Subject: [IGSREPORT-5368] Wk 0973 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Wed, 30 Sep 1998 6:56:33 PDT

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IGS Electronic Report    Wed Sep 30  6:56:33 PDT 1998      Message Number 5368
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0973 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0973   
(AUG 30, 1998 - SEP 5, 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 
      30 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:
   mit0973g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   jpl0973g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   ncl0973g.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))

jpl0973g.snx: BARB    .000   .000   .000   .000   .000   .000   .000   .000   .000
mit0973g.snx: BARB    .110   .000   .000   .128   .000   .000   .000   .000   .000
ncl0973g.snx: BARB    .000   .000   .000   .000   .000   .000   .000   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

jpl0973g.snx: SUTH    .000   .000   .000   .000   .000   .000   .119   .000   .000
mit0973g.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.

jpl0973g.snx: HFLK    .078   .000   .000   .096   .000   .000   .000   .000   .000
ncl0973g.snx: HRAO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0973g.snx: MONP    .000   .000   .000   .000   .000   .000   .119   .000   .000

FILE ncl0973g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

 
ANTENNA PHASE CENTRE CONFLICTS IN FILE jpl0973g.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 mit0973g.snx                             
   GALA Multiple Sites
   IISC Multiple Sites
   NYAL Multiple Sites
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: GALA IISC NYAL 
 
COORDINATE DIFFERENCE THRESHOLD FOR STATION REJECTION: 30 mm.
(REFERS TO COORDINATE DIFFERENCE FROM ITRF96 AFTER 7-PARAMETER TRANSFORMATION)

THE FOLLOWING STATIONS WERE DELETED FROM NCL
DUE TO DIFFERENCES IN EXCESS OF 30 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt GUAM  -33.0 mm.
 Hgt HOB2  107.9 mm.

THE FOLLOWING STATIONS WERE DELETED FROM JPL
DUE TO DIFFERENCES IN EXCESS OF 30 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Lat DAV1  -56.5 mm.
 Lat KERG  -52.8 mm.
 Lat MALI  -46.4 mm.
 Lon OHIG  -37.5 mm.
 Hgt GUAM  -31.8 mm.
 Lon HOB2   30.7 mm.
 Lon TIDB   30.9 mm.
 Lon MAC1   46.4 mm.
 Hgt HOB2  126.9 mm.
 Lon HART  236.7 mm.*
 Lat HART  646.5 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 30 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt HOB2   69.2 mm.

CONFIDENCE  LEVEL  FOR OUTLIER DETECTION             : 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat SANT JPL-NCL   Lat YAR1 JPL-NCL   Lat PERT JPL-NCL
   Lat COCO JPL-NCL   Lat COCO MIT-JPL   Lat YAR1 MIT-JPL
   Lat MAW1 MIT-JPL   Lat PERT MIT-JPL   Lat KARR MIT-JPL
   Lat CEDU MIT-JPL   Lat DGAR MIT-JPL   Lat ALIC MIT-JPL
   Lat CAS1 MIT-JPL   Lat HARK MIT-JPL   Lat DARW MIT-JPL
   Lon NTUS JPL-NCL   Lon CHAT JPL-NCL   Lon MCM4 JPL-NCL
   Lon AUCK MIT-JPL   Lon CHAT MIT-JPL   Lon NTUS MIT-NCL
   Lon COCO MIT-NCL   Hgt COCO JPL-NCL   Hgt MDVO MIT-JPL
   Hgt NTUS JPL-NCL   Hgt COCO JPL-NCL   Hgt MDVO MIT-JPL
   Hgt CAGL MIT-JPL   Hgt COCO MIT-JPL   Hgt NTUS MIT-JPL
   Hgt COCO MIT-NCL          

