Subject: [IGSREPORT-5688] Wk 0981 G-SINEX Comparisons
From: NRCan GSDivision
Date: Fri, 22 Jan 1999 13:58:53 PST

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IGS Electronic Report    Fri Jan 22 13:58:53 PST 1999      Message Number 5688
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Author: NRCan GSDivision
Subject: Wk 0981 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0981   
(OCT 25, 1998 - OCT 31, 1998)

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.

FILES COMPARED:
   jpl0981g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   mit0981g.snx at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
   ncl0981g.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))

jpl0981g.snx: BSHM    .000   .000   .000   .000   .000   .000   .000   .000   .000
mit0981g.snx: BSHM    .081   .000  -.001   .078  -.002   .004   .000   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

jpl0981g.snx: INEG    .000   .000   .000   .000   .000   .000   .130   .000   .000
mit0981g.snx: INEG    .081   .000  -.001   .078  -.002   .004   .066   .000   .000
   - Unresolvable. No log file. Antenna parameters not listed in igs.snx.

jpl0981g.snx: MDVO    .000   .000   .000   .000   .000   .000   .146   .000   .000
mit0981g.snx: MDVO    .078   .000  -.003   .074  -.003  -.001   .146   .000   .000
   - Both wrong. Should be L1, L2 offset, eccentricity 0.0692, 0.0692, 0.146 M. respectively.
     Antenna EXT. L1/L2 KINEMATIC SSE listed in log file, but not igs.snx.

mit0981g.snx: NYAL    .110   .000   .000   .128   .000   .000   .000   .000   .000
   - IERS DOMES NO 10317M001 should refer to NYAL (5.2160 M. eccentricity) and 10317M003
     to NYA1 (0.0000 M. eccentricity). Yet JPL, NCL lists NYA1 A for 10317M003, while
     MIT lists NYAL B for the same IERS DOMES NO. (See REMARKS below.)

jpl0981g.snx: PETP    .110   .000   .000   .128   .000   .000   .080   .000   .000
mit0981g.snx: PETP    .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 JPL lists both PETP for 12355M001, 
     while MIT lists it for 12355M002.

jpl0981g.snx: HFLK    .078   .000   .000   .096   .000   .000   .000   .000   .000
jpl0981g.snx: MONP    .000   .000   .000   .000   .000   .000   .119   .000   .000
jpl0981g.snx: SUTH    .000   .000   .000   .000   .000   .000   .119   .000   .000
mit0981g.snx: TROM    .110   .000   .000   .128   .000   .000   .000   .000   .000
mit0981g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000

FILE ncl0981g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

 
ANTENNA PHASE CENTRE CONFLICTS IN FILE jpl0981g.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 mit0981g.snx
   MAS1 Multiple Sites
   AREQ Multiple Sites
   GALA Multiple Sites
   IISC Multiple Sites
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: MAS1 AREQ 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 MCM4   69.3 mm.

THE FOLLOWING STATIONS WERE DELETED FROM MIT
DUE TO DIFFERENCES IN EXCESS OF 55 mm. WITH ITRF96
AFTER 7-PARAMETER TRANSFORMATION TO ITRF96
 Hgt MCM4   70.8 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 MCM4   66.6 mm.

CONFIDENCE  LEVEL  FOR OUTLIER DETECTION             : 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat HRAO JPL-MIT   Lat HARK JPL-MIT   Lat GOUG JPL-MIT
   Lat HRAO MIT-NCL   Lat HARK MIT-NCL   Lat ASC1 MIT-NCL
   Lat MALI MIT-NCL   Lat AUCK MIT-NCL   Lat MAC1 MIT-NCL
   Lat CHAT MIT-NCL   Lon DGAR JPL-MIT   Lon COCO JPL-MIT
   Lon OHIG MIT-NCL   Lon COCO MIT-NCL   Lon KERG MIT-NCL
   Lon DAV1 MIT-NCL   Lon DGAR MIT-NCL   Hgt COCO JPL-MIT
   Hgt CAGL JPL-MIT   Hgt THU1 JPL-NCL   Hgt ALBH JPL-NCL
   Hgt COCO JPL-NCL   Hgt ALBH MIT-NCL     

125 GLOBAL STATIONS:
   ALGO ALIC AMC2 AOML AREQ BAHR BISH BOGO BOGT BOR1
   BRMU BRUS CAS1 CASA CEDU CHUR CRO1 DRAO DUBO EISL
   ELAT FAIR FLIN FORT GILB GLSV GODE GOL2 GOLD GOPE
   GRAS GRAZ GUAM HERS HOB2 HOFN HOLB IAVH IRKT JOZE
   JPLM KABR KARR KATZ KELY KIRU KIT3 KOKB KOSG KOUR
   KSTU KWJ1 LAMA LHAS LPGS MAD2 MADR MAG0 MAS1 MATE
   MAW1 MDO1 MEDI METS MKEA NANO NICO NLIB NOTO NOUM
   NRC1 NSSP NTUS NYA1 OBER ONSA PENC PERT PIE1 POL2
   POTS PRDS QUIN RAMO REYK RIOG SANT SCH2 SELE SHAO
   SJDV SOL1 STJO SUWN TAEJ TELA TID2 TIDB TIXI TOUL
   TOW2 TRO1 TSKB UCLU UPAD URUM USNA USNO USUD VILL
   WES2 WHIT WILL WSLR WSRT WTZR XIAN YAKA YAKZ YAR1
   YAR2 YELL ZECK ZIMM ZWEN     

