Subject: [IGSREPORT-5842] Wk 0996 G-SINEX Comparisons
From: NRCan GSDivision
Date: Wed, 3 Mar 1999 13:42:06 PST

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IGS Electronic Report    Wed Mar  3 13:42:06 PST 1999      Message Number 5842
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Author: NRCan GSDivision
Subject: Wk 0996 G-SINEX Comparisons

Subject: Wk 0996 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0996   
(FEB 7, 1999 - FEB 13, 1999)

Contacts: 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.

    *** THIS ALGORITHM AND FORMAT WILL SHORTLY BE SUPERSEDED. ***

FILES COMPARED:
   jpl0996g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   mit0996g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   ncl0996g.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))

jpl0996g.snx: BAKO    .078   .000  -.003   .074  -.003  -.001  1.676   .000   .000
mit0996g.snx: BAKO    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

jpl0996g.snx: BISH    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
mit0996g.snx: BISH    .110   .000   .000   .128   .000   .000   .085   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

jpl0996g.snx: BSHM    .000   .000   .000   .000   .000   .000   .000   .000   .000
mit0996g.snx: BSHM    .081   .000  -.001   .078  -.002   .004   .000   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

jpl0996g.snx: INEG    .000   .000   .000   .000   .000   .000   .130   .000   .000
mit0996g.snx: INEG    .081   .000  -.001   .078  -.002   .004   .100   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

mit0996g.snx: PETP    .110   .000   .000   .128   .000   .000   .080   .000   .000
   - IERS DOMES NO 12355M001 should refer to PETR (0.0796 M. eccentricity)
     and 12355M002 to PETP (0.0435 M. eccentricity). Yet MIT lists them both for 12355M002.

mit0996g.snx: PETR    .110   .000   .000   .128   .000   .000   .044   .000   .000
   - IERS DOMES NO 12355M001 should refer to PETR (0.0796 M. eccentricity)
     and 12355M002 to PETP (0.0435 M. eccentricity). Yet MIT lists them both for 12355M002.

mit0996g.snx: TIXI    .108   .000   .000   .128   .001   .002   .079   .000   .000
   - According to igs_01.pcv, DORNE MARGOLIN ASH antenna should have L1/L2 vertical offset
     0.110, 0.128 M. respectively with 0.0 L1/L2 offset north and east. This leaves MIT
     slightly off (but < 3 mm. in all offsets).

jpl0996g.snx: BARB    .000   .000   .000   .000   .000   .000   .000   .000   .000
jpl0996g.snx: MDVO    .000   .000   .000   .000   .000   .000   .146   .000   .000
jpl0996g.snx: MONP    .000   .000   .000   .000   .000   .000   .119   .000   .000
jpl0996g.snx: SUTH    .000   .000   .000   .000   .000   .000   .119   .000   .000
jpl0996g.snx: TROM    .078   .000   .000   .096   .000   .000  2.369   .000   .000

FILE ncl0996g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

 
ANTENNA PHASE CENTRE CONFLICTS IN FILE jpl0996g.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 
 
COORDINATE DIFFERENCE THRESHOLD FOR STATION REJECTION: 55 mm.
(REFERS TO COORDINATE DIFFERENCE FROM ITRF96 AFTER 7-PARAMETER TRANSFORMATION)
CONFIDENCE  LEVEL  FOR OUTLIER DETECTION             : 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lon HARK JPL-NCL   Lon MALI JPL-NCL   Lon DGAR JPL-NCL
   Lon HRAO JPL-NCL   Hgt LPGS JPL-MIT   Hgt OHIG JPL-MIT
   Hgt WUHN JPL-NCL   Hgt COCO MIT-NCL   Hgt LPGS MIT-NCL

135 GLOBAL STATIONS:
   ALBH ALGO ALIC AMC2 ANKR AOML ASC1 AUCK BAHR BOGO
   BOGT BOR1 BRAZ BRMU BRUS CAGL CAS1 CASC CEDU CHAT
   CHUR CIT1 CRO1 DAV1 DRAO DUBO EISL ELAT FAIR FLIN
   FORT GILB GLSV GODE GOL2 GOLD GOPE GOUG GRAS GRAZ
   GUAM HERS HFLK HOB2 HOFN HOLB IISC IRKT JOZE JPLM
   KABR KARR KATZ KELY KIRU KOKB KOSG KOUR KSTU KUNM
   KWJ1 LAMA MAC1 MAD2 MADR MAG0 MAS1 MATE MAW1 MCM4
   MDO1 MEDI METS MKEA NANO NICO NLIB NOTO NOUM NRC1
   NTUS NYA1 NYAL OBER ONSA PENC PERT PIE1 POL2 POTS
   PRDS QUIN RAMO RIOG RIOP SANT SCH2 SELE SFER SHAO
   SJDV SOL1 STJO SUWN TAEJ TELA THU1 TID2 TIDB TOUL
   TOW2 TRO1 TSKB UCLU UPAD URUM USNA USNO USUD VESL
   VILL WES2 WHIT WILL WSLR WSRT WTZR XIAN YAKA YAKZ
   YAR1 YELL ZECK ZIMM ZWEN     

