[IGSREPORT-3364] Wk 0888 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Fri Jan 17  5:45:45 PST 1997      Message Number 3364
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Author: Dennis McCarthy
Subject: Wk 0888 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     16 January 1996


An updated look at Earth orientation data submitted to the IERS
follows.  All GPS data are assumed to have adopted ITRF94 and so all
statistics are referred to that reference system.  Units are
milliseconds of arc for x and y, and milliseconds of time for
UT1-UTC.

     Below is the information 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      50423.5        -1.22 -1.76          0.76  1.19
             -50452.5

CODE         50429.5        -0.10  0.05 -20.51   0.18  0.24  0.20
             -50458.5

JPL          50423.5        -0.14  0.01   1.55   0.15  0.11  0.57
             -50452.5

ESOC         50423.5        -0.30 -0.47          0.20  0.25
             -50452.5

NRCan        50430.5        -0.21 -0.64   8.82   0.19  0.33  0.25
             -50459.5

GFZ          50423.5        -0.25 -0.35          0.14  0.10
             -50452.5

NOAA         50430.5        -0.31 -0.47          0.30  0.41
             -50459.5

USNO         50431.5        -0.53 -0.43          0.30  0.40
             -50460.5

IGS Final    50423.5        -0.19 -0.22          0.13  0.12
             -50452.5

IGS Rapid    50433.5        -0.28 -0.45          0.25  0.37
             -50462.5

Plots of the residuals are available by FAX to anyone interested.
--
Dennis D. McCarthy                       dmc at maia.usno.navy.mil
Director, Directorate of Time            phone: (202) 762-1837
U.S. Naval Observatory                   fax: (202) 762-1563
Washington, DC 20392-5420


[Mailed From: Dennis McCarthy <dmc at Maia.usno.navy.mil>]