Subject: [IGSREPORT-2100] Wk 0823 GPS Earth Orientation
From: Dennis McCarthy
Date: Thu, 19 Oct 1995 7:24:12 PDT

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IGS Electronic Report    Thu Oct 19  7:24:12 PDT 1995      Message Number 2100
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Author: Dennis McCarthy
Subject: Wk 0823 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     19 October 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 all contributors.  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  1214  -0.76 -0.07          0.90  0.78
             -49997.5

CODE         48792.5  1206   0.33  0.15  -3.46   0.46  0.59  4.70
             -49997.5

JPL          48794.5  1078   0.02 -0.34          0.33  0.38
             -49997.5

             49648.5   344               -0.82               0.71
             -49997.5

ESOC         48794.5  1211   0.07 -0.35          0.81  1.03
             -50004.5

NRCan        48830.5  1129   0.21  0.35          0.44  0.78
             -50004.5
                       981                2.14               2.19

GFZ          48997.5  1012  -0.11  0.02          0.24  0.28
             -50004.5

NOAA         48988.5  1003  -0.23  0.13          0.87  0.99
             -50005.5

USNO         49676.5   318   0.08 -0.28          0.31  0.34
             -50004.5

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      49968.5         0.16  0.12          0.57  0.70
             -49997.5

CODE         49968.5         0.30  0.03 -13.75   0.13  0.15  0.23
             -49997.5

JPL          49968.5         0.10 -0.02  -0.78   0.23  0.15  0.28
             -49997.5

ESOC         49975.5        -0.06 -0.93          0.28  0.24
             -50004.5

NRCan        49975.5         0.18 -0.37   5.65   0.27  0.27  0.17
             -50004.5

GFZ          49975.5         0.05 -0.08          0.23  0.15
             -50004.5

NOAA         49976.5         0.10  0.04          0.34  0.31
             -50005.5

USNO         49971.5        -0.19 -0.18          0.37  0.27
             -50004.5
--
Dennis D. McCarthy                       [email-masked]
Head, Earth Orientation Department       phone: (202) 653-0066
U.S. Naval Observatory                   fax: (202) 653-0587
Washington, DC 20392-5420

[Mailed From: Dennis McCarthy <[email-masked]>]