Subject: [IGSREPORT-4559] Wk 0930 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Mon, 2 Feb 1998 13:46:14 PST

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IGS Electronic Report    Mon Feb  2 13:46:14 PST 1998      Message Number 4559
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0930 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0930   
(NOV 2, 1997 - NOV 8, 1997)

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:
   mit0930g.snx at cddis.gsfc.nasa.gov
   jpl0930g.snx at cddis.gsfc.nasa.gov
   ncl0930g.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))

jpl0930g.snx: BISH    .075   .002  -.001   .069  -.001   .002   .046   .000   .000
mit0930g.snx: BISH    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
   - Unresolvable (no log file)

jpl0930g.snx: ELAT    .069   .000   .000   .068   .000   .000  -.011   .000   .000
mit0930g.snx: ELAT    .078   .000  -.003   .074  -.003  -.001  -.011   .000   .000
   - Unresolvable (no log file)

jpl0930g.snx: KATZ    .069   .000   .000   .068   .000   .000  -.012   .000   .000
mit0930g.snx: KATZ    .078   .000  -.003   .074  -.003  -.001  -.012   .000   .000
   - Unresolvable (no log file)

jpl0930g.snx: TELA    .069   .000   .000   .068   .000   .000   .000   .000   .000
mit0930g.snx: TELA    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
   - Unresolvable (no log file)

jpl0930g.snx: KOUR    .078   .000   .000   .096   .000   .000   .132   .000   .000
mit0930g.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.

jpl0930g.snx: MALI    .078   .000   .000   .096   .000   .000   .222   .000   .000
mit0930g.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.

jpl0930g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000
mit0930g.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.

jpl0930g.snx: YAR1    .078   .000   .000   .096   .000   .000   .073   .000   .000
mit0930g.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.

ncl0930g.snx: FORT    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0930g.snx: HARK    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0930g.snx: HOFN    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0930g.snx: LPGS    .110   .000   .000   .128   .000   .000   .000   .000   .000
ncl0930g.snx: MDVO    Antenna missing.                          .146   .000   .000
jpl0930g.snx: MOIN    .110   .000   .000   .128   .000   .000   .994   .000   .000
jpl0930g.snx: NICO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0930g.snx: SELE    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0930g.snx: ZECK    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0930g.snx: ZIMM    .069   .000   .000   .068   .000   .000   .000   .000   .000

FILE ncl0931g.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 OHIG MIT-JPL   Lat OHIG MIT-NCL   Lat KERG MIT-NCL
   Lon NTUS MIT-JPL   Lon BRAZ MIT-JPL   Lon NTUS MIT-NCL
   Lon BRAZ MIT-NCL   Lon OHIG MIT-NCL   Hgt MAS1 MIT-JPL
   Hgt MCM4 MIT-JPL   Hgt TAEJ MIT-JPL   Hgt MAS1 MIT-NCL
   Hgt TAEJ MIT-NCL          

57 GLOBAL STATIONS:
   ALBH ALGO ANKR AREQ ASC1 AUCK BAHR BOR1 BRMU BRUS
   CAS1 CHAT COCO CRO1 DGAR DRAO FAIR FLIN GOLD GUAM
   HOB2 IISC IRKT KELY KIRU KIT3 KOKB KOSG KSTU KWJ1
   LHAS MAC1 MATE MDO1 METS MKEA NLIB ONSA PERT POTS
   RCM6 REYK SANT SHAO STJO TAIW TIDB TSKB USUD VILL
   WES2 WHIT WSRT WTZR YAR1 YELL ZWEN   

10 FIDUCIAL STATIONS:
   ALGO FAIR GOLD KOKB KOSG SANT TIDB WTZR YAR1 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        1.3       1.7       0.8        7.4        7.7        7.5 
Lon        2.1       2.3       0.9       10.1        9.1        9.0 
Hgt        3.7       3.6       1.2       10.6        9.7        9.1 
3D         4.5       4.6       1.7       16.4       15.4       14.8

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
   -------   -------   ------- ---------- ---------- ----------
     0.044     1.038     0.575      2.076      1.550      1.375

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     -10.4     5.1     7.3     5.3   -11.7     6.6        -1.4      0.4
MIT     -10.0     2.9     3.0     3.0   -18.9     3.5        -0.9      0.4
NCL      -9.7     4.8    13.7     4.9   -11.6     7.0        -1.1      0.4

REMARKS:

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0930g.snx :
   Stations: HART TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0930g.snx :
   Stations: TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0930g.snx :
   Stations: HART TROM

MADR WAS NOT USED IN GLOBAL COMPARISON DUE TO LARGE COORDINATE DIFFERENCES
WITH ITRF94, DESCRIBED BELOW:

STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
   MADR JPL -26.1
        MIT -23.4
        NCL -27.2

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

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