119 GLOBAL STATIONS:
   ALBH ALGO AMCT AREQ ASC1 BAHR BAKO BOGO BOGT BOR1
   BRMU BRUS CASA CHUR CRO1 DAV1 DRAO DUBO EBRE EISL
   ELAT FAIR FLIN FORT GILB GLSV GODE GOL2 GOLD GOPE
   GRAS GRAZ HERS HOFN HOLB IRKT JOZE JPLM KABR KATZ
   KELY KERG KIRU KIT3 KOKB KOSG KOUR KWJ1 LAMA LHAS
   LPGS MAC1 MAD2 MADR MAG0 MALI MAS1 MATE MDO1 MEDI
   METS MKEA NANO NICO NLIB NOTO NOUM NRC1 NSSP OBER
   OHIG ONSA PENC PETR PIE1 POL2 POTS PRDS QUIN RAMO
   RCM6 REYK RICH RIOG SCH2 SELE SHAO SOL1 STJO SUWN
   TAEJ TELA THU1 TID2 TIDB TOUL TOW2 TRO1 TSKB UCLU
   UPAD URUM USNA USNO USUD VILL WES2 WHIT WILL WSLR
   WSRT WTZR WUHN XIAN YAKA YAKZ YELL ZECK ZIMM 

38 FIDUCIAL STATIONS:
   ALGO BRMU DAV1 DRAO FAIR FORT GODE GOLD GRAZ IRKT
   KERG KIT3 KOKB KOSG KOUR KWJ1 LHAS MAC1 MADR MALI
   MATE MDO1 NLIB OHIG ONSA PERT PIE1 POTS SANT SHAO
   THU1 TIDB TSKB VILL WES2 WTZR YAR1 YELL  

AVERAGE COORDINATE RMS USING ITRF96:

            119    GLOBAL  STATIONS         38   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF96 JPL-ITRF96 NCL-ITRF96
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.6       0.9       1.7        4.1        3.4        4.6 
Lon        2.2       0.8       2.6        6.0        4.2        6.3 
Hgt        3.1       3.4       3.5       10.8       11.1       10.7 
3D         4.1       3.6       4.7       13.0       12.4       13.2

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

       125    GLOBAL  STATIONS         38   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF96 JPL-ITRF96 NCL-ITRF96
   -------   -------   ------- ---------- ---------- ----------
     1.502     2.158     0.390      3.920      4.023      3.183

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       1.7     1.8   -20.9     1.9   -15.1     2.4         0.5      0.1
MIT      -0.6     1.9    -9.2     1.9   -23.2     2.4         0.1      0.1
NCL       1.9     2.4   -14.2     2.5   -14.5     3.3         0.0      0.1

REMARKS:

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM mit0973g.snx :
   Stations: BRAZ MASP TROM ZWEN

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM jpl0973g.snx :
   Stations: BRAZ TROM ZWEN

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM ncl0973g.snx :
   Stations: BRAZ HART MADR MASP NLIB TROM ZWEN

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              
              MDV1 A              
    12309M001        MDVO A       
    10317M003 NYA1 A NYAL B       
    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 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  GILB 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  GILB A  KABR A  ELAT A  TELA A  RAMO A

SITE/ID BLOCK IERS DOMES NOS. VS STATION CODE/PT FIELDS IN ABBREVIATED .ssc FILES:
 cod09737.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 emr09737.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 esa09737.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 gfz09737.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 jpl09737.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 ngs09737.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 sio09737.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
    12309M002 MDVO A        MDVO B        MDVO A        MDVO A
    40405S031 GOLD A GOLD A GOLD A GOL2 A GOL2 A GOLD B GOL2 A
    42202M005 AREQ A AREQ B AREQ B AREQ A AREQ A AREQ B AREQ 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
    40499S020 RICH A               RCM6 A        RCM6 A RCM6 A
    12353M001 YAKZ A                      YAKA A        YAKZ A
                                          YAKZ A        YAKA A
    22306M002 IISC A        IISC B IISC A IISC A IISC B IISC 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  GILB 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]>]