Subject: [IGSREPORT-4738] Wk 0947 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Wed, 25 Mar 1998 8:34:04 PST

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IGS Electronic Report    Wed Mar 25  8:34:04 PST 1998      Message Number 4738
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0947 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0947   
(MAR 1, 1998 - MAR 7, 1998)

Contacts: J. Kouba ([email-masked])
          D. Hutchison([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 stations  not  present  in  all GNAAC combined SINEX files were de-
      leted  from all three combined solutions.  Every solution was then sub-
      jected to a 7-parameter transformation  into  a common reference system
      (the 47 ITRF96 station positions). 

   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:
   mit0947g.snx at cddis.gsfc.nasa.gov
   jpl0947g.snx at cddis.gsfc.nasa.gov
   ncl0947g.snx at cddis.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))

jpl0947g.snx: BISH    .075   .002  -.001   .069  -.001   .002   .046   .000   .000
mit0947g.snx: BISH    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
   - Unresolvable (no log file)

jpl0947g.snx: CAGL    .110   .000   .000   .128   .000   .000   .000   .000   .000
mit0947g.snx: CAGL    .110   .000   .000   .128   .000   .000   .010   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.045 M.

jpl0947g.snx: ELAT    .069   .000   .000   .068   .000   .000  -.011   .000   .000
mit0947g.snx: ELAT    .078   .000  -.003   .074  -.003  -.001  -.011   .000   .000
   - Unresolvable (no log file)

jpl0947g.snx: MALI    .078   .000   .000   .096   .000   .000   .222   .000   .000
mit0947g.snx: MALI    .078   .000   .000   .096   .000   .000   .167   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.135 M.

jpl0947g.snx: MOIN    .110   .000   .000   .128   .000   .000   .994   .000   .000
mit0947g.snx: MOIN    .110   .000   .000   .128   .000   .000   .274   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.086 M.

jpl0947g.snx: NOUM    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
mit0947g.snx: NOUM    .075   .002  -.001   .069  -.001   .002   .000   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.000 M.

jpl0947g.snx: TELA    .069   .000   .000   .068   .000   .000   .000   .000   .000
mit0947g.snx: TELA    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
   - Unresolvable (no log file)

jpl0947g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000
mit0947g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.356   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 2.355 M.

jpl0947g.snx: YAR1    .078   .000   .000   .096   .000   .000   .073   .000   .000
mit0947g.snx: YAR1    .078   .000   .000   .096   .000   .000   .114   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.081 M.

jpl0947g.snx: HARK    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0947g.snx: HART    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0947g.snx: HARV    .110   .000   .000   .128   .000   .000   .061   .000   .000
jpl0947g.snx: HOFN    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: HRAO    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0947g.snx: KOUR    .078   .000   .000   .096   .000   .000   .132   .000   .000
jpl0947g.snx: LPGS    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: NICO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: SELE    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: SFER    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: SOFI    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: UPAD    .078   .000  -.003   .074  -.003  -.001  1.962   .000   .000
jpl0947g.snx: ZECK    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0947g.snx: ZIMM    .069   .000   .000   .068   .000   .000   .000   .000   .000

FILE ncl0947g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0947g.snx                             
   AREQ Multiple Sites       
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: AREQ 
 
CONFIDENCE LEVEL FOR OUTLIER DETECTION (ITRF96): 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat ANKR JPL-NCL   Lat ANKR MIT-JPL   Lon RCM6 JPL-NCL
   Lon DGAR JPL-NCL   Lon ANKR JPL-NCL   Lon ANKR MIT-JPL
   Hgt BOGT MIT-JPL   Hgt FORT MIT-JPL   Hgt SANT MIT-NCL
   Hgt BOGT MIT-NCL          

60 GLOBAL STATIONS:
   ALGO ASC1 AUCK BAHR BRMU BRUS CAS1 CHAT COCO CRO1
   DAV1 DRAO EISL FAIR GODE GOLD GRAZ GUAM HOB2 IISC
   IRKT KELY KERG KIRU KIT3 KOKB KOSG KWJ1 LHAS MAC1
   MADR MATE MCM4 MDO1 METS MKEA NLIB OHIG ONSA PERT
   PIE1 POL2 POTS REYK SHAO STJO TAEJ TAHI THU1 TIDB
   TSKB USNO USUD WES2 WHIT WSRT WTZR YAR1 YELL ZWEN

