[IGSREPORT-1490] Wk 0783 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Thu Jan 12  9:57:48 PST 1995      Message Number 1490
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Author: Dennis McCarthy
Subject: Wk 0783 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     12 January 1995


An updated look at Earth orientation data submitted to the IERS
follows.  Data reduced in the ITRF93 have been used where available. 
Means refer to the ITRF93 for those contributors who have reported
estimates in the ITRF93 (SIO, CODE, NRCan, GFZ, and NOAA).  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   942  -1.03  0.01          0.82  0.83
             -49724.5

CODE         48792.5   932   0.43  0.18  -1.45   0.58  0.72  3.04
             -49723.5

JPL          48794.5   892   0.40  0.13          0.57  0.60
             -49717.5

ESOC         48794.5   924   0.17 -0.23          0.95  1.14
             -49717.5

NRCan        48830.5   849   0.27  0.56          0.53  0.77
             -49724.5
                       702                1.11               1.68

GFZ          48997.5   732  -0.04  0.08          0.34  0.35
             -49724.5

NOAA         48988.5   724  -0.20  0.21          1.01  1.15
             -49726.5

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      49695.5        -0.68  0.16          0.34  0.58
             -49724.5

CODE         49694.5         0.36 -0.10  -6.50   0.36  0.35  0.11
             -49723.5

JPL          49688.5         0.65  0.08          0.31  0.27
             -49717.5

ESOC         49688.5         0.45 -0.41          0.52  0.64
             -49717.5

NRCan        49695.5         0.32 -0.42          0.36  0.47
             -49724.5

             49695.5                      4.12               0.12
             -49724.5 

GFZ          49695.5         0.05  0.02          0.25  0.36
             -49724.5

NOAA         49697.5        -0.48 -0.45          0.49  0.50
             -49726.5
--
Dennis D. McCarthy                       dmc at maia.usno.navy.mil
Head, Earth Orientation Department       phone: (202) 653-0066
U.S. Naval Observatory                   fax: (202) 653-0587
Washington, DC 20392-5420


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