[IGSREPORT-3337] Wk 0887 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Thu Jan  9  9:28:47 PST 1997      Message Number 3337
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Author: Dennis McCarthy
Subject: Wk 0887 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     9 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      50416.5        -0.92 -2.11          0.84  1.00
             -50445.5

CODE         50423.5        -0.09  0.09 -20.64   0.13  0.14  0.24
             -50452.5

JPL          50416.5        -0.15 -0.07   1.92   0.14  0.14  0.38
             -50445.5

ESOC         50416.5        -0.30 -0.52          0.20  0.24
             -50445.5

NRCan        50423.5        -0.17 -0.53   8.63   0.17  0.17  0.23
             -50452.5

GFZ          50423.5        -0.25 -0.39          0.13  0.09
             -50452.5

NOAA         50423.5        -0.23 -0.41          0.34  0.30
             -50452.5

USNO         50422.5        -0.45 -0.31          0.24  0.29
             -50451.5

IGS Final    50416.5        -0.18 -0.30          0.11  0.10
             -50445.5

IGS Rapid    50426.5        -0.27 -0.34          0.19  0.27
             -50455.5

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>]