44 FIDUCIAL STATIONS:
   ALGO AREQ BAHR BRMU CAS1 DAV1 DRAO FAIR FORT GODE
   GRAZ GUAM HOB2 IRKT KERG KIT3 KOKB KOSG KOUR KWJ1
   LHAS MAC1 MAD2 MALI MAS1 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         44   FIDUCIAL   STATIONS
        JPL-MIT   JPL-NCL   MIT-NCL JPL-ITRF96 MIT-ITRF96 NCL-ITRF96
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        0.8       1.1       1.0        5.4        4.8        4.9 
Lon        1.5       1.0       1.8        6.0        6.0        5.9 
Hgt        2.5       3.4       3.4       12.1       11.9       12.3 
3D         3.0       3.7       4.0       14.6       14.2       14.5

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

       125    GLOBAL  STATIONS         44   FIDUCIAL   STATIONS
   JPL-MIT   JPL-NCL   MIT-NCL JPL-ITRF96 MIT-ITRF96 NCL-ITRF96
   -------   -------   ------- ---------- ---------- ----------
     0.163     0.252     0.217      5.339      6.475      4.505

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      -7.5     1.9    -7.0     2.0    -1.2     3.1        -0.5      0.1
MIT      -2.3     1.7    -7.4     1.8    -2.5     2.2        -0.4      0.1
NCL      -7.8     3.0    -5.3     3.0    -7.7     4.1        -0.6      0.1

REMARKS: 
 FILE mit0981g.snx: STDs for daily EOPs listed in SOLUTION/APRIORI block, with-
		    out  corresponding  covariances in SOLUTION/MATRIX_APRIORI
		    block.  Hence, these records are deleted  prior to any com-
		    putation.  NOTE:  A priori UT STD 6.66667 ms. is less than
		    all  corresponding  UT STDs in the SOLUTION/ESTIMATE block,
		    which are in turn two orders of magnitude greater than pre-
		    vious weekly UT STDs; e.g., .0279325 ms. for week 979.

 MULTIPLY-USED 4-LETTER STATION NAME CODES:
   AREQ  B 42202M005
   AREQ  A 42202M005
   GALA  A 42005M001
   GALA  B 42005M001
   IISC  A 22306M002
   IISC  B 22306M002
   TROM  A 10302M003
   TROM  B 10302M006
   NYAL  B 10317M003
   NYAL  A 10317M001

 STATION NAME/POINT CODES CHANGED IN mit0981g.snx 
 ENFORCED FROM TEMPLATE FILE igs.snx .

    Old     New      IERS
Code/Pt Code/Pt  DOMES NO
------- -------  --------
MASP  B MAS1  A 31303M002
TROM  B TRO1  A 10302M006
NYAL  B NYA1  A 10317M003

      3 Changes in all.

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM jpl0981g.snx :
   Stations: BRAZ

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM mit0981g.snx :
   Stations: BRAZ

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM ncl0981g.snx :
   Stations: BRAZ HART HOB2 MAD2 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
============= ====== ====== ======
    42202M005 AREQ A AREQ B AREQ A
              ARE1 A AREQ 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 HART B HARK A
              HART A HARK A       
              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 MASP B MAS1 A
              MASP A              
    31303M001        MAS1 A       
    12309M002 MDVO A        MDVO A
              MDV1 A              
    12309M001        MDVO A       
    10317M003 NYA1 A NYAL B NYA1 A
    12355M001 PETP A              
    12355M002        PETP A       
    50103M108 TID2 A TIDB A TID2 A
              TIDB A TID2 A TIDB A
    10302M006 TRO1 A TROM B TRO1 A
    10302M003 TROM A TROM A       
    12353M001 YAKA A YAKA A       
              YAKZ A YAKZ A       
    50107M004 YAR1 A YAR1 A YAR1 A
              YAR2 A YAR2 A       
 
MISSING IERS DOMES NOS AT JPL:
-----------------------------
  ALIC 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  AMC2 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:
 cod09817.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 emr09817.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 gfz09817.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 jpl09817.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 ngs09817.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
 sio09817.ssc at cddis.gsfc.nasa.gov or cddisa.gsfc.nasa.gov
(ENTRIES APPEAR ONLY WHERE ACS DIFFER.)

IERS DOMES NO    COD  NRCan    GFZ    JPL    NGS    SIO
============= ====== ====== ====== ====== ====== ======
    22306M002 IISC A        IISC A IISC A IISC B IISC A
    50107M004 YAR1 A YAR1 A YAR2 A YAR1 A YAR1 A YAR1 A
    31303M002 MASP A MASP B MAS1 A MAS1 A MASP B MAS1 A
    12353M001 YAKZ A               YAKA A        YAKZ A
    42202M005 AREQ A AREQ B AREQ A AREQ A AREQ B AREQ A
    42005M001 GALA A        GALA A GALA A GALA B GALA A
    40405S031 GOLD A GOLD A GOL2 A GOL2 A GOLD B GOL2 A
    50103M108 TIDB A TIDB A TID2 A TID2 A TIDB A TID2 A
    30302M007 HART A HART B HARK A HARK A HART B HARK A
    10317M003 NYAL A        NYA1 A NYA1 A        NYA1 A
    10302M006 TROM A        TRO1 A               TRO1 A
    10302M003                             TROM A TROM A
    13407S012                      MAD2 A MADR A MAD2 A
    22601M001                      NTUS A        NTUS A
    22601M002                             NTUS A       
 
MISSING IERS DOMES NOS AT GFZ:
-----------------------------
  BISH A  URUM A  RIOG A
 
MISSING IERS DOMES NOS AT SIO:
-----------------------------
  INEG A  AMC2 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]>]