Subject: [IGSREPORT-5372] Wk 0974 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Thu, 1 Oct 1998 11:15:31 PDT

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IGS Electronic Report    Thu Oct  1 11:15:31 PDT 1998      Message Number 5372
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0974 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0974   
(SEP 6, 1998 - SEP 12, 1998)

Contacts: J. Kouba ([email-masked])
          D. Hutchison ([email-masked])
          R. Ferland ([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 station  present  in  only one  GNAAC combined SINEX files was  de-
      leted  from all three combined solutions.  Every solution was then sub-
      jected to a 7-parameter transformation  into  a common reference system
      (the  positions  of  the ITRF96 RS47 station set expected at mid-week).  
      Station coordinates  with  ITRF96 transformation residuals in excess of 
      55 mm. from ITRF96 after transformation  were  excluded from subsequent 
      analysis of this combined solution,  and the 7-parameter transformation 
      was reapplied.

   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:
   mit0974g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   jpl0974g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   ncl0974g.snx at cddis.gsfc.nasa.gov or cddisa.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))

jpl0974g.snx: SUTH    .000   .000   .000   .000   .000   .000   .119   .000   .000
mit0974g.snx: SUTH    .000   .000   .000   .000   .000   .000   .119   .000   .000
   - Both wrong. Should be L1/L2 offset, eccentricity 0.110, 0.128, 0.119 M. respectively.

jpl0974g.snx: HFLK    .078   .000   .000   .096   .000   .000   .000   .000   .000
ncl0974g.snx: HRAO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0974g.snx: MONP    .000   .000   .000   .000   .000   .000   .119   .000   .000
mit0974g.snx: TROM    .078   .000   .000   .096   .000   .000  2.475   .000   .000

FILE ncl0974g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

 
ANTENNA PHASE CENTRE CONFLICTS IN FILE jpl0974g.snx
(MODEL / SER. NO. / L1 (UNE) / L2 (UNE))
(UNE = Up North East (metres))
   DORNE MARGOLIN B     -----    .078   .000   .000   .096   .000   .000
   DORNE MARGOLIN B     -----    .000   .000   .000   .000   .000   .000
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: NYAL 
 
ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0974g.snx
   GALA Multiple Sites
   IISC Multiple Sites
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: GALA IISC 
 
COORDINATE DIFFERENCE THRESHOLD FOR STATION REJECTION: 55 mm.
(REFERS TO COORDINATE DIFFERENCE FROM ITRF96 AFTER 7-PARAMETER TRANSFORMATION)

THE FOLLOWING STATIONS WERE DELETED FROM NCL
DUE TO DIFFERENCES IN EXCESS OF 55 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt HOB2   57.5 mm.

THE FOLLOWING STATIONS WERE DELETED FROM JPL
DUE TO DIFFERENCES IN EXCESS OF 55 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt HOB2  142.5 mm.
 Lon HART  240.0 mm.*
 Lat HART  650.8 mm.*

*Proper offset may not have been used:
 30302M002 to 30302M007 dx/dy/dz: -.145m.,  -.374m.,  -.623m.

THE FOLLOWING STATIONS WERE DELETED FROM MIT
DUE TO DIFFERENCES IN EXCESS OF 55 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt HOB2   66.0 mm.

CONFIDENCE  LEVEL  FOR OUTLIER DETECTION             : 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat DGAR JPL-NCL   Lat HARK MIT-JPL   Lat KERG MIT-JPL
   Lat DGAR MIT-JPL   Lat MALI MIT-JPL   Lat TIDB MIT-JPL
   Lat MAW1 MIT-JPL   Lat DAV1 MIT-JPL   Lon ALBH JPL-NCL
   Lon MALI JPL-NCL   Lon COCO JPL-NCL   Lon RIOG MIT-JPL
   Lon OHIG MIT-JPL   Lon MAS1 MIT-JPL   Lon BAKO MIT-JPL
   Lon ALBH MIT-JPL   Lon COCO MIT-JPL   Hgt GUAM JPL-NCL
   Hgt MDVO JPL-NCL   Hgt MDVO MIT-JPL   Hgt CAGL MIT-JPL
   Hgt GUAM MIT-JPL   Hgt DGAR MIT-JPL   Hgt COCO MIT-JPL
   Hgt KWJ1 MIT-JPL   Hgt CAS1 MIT-JPL   Hgt WUHN MIT-NCL

