Subject: [IGSREPORT-4732] Wk 0946 G-SINEX Comparisons
From: AC Coordinator / NRCan GSDivision
Date: Tue, 24 Mar 1998 12:10:32 PST

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IGS Electronic Report    Tue Mar 24 12:10:32 PST 1998      Message Number 4732
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Author: AC Coordinator / NRCan GSDivision
Subject: Wk 0946 G-SINEX Comparisons

Subject: Wk 0946 G-SINEX Comparisons

Comparison of GNAAC Combined SINEX Solutions - Week 0946   
(FEB 22, 1998 - FEB 28, 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 13 ITRF94 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:
   mit0946g.snx at cddis.gsfc.nasa.gov
   jpl0946g.snx at cddis.gsfc.nasa.gov
   ncl0946g.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))

jpl0946g.snx: BISH    .075   .002  -.001   .069  -.001   .002   .046   .000   .000
mit0946g.snx: BISH    .078   .000  -.003   .074  -.003  -.001   .046   .000   .000
   - Unresolvable (no log file)

jpl0946g.snx: CAGL    .110   .000   .000   .128   .000   .000   .000   .000   .000
mit0946g.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.

jpl0946g.snx: ELAT    .069   .000   .000   .068   .000   .000  -.011   .000   .000
mit0946g.snx: ELAT    .078   .000  -.003   .074  -.003  -.001  -.011   .000   .000
   - Unresolvable (no log file)

jpl0946g.snx: KATZ    .069   .000   .000   .068   .000   .000  -.012   .000   .000
mit0946g.snx: KATZ    .078   .000  -.003   .074  -.003  -.001  -.012   .000   .000
   - Unresolvable (no log file)

jpl0946g.snx: KOUR    .078   .000   .000   .096   .000   .000   .132   .000   .000
mit0946g.snx: KOUR    .078   .000   .000   .096   .000   .000   .045   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.045 M.

jpl0946g.snx: MALI    .078   .000   .000   .096   .000   .000   .222   .000   .000
mit0946g.snx: MALI    .078   .000   .000   .096   .000   .000   .135   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.135 M.

jpl0946g.snx: NOUM    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
mit0946g.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.

jpl0946g.snx: TELA    .069   .000   .000   .068   .000   .000   .000   .000   .000
mit0946g.snx: TELA    .078   .000  -.003   .074  -.003  -.001   .000   .000   .000
   - Unresolvable (no log file)

jpl0946g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000
mit0946g.snx: WUHN    .110   .000   .000   .128   .000   .000  2.320   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 2.355 M.

jpl0946g.snx: YAR1    .078   .000   .000   .096   .000   .000   .073   .000   .000
mit0946g.snx: YAR1    .078   .000   .000   .096   .000   .000   .073   .000   .000
   - Both wrong. Should be L1/L2 offset .110, .128 M., eccentricity 0.081 M.

jpl0946g.snx: HARK    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0946g.snx: HART    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0946g.snx: HARV    .110   .000   .000   .128   .000   .000   .061   .000   .000
jpl0946g.snx: HOFN    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: HRAO    .110   .000   .000   .128   .000   .000  9.754   .000   .000
jpl0946g.snx: LPGS    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: NICO    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: SELE    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: SFER    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: SOFI    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: UPAD    .078   .000  -.003   .074  -.003  -.001  1.962   .000   .000
jpl0946g.snx: ZECK    .110   .000   .000   .128   .000   .000   .000   .000   .000
jpl0946g.snx: ZIMM    .069   .000   .000   .068   .000   .000   .000   .000   .000

FILE ncl0946g.snx MISSING THE SITE/GPS_PHASE_CENTER BLOCK.
DEFAULTING TO KNOWN L1/L2 OFFSETS AND ECCENTRICITIES.

ANTENNA PHASE CENTRE CONFLICTS IN FILE mit0946g.snx (SEE REMARKS BELOW)         
   MASP Multiple Sites       
   AREQ Multiple Sites      
   IISC Multiple Sites      
   MDVO Multiple Sites      
 
