[IGSREPORT-2003] Subject

[M]

IGS Electronic Report    Mon Sep 11  9:30:02 PDT 1995      Message Number 2003
******************************************************************************

Author: M B Heflin 
Subject: Subject: Wk 0813 JPL Type Two Analysis Center Comparison

******************************************************************************
TYPE TWO ANALYSIS CENTER COMPARISON FROM JPL FOR GPS WEEK 813 AUG 6-12, 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.

Coordinate comparisons for GPS week 813 mark the beginning of type two analysis
activities at JPL.  Solutions in SINEX format were obtained from EMR, COD, and
JPL.  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.  Transformation parameters for each pair are given after the summary
table.  A list of all individual residuals significant at the level of three
sigma or higher is also provided.

TABLE OF COMPARISON RESIDUALS (N E V in mm)
--------------------------------------------------------------------------------
             emr         esa         gfz         jpl         ngs         sio
       +-----------+-----------+-----------+-----------+-----------+-----------+
 cod   |  7   8  12|           |           |  9   9  18|           |           |
10.0   |     25    |           |           |     36    |           |           |
       +-----------+-----------+-----------+-----------+-----------+-----------+
             emr   |           |           |  6  11  14|           |           |
             3.0   |           |           |     22    |           |           |
                   +-----------+-----------+-----------+-----------+-----------+
                         esa   |           |           |           |           |
                               |           |           |           |           |
                               +-----------+-----------+-----------+-----------+
                                     gfz   |           |           |           |
                                           |           |           |           |
                                           +-----------+-----------+-----------+
                                                 jpl   |           |           |
                                                 3.0   |           |           |
                                                       +-----------+-----------+
                                                             ngs   |           |
                                                                   |           |
                                                                   +-----------+
                                                                         sio
--------------------------------------------------------------------------------

COD TO EMR TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .1987E+03
 DOF        =          68
 CHI^2/DOF  =        2.92
 RX =   .2374E-08  +-   .6813E-09  rad
 RY =  -.2349E-10  +-   .5721E-09  rad
 RZ =  -.1969E-09  +-   .6857E-09  rad
 TX =   .1451E-02  +-   .3258E-02  m
 TY =   .2304E-01  +-   .3328E-02  m
 TZ =   .1145E-02  +-   .2973E-02  m
 S  =   .8744E-10  +-   .3139E-09  parts
----------------------------------------

COD TO JPL TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .1136E+03
 DOF        =         101
 CHI^2/DOF  =        1.12
 RX =   .1516E-08  +-   .1764E-09  rad
 RY =  -.1921E-09  +-   .1802E-09  rad
 RZ =   .8854E-09  +-   .2996E-09  rad
 TX =  -.2544E-04  +-   .1552E-02  m
 TY =   .1681E-02  +-   .1644E-02  m
 TZ =  -.3107E-02  +-   .1423E-02  m
 S  =   .1571E-08  +-   .3146E-09  parts
----------------------------------------

EMR TO JPL TRANSFORMATION PARAMETERS
----------------------------------------
 CHI^2      =   .5757E+02
 DOF        =          59
 CHI^2/DOF  =         .98
 RX =  -.1076E-08  +-   .7192E-09  rad
 RY =  -.1640E-10  +-   .6214E-09  rad
 RZ =   .9869E-09  +-   .7764E-09  rad
 TX =  -.2186E-02  +-   .3830E-02  m
 TY =  -.2050E-01  +-   .3881E-02  m
 TZ =  -.6711E-02  +-   .3540E-02  m
 S  =   .1104E-08  +-   .4568E-09  parts
----------------------------------------

THREE SIGMA RESIDUALS AND FORMAL ERRORS (mm)
--------------------------------------------------------------------------------
PAIR     SITE     N      E      V        SN     SE     SV
JPL-COD  ALGO   11.3   -1.6  -34.7      3.5    5.3    9.9
--------------------------------------------------------------------------------


[Mailed From: mbh at cobra.jpl.nasa.gov]