[IGSREPORT-4645] Wk 0943 G-SINEX Comparisons
AC
AC
Wed Feb 25 10:36:50 PST 1998
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IGS Electronic Report Wed Feb 25 10:36:50 PST 1998 Message Number 4645
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0943 G-SINEX Comparisons
Comparison of GNAAC Combined SINEX Solutions - Week 0943
(FEB 1, 1998 - FEB 7, 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:
mit0943g.snx at cddis.gsfc.nasa.gov
jpl0943g.snx at cddis.gsfc.nasa.gov
ncl0943g.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))
jpl0943g.snx: BISH .075 .002 -.001 .069 -.001 .002 .046 .000 .000
mit0943g.snx: BISH .078 .000 -.003 .074 -.003 -.001 .046 .000 .000
- Unresolvable (no log file)
jpl0943g.snx: ELAT .069 .000 .000 .068 .000 .000 -.011 .000 .000
mit0943g.snx: ELAT .078 .000 -.003 .074 -.003 -.001 -.011 .000 .000
- Unresolvable (no log file)
jpl0943g.snx: KATZ .069 .000 .000 .068 .000 .000 -.012 .000 .000
mit0943g.snx: KATZ .078 .000 -.003 .074 -.003 -.001 -.012 .000 .000
- Unresolvable (no log file)
jpl0943g.snx: KOUR .078 .000 .000 .096 .000 .000 .132 .000 .000
mit0943g.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.
jpl0943g.snx: MALI .078 .000 .000 .096 .000 .000 .222 .000 .000
mit0943g.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.
jpl0943g.snx: TELA .069 .000 .000 .068 .000 .000 .000 .000 .000
mit0943g.snx: TELA .078 .000 -.003 .074 -.003 -.001 .000 .000 .000
- Unresolvable (no log file)
jpl0943g.snx: WUHN .110 .000 .000 .128 .000 .000 2.320 .000 .000
mit0943g.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.
jpl0943g.snx: HARK .110 .000 .000 .128 .000 .000 9.754 .000 .000
jpl0943g.snx: HOFN .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0943g.snx: NICO .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0943g.snx: SELE .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0943g.snx: UPAD .078 .000 -.003 .074 -.003 -.001 1.962 .000 .000
jpl0943g.snx: ZECK .110 .000 .000 .128 .000 .000 .000 .000 .000
jpl0943g.snx: ZIMM .069 .000 .000 .068 .000 .000 .000 .000 .000
FILE ncl0943g.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 MAC1 MIT-NCL Lat KERG MIT-NCL Lat CAS1 MIT-NCL
Lon COCO MIT-JPL Lon KERG MIT-JPL Lon NTUS MIT-JPL
Lon NTUS MIT-NCL Hgt IRKT JPL-NCL Hgt USUD MIT-JPL
Hgt COCO MIT-JPL Hgt FORT MIT-JPL Hgt USUD MIT-NCL
Hgt DGAR MIT-NCL
57 GLOBAL STATIONS:
ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU CHAT
CRO1 DAV1 DRAO EISL FAIR GOLD GRAZ GUAM HOB2 IISC
KELY KIRU KIT3 KOKB KOSG KWJ1 MADR MAS1 MATE MDO1
METS MKEA NLIB NRC1 OHIG ONSA PERT POL2 POTS RCM6
REYK SANT SHAO STJO TAEJ TAHI TIDB TSKB USNO 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:
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 1.5 1.6 0.7 8.3 7.9 8.1
Lon 2.0 1.9 1.2 8.3 7.6 7.3
Hgt 3.3 3.2 2.2 8.7 8.5 9.0
3D 4.1 4.1 2.6 14.7 13.9 14.2
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
------- ------- ------- ---------- ---------- ----------
0.169 0.452 0.318 1.827 1.350 1.480
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 -7.8 4.7 23.2 5.1 -3.6 6.3 -1.8 0.5
MIT -4.0 3.5 5.7 3.7 -13.8 4.5 -1.6 0.4
NCL -6.2 4.5 19.7 4.7 5.3 6.4 -1.7 0.4
REMARKS:
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0943g.snx :
Stations: HART TROM
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0943g.snx :
Stations: TROM YAR1
THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0943g.snx :
Stations: HART TROM YAR1
--
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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