Subject: [IGSREPORT-2053] Subject
From: M B Heflin
Date: Mon, 2 Oct 1995 14:47:46 PDT

IGS Electronic Report    Mon Oct  2 14:47:46 PDT 1995      Message Number 2053
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Author: M B Heflin 
Subject: Subject:  Wk 817 JPL Type Two Analysis Center Comparison

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TYPE TWO ANALYSIS CENTER COMPARISON FROM JPL FOR GPS WEEK 817 SEP 03 - 09 1995
******************************************************************************

M B Heflin, J F Zumberge, D C Jefferson, M M Watkins, F H Webb

all at the Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA  91109.

Solutions in SINEX format were obtained from COD, EMR, GFZ, JPL, and SIO.  Each
center was compared to each other center by estimating a 7-parameter Helmert
transformation to minimize the least-squares coordinate residuals.

The following table summarizes comparison results.  The North, East, and
Vertical WRMS values are given in mm for each pair.  The number of common sites
is given directly underneath the values for WRMS.  The number underneath each
center's name is the scale factor applied to the formal errors from that
center.  A list of all residuals significant at the level of three sigma or
higher is given after the summary.  These residuals were removed from the final
comparisons.  Transformation parameters for each pair are given at the end of
the report.

Remarks:  The two sinex files from SIO were combined before comparison.

Some submissions include positions which were effectively not estimated.  If a
Sinex file contains sites with a priori constraints <= 1 mm, then those sites
are removed before comparison with other Sinex files.

TABLE OF COMPARISON RESIDUALS (N E V in mm)
--------------------------------------------------------------------------------
             emr         esa         gfz         jpl         ngs         sio
       +-----------+-----------+-----------+-----------+-----------+-----------+
 cod   |  3   8  16|           |  3   8  21|  8   7  21|           |  7  12  20|
 9.0   |     12    |           |     27    |     22    |           |     27    |
       +-----------+-----------+-----------+-----------+-----------+-----------+
             emr   |           |  4  12  18|  8   9  15|           |  8  13  20|
             4.0   |           |     11    |     22    |           |     25    |
                   +-----------+-----------+-----------+-----------+-----------+
                         esa   |           |           |           |           |
                               |           |           |           |           |
                               +-----------+-----------+-----------+-----------+
                                     gfz   |  7   7  20|           |  8  10  22|
                                     9.0   |     17    |           |     25    |
                                           +-----------+-----------+-----------+
                                                 jpl   |           | 10   7  18|
                                                 5.0   |           |     31    |
                                                       +-----------+-----------+
                                                             ngs   |           |
                                                                   |           |
                                                                   +-----------+
                                                                         sio
                                                                         1.0
-------------------------------------------------------------------------------

THREE SIGMA RESIDUALS AND FORMAL ERRORS (mm)
-------------------------------------------------------------------------------
PAIR     SITE     N      E      V        SN     SE     SV
NONE
-------------------------------------------------------------------------------

COD TO EMR TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .2812E+02
 DOF        =          29
 CHI^2/DOF  =         .97
 RX =   .1616E-08  +-   .1060E-08  rad
 RY =   .5458E-09  +-   .9432E-09  rad
 RZ =   .5245E-09  +-   .1218E-08  rad
 TX =  -.6854E-02  +-   .6355E-02  m
 TY =   .1337E-01  +-   .6118E-02  m
 TZ =   .8961E-02  +-   .5300E-02  m
 S  =   .6793E-09  +-   .9856E-09  parts
----------------------------------------

COD TO GFZ TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .3591E+02
 DOF        =          74
 CHI^2/DOF  =         .49
 RX =   .2220E-09  +-   .3641E-09  rad
 RY =  -.4047E-09  +-   .3893E-09  rad
 RZ =   .2521E-09  +-   .6254E-09  rad
 TX =   .1684E-02  +-   .3188E-02  m
 TY =  -.1815E-02  +-   .2817E-02  m
 TZ =  -.1715E-02  +-   .2125E-02  m
 S  =  -.1547E-09  +-   .9124E-09  parts
----------------------------------------

