Subject: [IGSREPORT-4635] Wk 0942 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Tue, 24 Feb 1998 7:23:10 PST

******************************************************************************
IGS Electronic Report    Tue Feb 24  7:23:10 PST 1998      Message Number 4635
******************************************************************************

Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0942 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0942   
(JAN 25, 1998 - JAN 31, 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:
   mit0942g.snx at cddis.gsfc.nasa.gov
   jpl0942g.snx at cddis.gsfc.nasa.gov
   ncl0942g.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))

jpl0942g.snx: BISH    .075   .002  -.001   .069  -.001   .002   .046   .000   .000
mit0942g.snx: BISH    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
   - Unresolvable (no log file)

jpl0942g.snx: ELAT    .069   .000   .000   .068   .000   .000  -.011   .000   .000
mit0942g.snx: ELAT    .078   .000  -.003   .074  -.003  -.001  -.011   .000   .000
   - Unresolvable (no log file)

jpl0942g.snx: KATZ    .069   .000   .000   .068   .000   .000  -.012   .000   .000
mit0942g.snx: KATZ    .078   .000  -.003   .074  -.003  -.001  -.012   .000   .000
   - Unresolvable (no log file)

jpl0942g.snx: KOUR    .078   .000   .000   .096   .000   .000   .132   .000   .000
mit0942g.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.

jpl0942g.snx: MALI    .078   .000   .000   .096   .000   .000   .222   .000   .000
mit0942g.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.

jpl0942g.snx: TELA    .069   .000   .000   .068   .000   .000   .000   .000   .000
mit0942g.snx: TELA    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
   - Unresolvable (no log file)

jpl0942g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000
mit0942g.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.

jpl0942g.snx: HARK    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0942g.snx: HOFN    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0942g.snx: LPGS    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0942g.snx: MOIN    .110   .000   .000   .128   .000   .000   .994   .000   .000
jpl0942g.snx: NICO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0942g.snx: SELE    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0942g.snx: UPAD    .078   .000  -.003   .074  -.003  -.001  1.962   .000   .000
jpl0942g.snx: ZECK    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0942g.snx: ZIMM    .069   .000   .000   .068   .000   .000   .000   .000   .000

FILE ncl0942g.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 CAS1 MIT-JPL   Lat KERG MIT-JPL   Lat DAV1 MIT-JPL
   Lat MAC1 MIT-JPL   Lat CAS1 MIT-NCL   Lat MAC1 MIT-NCL
   Lat DAV1 MIT-NCL   Lon CHAT MIT-JPL   Lon AREQ MIT-JPL
   Lon NTUS MIT-JPL   Lon EISL MIT-JPL   Lon DAV1 MIT-NCL
   Lon AUCK MIT-NCL   Lon CHAT MIT-NCL   Lon EISL MIT-NCL
   Hgt DGAR MIT-JPL   Hgt USUD MIT-JPL   Hgt NTUS MIT-NCL
   Hgt KERG MIT-NCL          

56 GLOBAL STATIONS:
   ALBH ALGO ANKR ASC1 BAHR BOR1 BRAZ BRMU BRUS CRO1
   DRAO FAIR FORT GOL2 GOLD GRAZ GUAM HOB2 IISC IRKT
   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 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:

             56    GLOBAL  STATIONS         10   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.7       2.1       0.7        8.7        8.9        9.0 
Lon        2.3       2.3       1.2        9.0        8.1        8.0 
Hgt        4.0       4.9       2.7        9.4        7.1        7.7 
3D         4.9       5.8       3.0       15.7       13.9       14.3

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

        56    GLOBAL  STATIONS         10   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
   -------   -------   ------- ---------- ---------- ----------
     0.161     1.474     0.574      2.413      1.832      1.615

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      -5.2     6.5    18.9     6.4    27.3     7.5        -2.1      0.4
MIT      -9.6     2.8    -2.3     3.0    16.0     3.0        -1.9      0.4
NCL      -2.9     4.8    14.3     5.0    30.2     7.0        -2.0      0.5

REMARKS:

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0942g.snx :
   Stations: HART TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0942g.snx :
   Stations: TROM YAR1

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0942g.snx :
   Stations: HART TROM YAR1

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

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