[IGSREPORT-0684] GPS Earth Orientation

[Dennis]

******************************************************************************
IGS Electronic Report    Thu Dec 30 11:45:20 PST 1993      Message Number 0684
******************************************************************************

Author: Dennis McCarthy / USNO
Subject: GPS Earth Orientation

>From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     30 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   550  -1.86 -1.42          0.68  0.86
             -49332.5

CODE(ITRF91) 48792.5   554  -0.73 -1.73  -4.79   0.80  0.95  1.88
             -49345.5

JPL          48794.5   507  -0.82 -1.29          0.70  0.73
             -49339.5

ESOC         48794.5   553  -1.05 -1.84          1.18  1.45
             -49346.5

EMR          48830.5   471  -1.29 -0.97          0.71  0.78
             -49346.5
                       338                0.02               0.87

GFZ          48997.5   354  -0.81 -0.82          0.42  0.40
             -49346.5

NOAA         48988.5   350  -0.85 -1.57          1.11  1.36
             -49348.5

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      49303.5        -0.36  1.12          0.39  0.57
             -49332.5

CODE(ITRF91) 49316.5        -0.13  0.51  -3.09   0.55  0.36  0.19
             -49345.5

JPL          49303.5        -0.18 -0.04          0.39  0.38
             -49339.5

ESOC         49317.5        -0.12  0.38          0.56  0.56
             -49332.5

EMR          49317.5        -0.20 -0.13          0.56  0.51
             -49346.5

             49313.5                      0.21               1.47
             -49346.5 

GFZ          49317.5        -0.08  0.24          0.38  0.27
             -49346.5

NOAA         49319.5         1.11  1.24          0.74  0.83
             -49348.5

--
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