[IGSREPORT-0751] GPS Earth Orientation

[Dennis McCarthy / USNO]

******************************************************************************
IGS Electronic Report    Fri Jan 28 11:13:57 PST 1994      Message Number 0751
******************************************************************************

Author: Dennis McCarthy / USNO
Subject: GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     27 January 1994


An updated look at Earth orientation data submitted to the IERS
follows.  Data reduced in the ITRF92 have been used where available. 
Means refer to the ITRF92 for those contributors who have reported
estimates in the ITRF92 (CODE, ESOC, EMR, JPL, and GFZ).  Units are
milliseconds of arc for x and y, and milliseconds of time for
UT1-UTC.


Contributor Data Span Points       Mean          Standard Deviation
                                (NEOS-GPS)
                              x     y  UT1-UTC    x     y  UT1-UTC

Scripps      48780.5   585  -1.82 -1.42          0.61  0.85
             -49367.5

CODE         48792.5   582   0.15 -1.12   0.52   0.68  0.89  1.96
             -49373.5

JPL          48794.5   549   0.02 -1.26          0.63  0.72
             -49374.5

ESOC         48794.5   574  -0.29 -1.71          1.13  1.43
             -49367.5

EMR          48830.5   492  -0.37 -1.31          0.61  0.78
             -49367.5
                       357                0.02               0.86

GFZ          48997.5   375  -0.41 -1.43          0.29  0.40
             -49367.5

NOAA         48988.5   377  -0.77 -1.50          1.06  1.36
             -49375.5

Plots of the residuals are available by FAX to anyone interested.

     Below is the same information as above provided for only the
last thirty data points sent by each contributor.

Contributor Data Span              Mean          Standard Deviation
                                (NEOS-GPS)
                              x     y  UT1-UTC    x     y  UT1-UTC

Scripps      49338.5        -1.48 -1.64          0.69  0.72
             -49367.5

CODE         49344.5        -0.30 -1.08  -2.51   0.27  0.33  0.14
             -49373.5

JPL          49345.5        -0.08 -1.34          0.49  0.48
             -49374.5

ESOC         49338.5        -0.32 -1.54          0.38  0.44
             -49367.5

EMR          49338.5        -0.60 -1.56          0.54  0.74
             -49367.5

             49335.5                     -0.54               0.93
             -49367.5 

GFZ          49338.5        -0.49 -1.28          0.33  0.36
             -49367.5

NOAA         49346.5         0.14 -0.50          0.54  0.94

             -49375.5

--
Dennis D. McCarthy                       dmc @ maia.usno.navy.mil
Chief Earth Orientation Parameters       phone: (202) 653-0066
U.S. Naval Observatory                   fax: (202) 653-0587
Washington, DC 20392-5100