[IGSREPORT-0651] GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Mon Dec 13  8:03:22 PST 1993      Message Number 0651
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Author: Dennis McCarthy / USNO
Subject: GPS Earth Orientation

>From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     9 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  -1.83 -1.45          0.67  0.85
             -49311.5

CODE(ITRF91) 48800.5   523  -0.70 -1.78  -4.73   0.79  0.90  1.74
             -49322.5

JPL          48794.5   479  -0.79 -1.29          0.71  0.75
             -49304.5

ESOC         48794.5   525  -1.02 -1.86          1.20  1.48
             -49318.5

EMR          48830.5   450  -1.25 -0.97          0.71  0.79
             -49325.5
                       320                0.05               0.83

GFZ          48997.5   326  -0.76 -0.84          0.41  0.40
             -49318.5

NOAA         48988.5   320  -0.88 -1.68          1.11  1.34
             -49325.5

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  1.16          0.42  0.71
             -49311.5

CODE(ITRF91) 49293.5        -0.09  0.37  -3.18   0.44  0.57  0.14
             -49322.5

JPL          49275.5        -0.31 -0.30          0.58  0.46
             -49304.5

ESOC         49289.5        -0.40  0.36          0.54  0.47
             -49318.5

EMR          49296.5        -0.25 -0.20          0.57  0.53
             -49325.5

             49279.5                      0.69               0.83
             -49325.5 

GFZ          49289.5        -0.23  0.10          0.34  0.33
             -49318.5

NOAA         49296.5         1.00  0.19          0.75  0.93
             -49325.5

--
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