Subject: [IGSREPORT-5367] Wk 0972 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Wed, 30 Sep 1998 6:55:30 PDT

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IGS Electronic Report    Wed Sep 30  6:55:30 PDT 1998      Message Number 5367
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0972 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0972   
(AUG 23, 1998 - AUG 29, 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 
      ZZ 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:
   jpl0972g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   mit0972g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   ncl0972g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov

GNAACs: JPL MIT NCL

STATIONS WITH INCONSISTENT ANTENNA ECCENTRICITY INFORMATION:
(FILE: / STATION / L1 (UNE) / L2 (UNE) / ECCENTRICITY (UNE))
(UNE = Up North East (metres))

jpl0972g.snx: HFLK    .078   .000   .000   .096   .000   .000   .000   .000   .000
ncl0972g.snx: HRAO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0972g.snx: MONP    .000   .000   .000   .000   .000   .000   .119   .000   .000
mit0972g.snx: TROM    .078   .000   .000   .096   .000   .000  2.475   .000   .000

FILE ncl0972g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

 
ANTENNA PHASE CENTRE CONFLICTS IN FILE jpl0972g.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 mit0972g.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: 30 mm.
(REFERS TO COORDINATE DIFFERENCE FROM ITRF96 AFTER 7-PARAMETER TRANSFORMATION)

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  -56.8 mm.
 Lat KERG  -52.1 mm.
 Lat MALI  -42.0 mm.
 Lon OHIG  -36.2 mm.
 Lon TIDB   32.4 mm.
 Lon HOB2   36.0 mm.
 Lon MAC1   49.6 mm.
 Hgt HOB2  102.3 mm.
 Lon HART  240.6 mm.*
 Lat HART  646.0 mm.*

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

THE FOLLOWING STATIONS WERE DELETED FROM NCL
DUE TO DIFFERENCES IN EXCESS OF 30 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt HOB2   76.9 mm.

CONFIDENCE  LEVEL  FOR OUTLIER DETECTION             : 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat DGAR JPL-MIT   Lat NTUS JPL-MIT   Lat TOW2 JPL-MIT
   Lat DARW JPL-MIT   Lat ALIC JPL-MIT   Lat CEDU JPL-MIT
   Lat KARR JPL-MIT   Lat COCO JPL-MIT   Lat YAR1 JPL-MIT
   Lat PERT JPL-MIT   Lat MAW1 JPL-MIT   Lat CAS1 JPL-MIT
   Lat PERT JPL-NCL   Lat CAS1 JPL-NCL   Lon THTI JPL-MIT
   Lon NTUS JPL-MIT   Lon MCM4 JPL-MIT   Lon AUCK JPL-MIT
   Lon DARW JPL-MIT   Lon NOUM JPL-MIT   Lon CHAT JPL-MIT
   Lon COCO JPL-MIT   Lon NTUS JPL-NCL   Lon MCM4 JPL-NCL
   Lon THTI JPL-NCL   Hgt MDVO JPL-MIT   Hgt MDVO MIT-NCL
   Hgt THTI JPL-MIT   Hgt NTUS JPL-MIT   Hgt COCO JPL-MIT
   Hgt MDVO JPL-MIT   Hgt MDVO MIT-NCL   Hgt COCO MIT-NCL

125 GLOBAL STATIONS:
   ALBH ALGO AMCT ANKR AOML AREQ ASC1 BAHR BAKO BOGO
   BOGT BOR1 BRMU BRUS CAGL CASA CHUR CRO1 DAV1 DRAO
   DUBO EBRE EISL ELAT FAIR FLIN FORT GILB GLSV GODE
   GOL2 GOLD GOPE GRAS GRAZ GUAM HARK HERS HOFN HOLB
   IRKT JOZE JPLM KABR KATZ KELY KERG KIRU KIT3 KOKB
   KOSG KOUR KSTU KWJ1 LAMA LHAS LPGS MAC1 MAD2 MADR
   MAG0 MALI MAS1 MATE MDO1 MEDI METS MKEA NANO NICO
   NLIB NOTO NRC1 NYA1 OBER OHIG ONSA PENC PETR PIE1
   POL2 POTS PRDS QUIN RAMO RCM6 REYK RIOG SANT SCH2
   SELE SHAO SJDV SOL1 STJO SUWN TAEJ TELA THU1 TID2
   TIDB TOUL TRO1 TSKB UCLU UPAD URUM USNA USNO USUD
   VILL WES2 WHIT WILL WSLR WSRT WTZR WUHN XIAN YAKA
   YAKZ YELL ZECK ZIMM ZWEN     

40 FIDUCIAL STATIONS:
   ALGO BRMU DAV1 DRAO FAIR FORT GODE GOLD GRAZ GUAM
   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 ZWEN

AVERAGE COORDINATE RMS USING ITRF96:

            125    GLOBAL  STATIONS         40   FIDUCIAL   STATIONS
        JPL-MIT   JPL-NCL   MIT-NCL JPL-ITRF96 MIT-ITRF96 NCL-ITRF96
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.2       1.4       1.0        3.8        4.2        4.8 
Lon        1.3       1.3       0.9        4.8        6.1        6.4 
Hgt        2.8       2.4       3.0       10.7       10.7       10.2 
3D         3.3       3.1       3.3       12.3       13.0       13.0

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

       134    GLOBAL  STATIONS         40   FIDUCIAL   STATIONS
   JPL-MIT   JPL-NCL   MIT-NCL JPL-ITRF96 MIT-ITRF96 NCL-ITRF96
   -------   -------   ------- ---------- ---------- ----------
     0.448     0.281     0.214      3.154      3.685      2.903

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       6.1     2.4   -13.9     2.5   -16.6     3.3         0.3      0.2
MIT       3.6     2.0    -3.6     2.0   -22.4     2.9        -0.4      0.1
NCL       6.1     2.9    -8.8     3.0   -15.5     3.9         0.0      0.2

REMARKS:

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM jpl0972g.snx :
   Stations: BRAZ

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM mit0972g.snx :
   Stations: BRAZ MASP

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM ncl0972g.snx :
   Stations: BRAZ HART MADR MASP

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       
    22601M001 NTUS A        NTUS A
    22601M002        NTUS 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:
 cod09727.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 emr09727.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 esa09727.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 gfz09727.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 jpl09727.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 ngs09727.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 sio09727.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
============= ====== ====== ====== ====== ====== ====== ======
    22601M001 NTUS A NTUS A NTUS A NTUS A NTUS A        NTUS A
    22601M002                                    NTUS A       
    30302M007 HART A HARK A 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 A 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
    12353M001 YAKZ A                      YAKA A        YAKZ A
                                          YAKZ A        YAKA A
    50107M004 YAR1 A        YAR1 A YAR2 A YAR1 A YAR1 A YAR1 A
    42005M001 GALA A               GALA A GALA A GALA B GALA A
    13407S012               MADR A        MAD2 A MADR A MAD2 A
    22306M002               IISC B IISC A IISC A IISC B IISC 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]>]