COD TO JPL TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .5882E+02
 DOF        =          59
 CHI^2/DOF  =        1.00
 RX =  -.3208E-08  +-   .2825E-09  rad
 RY =   .1824E-08  +-   .2926E-09  rad
 RZ =  -.3265E-07  +-   .4603E-09  rad
 TX =   .1378E-01  +-   .2722E-02  m
 TY =   .2091E-01  +-   .2531E-02  m
 TZ =  -.1021E+00  +-   .2361E-02  m
 S  =   .8105E-09  +-   .6795E-09  parts
----------------------------------------

COD TO SIO TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .7381E+02
 DOF        =          74
 CHI^2/DOF  =        1.00
 RX =   .3902E-08  +-   .2425E-09  rad
 RY =   .2040E-08  +-   .2639E-09  rad
 RZ =  -.3146E-07  +-   .3943E-09  rad
 TX =   .4946E-03  +-   .2229E-02  m
 TY =   .9823E-01  +-   .2272E-02  m
 TZ =   .4222E-01  +-   .2461E-02  m
 S  =   .9747E-09  +-   .5936E-09  parts
----------------------------------------

EMR TO GFZ TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .2238E+02
 DOF        =          26
 CHI^2/DOF  =         .86
 RX =  -.2244E-08  +-   .1080E-08  rad
 RY =  -.8526E-09  +-   .9882E-09  rad
 RZ =  -.1262E-09  +-   .1384E-08  rad
 TX =   .6278E-02  +-   .6734E-02  m
 TY =  -.1629E-01  +-   .6408E-02  m
 TZ =  -.1220E-01  +-   .5329E-02  m
 S  =  -.1616E-09  +-   .1078E-08  parts
----------------------------------------

EMR TO JPL TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .5969E+02
 DOF        =          59
 CHI^2/DOF  =        1.01
 RX =  -.5763E-08  +-   .9533E-09  rad
 RY =   .1046E-08  +-   .8075E-09  rad
 RZ =  -.3279E-07  +-   .9922E-09  rad
 TX =   .2129E-01  +-   .4965E-02  m
 TY =  -.1102E-03  +-   .4910E-02  m
 TZ =  -.1053E+00  +-   .4333E-02  m
 S  =  -.9021E-09  +-   .5175E-09  parts
----------------------------------------

EMR TO SIO TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .8045E+02
 DOF        =          68
 CHI^2/DOF  =        1.18
 RX =   .2008E-08  +-   .9871E-09  rad
 RY =   .6531E-09  +-   .8456E-09  rad
 RZ =  -.3123E-07  +-   .1067E-08  rad
 TX =   .8801E-02  +-   .5152E-02  m
 TY =   .8082E-01  +-   .5112E-02  m
 TZ =   .3626E-01  +-   .4484E-02  m
 S  =  -.8037E-10  +-   .5401E-09  parts
----------------------------------------

GFZ TO JPL TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .3664E+02
 DOF        =          44
 CHI^2/DOF  =         .83
 RX =  -.3050E-08  +-   .3806E-09  rad
 RY =   .2294E-08  +-   .4300E-09  rad
 RZ =  -.3258E-07  +-   .7589E-09  rad
 TX =   .1636E-01  +-   .3697E-02  m
 TY =   .2446E-01  +-   .3377E-02  m
 TZ =  -.9780E-01  +-   .2637E-02  m
 S  =   .1527E-08  +-   .9161E-09  parts
----------------------------------------

GFZ TO SIO TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .4367E+02
 DOF        =          68
 CHI^2/DOF  =         .64
 RX =   .4006E-08  +-   .3730E-09  rad
 RY =   .2479E-08  +-   .4189E-09  rad
 RZ =  -.3189E-07  +-   .7730E-09  rad
 TX =  -.6550E-03  +-   .3743E-02  m
 TY =   .1034E+00  +-   .3567E-02  m
 TZ =   .4391E-01  +-   .2778E-02  m
 S  =   .1399E-08  +-   .8266E-09  parts
----------------------------------------

JPL TO SIO TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .8563E+02
 DOF        =          86
 CHI^2/DOF  =        1.00
 RX =   .7344E-08  +-   .2105E-09  rad
 RY =  -.1671E-09  +-   .1960E-09  rad
 RZ =   .1357E-08  +-   .5359E-09  rad
 TX =  -.1378E-01  +-   .2621E-02  m
 TY =   .8136E-01  +-   .2336E-02  m
 TZ =   .1446E+00  +-   .1648E-02  m
 S  =   .3324E-09  +-   .4297E-09  parts
----------------------------------------

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