[IGSREPORT-3649] WK 0901 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Thu Apr 17 11:51:47 PDT 1997      Message Number 3649
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Author: Dennis McCarthy
Subject: WK 0901 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     17 April 1997


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      50514.5        -0.24 -0.13          0.13  0.16
             -50543.5

CODE         50521.5        -0.37  0.01 -18.56   0.09  0.20  0.24
             -50550.5

JPL          50514.5        -0.17 -0.13  -3.44   0.11  0.25  0.24
             -50543.5

ESOC         50514.5        -0.23 -0.37          0.18  0.32
             -50543.5

NRCan        50521.5         0.00 -0.38  10.31   0.23  0.19  0.11
             -50550.5

GFZ          50514.5        -0.33 -0.23          0.10  0.17
             -50543.5

NOAA         50521.5        -0.22 -0.18          0.47  0.68
             -50550.5

USNO         50522.5        -0.46 -0.89          0.30  0.40
             -50551.5

IGS Final    50514.5        -0.25 -0.19   0.00   0.08  0.14  0.04
             -50543.5

IGS Rapid    50524.5        -0.29 -0.13  -0.06   0.20  0.29  0.20
             -50553.5

Plots of the residuals are available by FAX or through the world wide
web at http://maia.usno.navy.mil/plots.html 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>]