[IGSREPORT-633] Preliminary look at GPS Earth orientation

***********************************************************************
IGS Electronic Report      3-DEC-1993 09:41:45       Message Number 633
***********************************************************************
 

Author : Dennis McCarthy
Subject: Preliminary look at GPS Earth orientation
--------------------------------------------------

Date:     2 December 1993


An updated look at Earth orientation data submitted to the IERS
follows.  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   529  -1.82 -1.46          0.67  0.84
             -49311.5

CODE(ITRF91) 48800.5   517  -0.70 -1.79  -4.69   0.80  0.91  1.71
             -49316.5

JPL          48794.5   465  -0.78 -1.28          0.71  0.76
             -49290.5

ESOC         48794.5   518  -1.02 -1.87          1.21  1.49
             -49311.5

EMR          48830.5   443  -1.25 -0.96          0.71  0.79
             -49318.5
                       314                0.02               0.81

GFZ          48997.5   319  -0.77 -0.85          0.41  0.40
             -49311.5

NOAA         48988.5   314  -0.91 -1.69          1.10  1.34
             -49319.5

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      49282.5        -0.50  1.10          0.44  0.69
             -49311.5

CODE(ITRF91) 49287.5        -0.16  0.26  -3.09   0.43  0.59  0.19
             -49316.5

JPL          49261.5        -0.33 -0.29          0.48  0.44
             -49290.5

ESOC         49282.5        -0.56  0.29          0.52  0.51
             -49311.5

EMR          49289.5        -0.32 -0.01          0.52  0.57
             -49318.5

             49272.5                      0.31               0.75
             -49318.5 

GFZ          49282.5        -0.27  0.05          0.37  0.36
             -49311.5

NOAA         49290.5         0.85  0.04          0.74  0.70
             -49319.5

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