[IGSREPORT-3554] Wk 0897 GPS Earth Orientation

[Dennis]

******************************************************************************
IGS Electronic Report    Thu Mar 20  7:11:39 PST 1997      Message Number 3554
******************************************************************************

Author: Dennis McCarthy
Subject: Wk 0897 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     20 March 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      50486.5        -0.27 -0.16          0.14  0.11
             -50515.5

CODE         50493.5        -0.34  0.07 -19.29   0.10  0.15  0.16
             -50522.5

JPL          50486.5        -0.12 -0.22  -2.21   0.15  0.13  0.39
             -50515.5

ESOC         50486.5        -0.38 -0.57          0.16  0.22
             -50515.5

NRCan        50493.5        -0.10 -0.55  10.51   0.19  0.16  0.06
             -50522.5

GFZ          50486.5        -0.20 -0.20          0.14  0.08
             -50515.5

NOAA         50493.5        -0.62 -0.33          0.28  0.44
             -50522.5

USNO         50493.5        -0.51 -0.84          0.34  0.61
             -50522.5

IGS Final    50486.5        -0.25 -0.24  -0.06   0.09  0.06  0.02
             -50515.5

IGS Rapid    50496.5        -0.28 -0.34  -0.19   0.18  0.24  0.19
             -50525.5

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>]