Subject: [IGSREPORT-4677] Wk 0944 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Mon, 9 Mar 1998 7:17:58 PST

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IGS Electronic Report    Mon Mar  9  7:17:58 PST 1998      Message Number 4677
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0944 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0944   
(FEB 8, 1998 - FEB 14, 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:
   mit0944g.snx at cddis.gsfc.nasa.gov
   jpl0944g.snx at cddis.gsfc.nasa.gov
   ncl0944g.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))

jpl0944g.snx: BISH    .075   .002  -.001   .069  -.001   .002   .046   .000   .000
mit0944g.snx: BISH    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
   - Unresolvable (no log file)

jpl0944g.snx: ELAT    .069   .000   .000   .068   .000   .000  -.011   .000   .000
mit0944g.snx: ELAT    .078   .000  -.003   .074  -.003  -.001  -.011   .000   .000
   - Unresolvable (no log file)

jpl0944g.snx: KOUR    .078   .000   .000   .096   .000   .000   .132   .000   .000
mit0944g.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.

jpl0944g.snx: MALI    .078   .000   .000   .096   .000   .000   .222   .000   .000
mit0944g.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.

jpl0944g.snx: TELA    .069   .000   .000   .068   .000   .000   .000   .000   .000
mit0944g.snx: TELA    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
   - Unresolvable (no log file)

jpl0944g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000
mit0944g.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.

jpl0944g.snx: YAR1    .078   .000   .000   .096   .000   .000   .073   .000   .000
mit0944g.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.

jpl0944g.snx: HARK    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0944g.snx: HOFN    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0944g.snx: HRAO    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0944g.snx: MOIN    .110   .000   .000   .128   .000   .000   .994   .000   .000
jpl0944g.snx: NICO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0944g.snx: UPAD    .078   .000  -.003   .074  -.003  -.001  1.962   .000   .000
jpl0944g.snx: ZECK    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0944g.snx: ZIMM    .069   .000   .000   .068   .000   .000   .000   .000   .000

FILE ncl0944g.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 DAV1 MIT-JPL   Lat CAS1 MIT-JPL   Lat TAEJ MIT-JPL
   Lon ZWEN MIT-JPL   Lon MAC1 MIT-JPL   Lon NTUS MIT-JPL
   Hgt WSRT JPL-NCL   Hgt TAHI MIT-JPL   Hgt OHIG MIT-JPL
   Hgt TAHI MIT-NCL          

57 GLOBAL STATIONS:
   ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU BRUS
   CHAT CRO1 DGAR DRAO EISL FAIR FORT GOLD GRAZ GUAM
   HOB2 IISC IRKT KELY KERG KIRU KIT3 KOKB KOSG KWJ1
   LHAS MADR MAS1 MATE MDO1 METS MKEA NLIB NRC1 ONSA
   PERT POTS RCM6 REYK SANT SHAO STJO TIDB TSKB USNO
   USUD VILL WES2 WHIT WTZR YAR1 YELL   

11 FIDUCIAL STATIONS:
   ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YAR1
   YELL         

AVERAGE COORDINATE RMS USING ITRF94:

             57    GLOBAL  STATIONS         11   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        0.8       0.9       0.7        9.0        8.9        9.0 
Lon        2.1       1.2       1.3        8.7        7.8        7.9 
Hgt        3.2       2.6       2.0        8.6        8.5        8.8 
3D         3.9       3.0       2.5       15.2       14.5       14.9

VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):

        57    GLOBAL  STATIONS         11   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
   -------   -------   ------- ---------- ---------- ----------
     0.099     0.483     0.192      1.831      1.352      1.567

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     -11.7     4.6    26.8     4.5     1.0     6.7        -1.5      0.4
MIT     -10.4     3.1     5.2     3.2    -3.2     4.0        -1.3      0.4
NCL     -10.1     4.5    21.4     4.6     7.7     6.5        -1.3      0.4

REMARKS:

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0944g.snx :
   Stations: HART TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0944g.snx :
   Stations: TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0944g.snx :
   Stations: HART TROM

-- 
David Hutchison
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: [email-masked]

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