Subject: [IGSREPORT-3635] G-SNX Report for GPS Wk 896
From: AC Coordinator / NRCan GSDivision
Date: Sun, 13 Apr 1997 10:51:53 PDT

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IGS Electronic Report    Sun Apr 13 10:51:53 PDT 1997      Message Number 3635
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Author: AC Coordinator / NRCan GSDivision
Subject: G-SNX Report for GPS Wk 896

Subject: Wk 0896 G-SNX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0896   
(MAR 9, 1997 - MAR 15, 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:
   mit0896g.snx at cddis.gsfc.nasa.gov
   jpl0896g.snx at cddis.gsfc.nasa.gov
   ncl0896g.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))

jpl0896g.snx: ANKR    .110   .000   .000   .128   .000   .000   .000   .000   .000
mit0896g.snx: ANKR    .110   .000   .000   .128   .000   .000   .060   .000   .000
ncl0896g.snx: ANKR    .110   .000   .000   .128   .000   .000   .060   .000   .000
jpl0896g.snx: BAHR    .000   .000   .000   .000   .000   .000  3.122   .000   .000
mit0896g.snx: BAHR    .110   .000   .000   .128   .000   .000  3.122   .000   .000
ncl0896g.snx: BAHR    .110   .000   .000   .128   .000   .000  3.122   .000   .000
jpl0896g.snx: DRAO    .110   .000   .000   .128   .000   .000   .000   .000   .000
mit0896g.snx: DRAO    .110   .000   .000   .128   .000   .000   .100   .000   .000
ncl0896g.snx: DRAO    .110   .000   .000   .128   .000   .000   .100   .000   .000
jpl0896g.snx: GOPE    .070   .000   .000   .068   .000   .000   .046   .000   .000
mit0896g.snx: GOPE    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
jpl0896g.snx: JOZE    .070   .000   .000   .068   .000   .000   .198   .000   .000
mit0896g.snx: JOZE    .078   .000  -.003   .074  -.003  -.001   .198   .000   .000
jpl0896g.snx: MOIN    .110   .000   .000   .128   .000   .000  -.103   .000   .000
mit0896g.snx: MOIN    .110   .000   .000   .128   .000   .000   .994   .000   .000
jpl0896g.snx: MONP    .000   .000   .000   .000   .000   .000   .119   .000   .000
mit0896g.snx: MONP    .110   .000   .000   .128   .000   .000   .119   .000   .000
jpl0896g.snx: TAEJ    .000   .000   .000   .000   .000   .000   .660   .000   .000
mit0896g.snx: TAEJ    .075   .002  -.001   .069  -.001   .002   .660   .000   .000
ncl0896g.snx: TAEJ    .078   .000  -.003   .074  -.003  -.001   .660   .000   .000
jpl0896g.snx: UPAD    .070   .000   .000   .068   .000   .000  1.962   .000   .000
mit0896g.snx: UPAD    .078   .000  -.003   .074  -.003  -.001  1.962   .000   .000
jpl0896g.snx: UPO1    .110   .000   .000   .128   .000   .000   .078   .000   .000
mit0896g.snx: UPO1    .092  -.001   .000   .060   .000  -.001   .000   .000   .000
jpl0896g.snx: USUD    .078   .000   .000   .096   .000   .000  -.035   .000   .000
mit0896g.snx: USUD    .078   .000   .000   .096   .000   .000  -.035   .000   .000
ncl0896g.snx: USUD    .110   .000   .000   .128   .000   .000  -.035   .000   .000
jpl0896g.snx: ZIMM    .070   .000   .000   .068   .000   .000   .000   .000   .000
mit0896g.snx: ZIMM    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000

ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0896g.snx                             
   MDVO Multiple Sites
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: MDVO 
 
ANTENNA PHASE CENTRE CONFLICTS IN FILE ncl0896g.snx                             
   ASC1 Missing Antenna      
   AUCK Missing Antenna      
   CHAT Missing Antenna      
   DGAR Missing Antenna      
   KIRU Missing Antenna      
   KWJ1 Missing Antenna      
   MKEA Missing Antenna      
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: ASC1 AUCK CHAT DGAR KIRU KWJ1 MKEA 

CONFIDENCE  LEVEL  FOR OUTLIER DETECTION: 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat KIT3 MIT-JPL   Lat CAS1 MIT-JPL   Lon DAV1 JPL-NCL
   Lon SANT MIT-JPL   Lon CRO1 MIT-JPL   Lon OHIG MIT-JPL
   Lon OHIG MIT-NCL   Hgt CRO1 JPL-NCL   Hgt FORT JPL-NCL
   Hgt IRKT JPL-NCL   Hgt IRKT MIT-JPL   Hgt EISL MIT-JPL
   Hgt CRO1 MIT-JPL          

42 GLOBAL STATIONS:
   ALBH ALGO BOR1 BRAZ BRMU BRUS COCO FAIR FLIN GOLD
   GUAM HART HOB2 KELY KERG KOKB KOSG LHAS MAC1 MADR
   MALI MATE MCM4 MDO1 METS NYAL ONSA PAMA PERT POTS
   RCM6 REYK SHAO STJO TAIW TIDB TSKB WES2 WTZR YAR1
   YELL ZWEN        

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

AVERAGE COORDINATE RMS:

             42    GLOBAL  STATIONS         11   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.4       1.3       0.7        7.3        7.7        7.6 
Lon        1.5       1.4       1.4       13.8       14.4       13.9 
Hgt        4.1       4.2       2.9        9.4        9.0        9.2 
3D         4.6       4.7       3.3       18.3       18.7       18.3

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

        42    GLOBAL  STATIONS         11   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
   -------   -------   ------- ---------- ---------- ----------
     0.210     0.612     0.307      1.089      1.018      1.066

OFFSETS AND SCALE FACTOR WRT ITRF94 (FIDUCIAL STATIONS):

      Tx (mm) STD(mm) Ty (mm) STD(mm) Tz (mm) STD(mm) Scale (ppb) STD(ppb)
      ------- ------- ------- ------- ------- ------- ----------- --------
JPL      -4.1     5.1    13.8     5.3   -11.1     6.7        -3.1      0.6
MIT      -1.2     4.4    14.1     4.5    -2.3     5.3        -2.5      0.6
NCL       0.3     4.9     9.6     5.0    -6.7     6.1        -2.6      0.6

REMARKS:

THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM mit0896g.snx :
   Stations: TROM

THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM jpl0896g.snx :
   Stations: TROM

THE FOLLOWING FIDUCIAL STATIONS ARE MISSING FROM ncl0896g.snx :
   Stations: TROM

LONGITUDE RMS AT 11 FIDUCIAL STATIONS HIGHER THAN USUAL. FOLLOWING
STATIONS HAVE LONGITUDE DIFFERENCES WITH ITRF94 IN EXCESS OF 2 CM.:
   Stations: MADR KOSG

STATION / GNAAC / LONGITUDE DIFFERENCE (mm.):
   MADR JPL -32.4
	MIT -29.8
	NCL -29.3

   KOSG JPL  20.6
	MIT  20.1
	NCL  20.2

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

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