Subject: [IGSREPORT-4645] Wk 0943 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Wed, 25 Feb 1998 10:36:50 PST

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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 ([email-masked])
          D. Hutchison([email-masked])

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: [email-masked]

[Mailed From: David Hutchison <[email-masked]>]