[IGSREPORT-4569] Wk 0936 G-SINEX Comparisons
AC
AC
Tue Feb 3 11:02:00 PST 1998
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IGS Electronic Report Tue Feb 3 11:02:00 PST 1998 Message Number 4569
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0936 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0936
(DEC 14, 1997 - DEC 20, 1997)
Contacts: J. Kouba (kouba at geod.emr.ca)
D. Hutchison (hutch at geod.emr.ca)
R. Ferland (ferland 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:
mit0936g.snx at cddis.gsfc.nasa.gov
jpl0936g.snx at cddis.gsfc.nasa.gov
ncl0936g.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))
jpl0936g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0936g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0936g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0936g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0936g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0936g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0936g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0936g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0936g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0936g.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.
jpl0936g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0936g.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.
jpl0936g.snx: YAR1 .078 .000 .000 .096 .000 .000 .073 .000 .000
mit0936g.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.
jpl0936g.snx: GALA .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0936g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0936g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0936g.snx: LPGS .110 .000 .000 .128 .000 .000 .000 .000 .000
ncl0936g.snx: MDVO Antenna missing. .146 .000 .000
jpl0936g.snx: MOIN .110 .000 .000 .128 .000 .000 .994 .000 .000
jpl0936g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0936g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0936g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0936g.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 KERG MIT-NCL Lon METS MIT-JPL
Lon BAHR MIT-JPL Lon OHIG MIT-NCL Hgt YAR1 JPL-NCL
Hgt MCM4 MIT-JPL Hgt YAR1 MIT-JPL
63 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BOR1 BRAZ BRMU BRUS
CAS1 CHAT COCO CRO1 DGAR DRAO EISL FAIR FORT GOLD
GUAM HOB2 IISC IRKT KELY KIRU KIT3 KOKB KOSG KWJ1
MAC1 MADR MAS1 MATE MDO1 MKEA NLIB NRC1 NTUS ONSA
PERT POL2 POTS RCM6 REYK SANT SHAO STJO TAEJ TAHI
THU1 TIDB TSKB USNO USUD VILL WES2 WHIT WSRT WTZR
XIAN YELL ZWEN
10 FIDUCIAL STATIONS:
ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YELL
AVERAGE COORDINATE RMS USING ITRF94:
63 GLOBAL STATIONS 10 FIDUCIAL STATIONS
MIT-JPL MIT-NCL JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
(mm) (mm) (mm) (mm) (mm) (mm)
------- ------- ------- ---------- ---------- ----------
Lat 1.9 1.3 1.9 6.9 7.2 7.2
Lon 2.5 1.6 1.9 8.0 7.0 7.3
Hgt 4.9 3.3 3.5 9.8 11.0 9.2
3D 5.8 3.9 4.4 14.4 14.9 13.8
VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):
63 GLOBAL STATIONS 10 FIDUCIAL STATIONS
JPL-NCL MIT-JPL MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
------- ------- ------- ---------- ---------- ----------
0.146 1.368 0.575 1.778 1.450 1.374
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 -7.1 4.1 8.3 4.4 3.6 6.1 -1.9 0.4
MIT -4.4 2.8 3.3 3.1 -5.7 3.3 -1.9 0.4
NCL -6.8 4.2 12.4 4.4 11.5 6.1 -1.8 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0936g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0936g.snx :
Stations: TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0936g.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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