122 GLOBAL STATIONS:
   ALGO ALIC AMCT AREQ ASC1 AUCK BAHR BARB BOGO BOR1
   BRMU BRUS CASA CEDU CHAT CHUR CRO1 DARW DRAO DUBO
   EBRE EISL ELAT FAIR FORT GLSV GODE GOL2 GOLD GOPE
   GRAS GRAZ HERS HOFN HOLB IRKT JOZE JPLM KABR KARR
   KATZ KELY KIRU KIT3 KOKB KOSG KOUR KSTU LAMA LHAS
   LPGS MAC1 MAD2 MADR MAG0 MATE MCM4 MDO1 MEDI METS
   MKEA NANO NICO NLIB NOTO NOUM NRC1 NSSP NTUS NYA1
   NYAL OBER ONSA PENC PERT PETR PIE1 POL2 POTS PRDS
   QUIN RAMO RCM6 REYK RICH SANT SCH2 SELE SHAO SJDV
   SOL1 STJO SUWN TAEJ TELA THU1 TID2 TOUL TOW2 TRO1
   TSKB UCLU UPAD URUM USNA USNO USUD VILL WES2 WHIT
   WILL WSLR WSRT WTZR XIAN YAKA YAKZ YAR1 YELL ZECK
   ZIMM ZWEN        

43 FIDUCIAL STATIONS:
   ALGO AREQ BRMU DAV1 DRAO FAIR FORT GODE GOL2 GRAZ
   GUAM IRKT KERG KIT3 KOKB KOSG KOUR KWJ1 LHAS MAC1
   MAD2 MALI MAS1 MATE MDO1 NLIB NYAL OHIG ONSA PERT
   PIE1 POTS SANT SHAO THU1 TID2 TSKB VILL WES2 WTZR
   YAR1 YELL ZWEN       

AVERAGE COORDINATE RMS USING ITRF96:

            122    GLOBAL  STATIONS         43   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF96 JPL-ITRF96 NCL-ITRF96
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.2       0.6       1.1        4.1        4.7        4.4 
Lon        1.1       0.6       1.2        5.9        5.3        5.6 
Hgt        2.8       2.3       2.9       11.8       11.5       11.6 
3D         3.2       2.4       3.4       13.8       13.5       13.6

VARIANCE FACTORS WITH ITRF96 (CHI-SQUARE / (DEGREES OF FREEDOM)):

       131    GLOBAL  STATIONS         43   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF96 JPL-ITRF96 NCL-ITRF96
   -------   -------   ------- ---------- ---------- ----------
     0.369     0.552     0.175      3.435      3.135      2.452

OFFSETS AND SCALE FACTOR WRT ITRF96 (FIDUCIAL STATIONS):
(TRANSFORMATION FROM ITRF96 TO GNAAC SINEX FILES)

      Tx (mm) STD(mm) Ty (mm) STD(mm) Tz (mm) STD(mm) Scale (ppb) STD(ppb)
      ------- ------- ------- ------- ------- ------- ----------- --------
JPL      -1.9     2.1   -11.0     2.2   -15.9     2.9         0.3      0.1
MIT      -3.7     1.8    -3.2     1.8   -13.0     2.6        -0.3      0.1
NCL      -1.2     3.0    -4.8     3.1   -13.7     4.2         0.1      0.2

REMARKS:
 STATION NAME/POINT CODES CHANGED IN mit0974g.snx 
 ENFORCED FROM TEMPLATE FILE igs.snx at cddis.gsfc.nasa.gov.

