[IGSREPORT-4582] Wk 0940 G-SINEX Comparisons
AC
AC
Thu Feb 5 13:39:10 PST 1998
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IGS Electronic Report Thu Feb 5 13:39:10 PST 1998 Message Number 4582
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0940 G-SINEX Comparisons
Subject: Wk 0940 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0940
(JAN 11, 1998 - JAN 17, 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:
mit0940g.snx at cddis.gsfc.nasa.gov
jpl0940g.snx at cddis.gsfc.nasa.gov
ncl0940g.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))
jpl0940g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0940g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0940g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0940g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0940g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0940g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0940g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0940g.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.
jpl0940g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0940g.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.
jpl0940g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0940g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0940g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0940g.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.
jpl0940g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0940g.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.
jpl0940g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0940g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0940g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0940g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
ncl0940g.snx: MDVO Antenna missing .146 .000 .000
jpl0940g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0940g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0940g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0940g.snx: UPAD .078 .000 -.003 .074 -.003 -.001 1.962 .000 .000
jpl0940g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0940g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0940g.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 KERG MIT-JPL Lat EISL MIT-JPL Lat OHIG MIT-JPL
Lat DAV1 MIT-JPL Lat KERG MIT-NCL Lat DAV1 MIT-NCL
Lat CAS1 MIT-NCL Lon NTUS MIT-JPL Lon KERG MIT-JPL
Lon CAS1 MIT-JPL Lon COCO MIT-JPL Lon DGAR MIT-NCL
Hgt IRKT JPL-NCL Hgt USUD MIT-JPL Hgt TAHI MIT-JPL
Hgt MCM4 MIT-JPL Hgt USUD MIT-NCL Hgt ASC1 MIT-NCL
Hgt TAHI MIT-NCL Hgt IRKT MIT-NCL
55 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ AUCK BAHR BOR1 BRMU BRUS CHAT
CRO1 DRAO FAIR FORT GOLD GUAM HOB2 KELY KIRU KIT3
KOKB KOSG KWJ1 MAC1 MADR MAS1 MATE MDO1 METS MKEA
NLIB NRC1 ONSA PERT POL2 POTS RCM6 REYK SANT SHAO
STJO TAEJ THU1 TIDB TSKB USNO 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:
55 GLOBAL STATIONS 11 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.1 1.1 0.7 8.7 8.7 8.4
Lon 1.6 2.2 1.7 10.5 9.7 9.2
Hgt 2.7 2.7 1.9 10.7 11.1 10.5
3D 3.4 3.7 2.6 17.3 17.2 16.3
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
55 GLOBAL STATIONS 11 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.135 0.689 0.333 2.560 1.950 1.988
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 -8.5 4.2 32.3 4.2 28.6 6.0 -1.9 0.4
MIT -6.9 2.8 10.4 2.9 25.9 3.5 -1.8 0.3
NCL -8.7 4.3 29.5 4.4 22.5 6.3 -1.7 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0940g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0940g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0940g.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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