SITES AFFECTED BY ABOVE CONFLICTS, NON-FIDUCIAL SITES SUBSEQUENTLY EXCLUDED:
   Stations: MASP AREQ IISC MDVO 
 
CONFIDENCE LEVEL FOR OUTLIER DETECTION (ITRF94): 99%
OUTLIERS REJECTED (COORD/STATION/GNAACs):
   Lat CAS1 MIT-JPL   Lat MAS1 MIT-JPL   Lat KERG MIT-JPL
   Lat DAV1 MIT-JPL   Lat SANT MIT-JPL   Lat MAS1 MIT-NCL
   Lat KERG MIT-NCL   Lon TAEJ MIT-JPL   Lon NTUS MIT-JPL
   Lon AUCK MIT-JPL   Lon AUCK MIT-NCL   Hgt WSRT JPL-NCL
   Hgt NTUS MIT-JPL   Hgt MCM4 MIT-JPL   Hgt FORT MIT-JPL
   Hgt NTUS MIT-NCL          

57 GLOBAL STATIONS:
   ALBH ALGO ANKR ASC1 BAHR BOGT BRMU CHAT COCO CRO1
   DGAR DRAO DUBO EISL FAIR GODE GOLD GRAZ GUAM HOB2
   IRKT KELY KIRU KIT3 KOKB KOSG KWJ1 LHAS MAC1 MADR
   MATE MDO1 METS MKEA NLIB NRC1 ONSA PERT POL2 POTS
   RCM6 REYK SHAO STJO TAHI THU1 TIDB TSKB USNO USUD
   VILL WES2 WHIT WTZR YAR1 YELL ZWEN   

11 FIDUCIAL STATIONS:
   ALGO FAIR GOLD KOKB KOSG MADR SANT TIDB WTZR YAR1
   YELL         

AVERAGE COORDINATE RMS USING ITRF94:

             57    GLOBAL  STATIONS         11   FIDUCIAL   STATIONS
        MIT-JPL   MIT-NCL   JPL-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
           (mm)      (mm)      (mm)       (mm)       (mm)       (mm)
        -------   -------   ------- ---------- ---------- ----------
Lat        1.3       1.2       0.6        9.0        9.1        9.0 
Lon        2.1       1.5       1.0        8.6        7.9        8.2 
Hgt        3.0       3.0       1.6        9.9        8.4        9.4 
3D         3.9       3.6       2.0       15.9       14.7       15.4

VARIANCE FACTORS WITH ITRF94 (CHI-SQUARE / (DEGREES OF FREEDOM)):

        57    GLOBAL  STATIONS         11   FIDUCIAL   STATIONS
   JPL-NCL   MIT-JPL   MIT-NCL MIT-ITRF94 JPL-ITRF94 NCL-ITRF94
   -------   -------   ------- ---------- ---------- ----------
     0.100     0.757     0.513      2.077      1.360      1.610

OFFSETS AND SCALE FACTOR WRT ITRF94 (FIDUCIAL STATIONS):
(TRANSFORMATION FROM ITRF94 TO GNAAC SINEX FILES)

      Tx (mm) STD(mm) Ty (mm) STD(mm) Tz (mm) STD(mm) Scale (ppb) STD(ppb)
      ------- ------- ------- ------- ------- ------- ----------- --------
JPL     -12.4     4.1    33.4     4.5     7.0     5.7        -1.5      0.4
MIT      -8.7     3.0    11.8     3.2     0.9     3.6        -1.4      0.4
NCL     -13.3     4.1    30.5     4.2     6.8     5.8        -1.5      0.4

REMARKS:

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM mit0946g.snx :
   Stations: TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM jpl0946g.snx :
   Stations: TROM

THE FOLLOWING ITRF94 FIDUCIAL STATIONS ARE MISSING FROM ncl0946g.snx :
   Stations: HART TROM

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

              <-------------------- ACs --------------------->
IERS DOMES NO    COD  NRCAN    ESA    GFZ    JPL    NGS    SIO  
============= ====== ====== ====== ====== ====== ====== ======
    42202M005 AREQ A AREQ A AREQ B AREQ A AREQ A AREQ B AREQ A
    30302M007 HART A HARK A HART B HARK A        HARK A
    30302M002                             HARK A
    30302M002                             HRAO A
    ---------                                           HARK A
    31303M002 MASP A MAS1 A MASP B MAS1 A        MAS1 A
    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        AREQ B 
    30302M007        HART B HARK A
    30302M004               HRAO A
    30302M002 HART A HARK A       
    30302M002 HARK A              
    30302M002 HRAO A HRAO A             
    31303M002 MAS1 A MASP B MAS1 A
    ---------        MASP A
    31303M001 MASP A              
    22306M002        IISC B IISC A
    22306M001 IISC A IISC A       
    22306M001 IIS1 A                    
    12309M002 MDVO A MDVO B
    12309M002 MDV1 A 
    12309M001        MDVO A

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

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