38 FIDUCIAL STATIONS:
   ALGO BRMU DAV1 DRAO FAIR FORT GODE GOLD GRAZ GUAM
   HOB2 IRKT KERG KIT3 KOKB KOSG KWJ1 LHAS MAC1 MADR
   MATE MDO1 NLIB OHIG ONSA PERT PIE1 POTS SANT SHAO
   THU1 TIDB TSKB WES2 WTZR YAR1 YELL ZWEN  

AVERAGE COORDINATE RMS USING ITRF96:

             60    GLOBAL  STATIONS         38   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF96 JPL-ITRF96 NCL-ITRF96
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.4       1.0       0.8        3.5        4.1        3.6 
Lon        1.4       1.1       1.1        5.0        5.4        4.7 
Hgt        3.1       3.0       2.2        8.4        8.7        8.0 
3D         3.7       3.4       2.6       10.4       11.1        9.9

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

        60    GLOBAL  STATIONS         38   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF96 JPL-ITRF96 NCL-ITRF96
   -------   -------   ------- ---------- ---------- ----------
     0.150     0.589     0.290      2.929      2.827      2.043

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      -2.2     2.9    21.7     2.9    -6.8     4.8        -0.8      0.1
MIT      -1.8     1.9     1.9     1.9    -7.7     2.8        -0.5      0.1
NCL      -2.5     3.1    18.7     3.2    -3.6     5.0        -0.5      0.2

REMARKS:

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM jpl0947g.snx :
   Stations: BRAZ NYAL TROM

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM mit0947g.snx :
   Stations: BRAZ NYAL TROM

THE FOLLOWING ITRF96 FIDUCIAL STATIONS ARE MISSING FROM ncl0947g.snx :
   Stations: BRAZ NYAL TROM HART MASP VILL
	     HARK A (IERS DOMES NO. 30302M007) REPLACES HART.

INCONSISTENCIES BETWEEN STATION NAMES WITH IDENTICAL IERS DOMES NOS.
AT Arequipa, Peru (AREQ), Hartebeesthoek, S. A. (HART, HARK, HAR1, HRAO),
Mas Palomas, Canary Is. (MASP, MAS1), Bangalore, India (IISC, IIS1)
AND Mendeleevo, Russia (MDVO, MDV1)

              <-------------------- ACs --------------------->
IERS DOMES NO    COD  NRCAN    ESA    GFZ    JPL    NGS    SIO  
============= ====== ====== ====== ====== ====== ====== ======
    42202M005 AREQ A AREQ B AREQ B AREQ A AREQ A AREQ B AREQ A
    30302M007 HART A HART B HART B HARK A        HART B
    30302M002                             HARK A
    ---------                                           HARK A
    31303M002 MASP A MASP B MASP B MAS1 A        MASP B
    31303M001                                           MASP A
    22306M002 IISC A        IISC B IISC A        IISC A 
    22306M001                             IISC A        IISC A
    12309M002 MDVO A        MDVO B        MDVO A
    12309M001                                           MDVO A

              <----- GNAACs ----->
IERS DOMES NO    JPL    MIT    NCL
============= ====== ====== ======
    42202M005 AREQ A AREQ A AREQ A
    42202M005 ARE1 A AREQ B
    30302M007        HART B HARK A
    30302M004        HRAO A 
    30302M002 HART A HARK A       
    30302M002 HARK A              
    30302M002 HAR1 A              
    30302M002 HRAO A 
    31303M002 MAS1 A MASP B 
    31303M001 MASP A MAS1 A       
    22306M002               IISC A
    22306M001 IISC A IISC A       
    22306M001 IIS1 A                    
    12309M002 MDVO A 
    12309M002 MDV1 A 
    12309M001        MDVO A

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

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