g.snx :
Stations: HART TROM
MADR WAS NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:
STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
MADR JPL -26.1
MIT -23.4
NCL -27.2
--
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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