43 FIDUCIAL STATIONS:
   ALGO BAHR BRAZ BRMU CAS1 DAV1 DRAO FAIR FORT GODE
   GRAZ GUAM HOB2 IRKT KOKB KOSG KOUR KWJ1 MAC1 MAD2
   MALI MAS1 MATE MCM4 MDO1 NLIB NYAL OHIG ONSA PERT
   PIE1 POTS SANT SHAO THU1 TIDB TSKB VILL WES2 WTZR
   YAR1 YELL ZWEN       

AVERAGE COORDINATE RMS USING ITRF96:

            135    GLOBAL  STATIONS         43   FIDUCIAL   STATIONS
        JPL-MIT   JPL-NCL   MIT-NCL JPL-ITRF96 MIT-ITRF96 NCL-ITRF96
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.0       1.3       1.2        4.7        5.0        4.5 
Lon        0.9       3.4       3.3        9.2        9.0        6.2 
Hgt        3.2       2.6       4.3       16.3       17.5       16.5 
3D         3.4       4.4       5.5       19.3       20.3       18.2

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

       141    GLOBAL  STATIONS         43   FIDUCIAL   STATIONS
   JPL-MIT   JPL-NCL   MIT-NCL JPL-ITRF96 MIT-ITRF96 NCL-ITRF96
   -------   -------   ------- ---------- ---------- ----------
     0.165     0.067     0.317     12.761     20.745      7.006

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      -0.1     1.9    -2.0     2.0     4.4     2.8        -0.9      0.1
MIT      -0.8     1.4    -1.8     1.4     3.6     1.9        -0.7      0.1
NCL       0.8     2.9    -7.1     2.8     5.1     4.1        -0.8      0.1

REMARKS:
THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM jpl0996g.snx :
   Stations: AREQ KERG KIT3 LHAS

FOR THE FILE mit0996g.snx, UT WAS DELETED & THE A PRIORI COVARIANCE MATRIX 
WAS SCALED UPWARD (ALL ELEMENTS) BY A FACTOR OF 0.05% PRIOR TO DECONSTRAINING.

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM mit0996g.snx :
   Stations: AREQ HART KERG KIT3 LHAS

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM ncl0996g.snx :
   Stations: AREQ BRAZ HART KERG KIT3 LHAS MAD2 OHIG TROM

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
============= ====== ====== ======
    40472S003 AMCT A              
              AMC2 A              
    40472S004        AMC2 A       
    40405S031 GOL2 A GOLD A GOL2 A
              GOLD A GOL2 A GOLD A
              GOL1 A              
    30302M007 HARK A HARK A HARK A
              HART A              
              HAR1 A              
    22306M002 IISC A IISC A IISC A
              IIS1 A              
    13407S012 MAD2 A MAD2 A       
              MADR A MADR A       
    31303M002 MAS1 A        MAS1 A
              MASP A              
    31303M001        MAS1 A       
    12309M002 MDVO A        MDVO A
    12309M001        MDVO A       
    12355M001 PETR A              
    12355M002 PETP A PETP A PETP A
                     PETR 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  BISH A  BSHM A  ELAT A  GILB A  INEG 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  INEG A  URUM A  BISH A  KATZ A  GILB A  KABR A  BSHM A  ELAT A  TELA A

SITE/ID BLOCK IERS DOMES NOS. VS STATION CODE/PT FIELDS IN ABBREVIATED .ssc FILES:
 cod09967.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 emr09967.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 esa09967.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 gfz09967.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 jpl09967.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 ngs09967.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 sio09967.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
============= ====== ====== ====== ====== ====== ====== ======
    12355M002 PETR A               PETP A               PETP A
    12355M001                             PETP A              
    50107M004 YAR1 A 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
    30302M007 HART A HART B HART B HARK A HARK A HART B HARK A
    12353M001 YAKZ A                      YAKA A YAKA A YAKZ A
    10302M006 TROM A               TRO1 A TRO1 A        TRO1 A
    31303M002 MASP A MASP B MASP B MAS1 A MAS1 A MASP B MAS1 A
    40472S004 AMCT A                                    AMC2 A
    40472S003                             AMC2 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
    22601M001 NTUS A        NTUS A NTUS A NTUS A        NTUS A
    22601M002                                    NTUS A       
    13407S012               MADR A        MAD2 A MADR A MAD2 A
 
MISSING IERS DOMES NOS AT GFZ:
-----------------------------
  BISH A  URUM A  RIOG A
 
MISSING IERS DOMES NOS AT NGS:
-----------------------------
  BAKO A
 
MISSING IERS DOMES NOS AT SIO:
-----------------------------
  INEG A  KATZ A  GILB A  KABR A  BSHM A  ELAT A  TELA A

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

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