    Old     New      IERS
Code/Pt Code/Pt  DOMES NO
------- -------  --------
NYAL  B NYA1  A 10317M003

      1 Change  in all.

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM mit0974g.snx :
   Stations: BRAZ

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM jpl0974g.snx :
   Stations: BRAZ

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM ncl0974g.snx :
   Stations: BRAZ HART MAD2

SITE/ID BLOCK IERS DOMES NOS. VS STATION CODE/PT FIELDS IN COMPARED GNAAC FILES:
(ENTRIES APPEAR ONLY WHERE GNAACS DIFFER.)

IERS DOMES NO    JPL    MIT    NCL
============= ====== ====== ======
    42202M005 AREQ A AREQ A AREQ A
              ARE1 A              
    42005M001 GALA A GALA A GALA A
              GAL1 A GALA B       
    40405S031 GOL2 A GOLD A GOL2 A
              GOLD A GOL2 A GOLD A
              GOL1 A              
    30302M007 HARK A HARK A HARK A
              HART A HART B       
              HAR1 A              
    22306M002 IISC A IISC A IISC A
              IIS1 A IISC B       
    13407S012 MAD2 A MAD2 A       
              MADR A MADR A       
    31303M002 MAS1 A        MAS1 A
              MASP A              
    31303M001        MAS1 A       
    12309M002 MDVO A        MDVO A
              MDV1 A              
    12309M001        MDVO A       
    10317M003 NYA1 A NYAL B NYA1 A
    40499S020 RCM6 A RCM6 A RCM6 A
              RICH A RICH A       
    50103M108 TID2 A TIDB A TID2 A
              TIDB A TID2 A TIDB A
    12353M001 YAKA A YAKA A       
              YAKZ A YAKZ A       
    50107M004 YAR1 A YAR1 A YAR1 A
              YAR2 A              
 
MISSING IERS DOMES NOS AT JPL:
-----------------------------
  ALIC A  BAKO A  DARW A  ELAT A  KABR A  KARR A  KATZ A  MAW1 A  RAMO A  RIOG A
  TELA A  TOW2 A  URUM A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  RIOG A  BAKO A  URUM A  KATZ A  KABR A  ELAT A  TELA A  RAMO A

SITE/ID BLOCK IERS DOMES NOS. VS STATION CODE/PT FIELDS IN ABBREVIATED .ssc FILES:
 cod09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 emr09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 esa09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 gfz09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 jpl09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 ngs09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 sio09747.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
(ENTRIES APPEAR ONLY WHERE ACS DIFFER.)

IERS DOMES NO    COD  NRCan    ESA    GFZ    JPL    NGS    SIO
============= ====== ====== ====== ====== ====== ====== ======
    30302M007 HART A HART B HART B HARK A HARK A HART B HARK A
    31303M002 MASP A MASP B MASP B MAS1 A MAS1 A MASP B MAS1 A
    42202M005 AREQ A AREQ B AREQ B AREQ A AREQ A AREQ B AREQ A
    12309M002 MDVO A        MDVO B        MDVO A        MDVO A
    12353M001 YAKZ A                      YAKA A        YAKZ A
    40405S031 GOLD A GOLD A GOLD A GOL2 A GOL2 A GOLD B GOL2 A
    50103M108 TIDB A TIDB A TIDB A TID2 A TID2 A TIDB A TID2 A
    50107M004 YAR1 A        YAR1 A YAR2 A YAR1 A YAR1 A YAR1 A
    22306M002 IISC A        IISC B IISC A IISC A IISC B IISC A
    40499S020 RICH A               RCM6 A        RCM6 A RCM6 A
    10302M006 TROM A               TRO1 A                     
    10317M003 NYAL A               NYA1 A NYA1 A              
    13407S012               MADR A        MAD2 A MADR A MAD2 A
    22601M001               NTUS A NTUS A NTUS A        NTUS A
    22601M002                                    NTUS A       
    42005M001                      GALA A GALA A GALA B GALA A
 
MISSING IERS DOMES NOS AT GFZ:
-----------------------------
  URUM A  RIOG A
 
MISSING IERS DOMES NOS AT SIO:
-----------------------------
  BAKO A  KATZ A  KABR A  ELAT A  TELA A  RAMO A

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

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