[IGSREPORT-2968] Wk 0870 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Thu Sep 12 10:57:23 PDT 1996      Message Number 2968
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Author: Dennis McCarthy
Subject: Wk 0870 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     12 September 1996


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  1525  -0.51  0.09          1.00  0.71
             -50326.5

CODE         48792.5  1542   0.21  0.25  -6.53   0.42  0.58  7.15
             -50333.5

JPL          48794.5  1407   0.04 -0.10          0.32  0.37
             -50326.5

             49648.5   673               -1.24               0.95
             -50326.5

ESOC         48794.5  1532   0.12 -0.14          0.73  0.93
             -50326.5

NRCan        48830.5  1457   0.25  0.34          0.40  0.82
             -50333.5
                      1309                3.26               2.72

GFZ          48997.5  1341   0.01  0.14          0.27  0.31
             -50333.5

NOAA         48988.5  1330  -0.12  0.26          0.80  0.89
             -50332.5

USNO         49676.5   650   0.19 -0.08          0.31  0.35
             -50333.5

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      50297.5         0.07 -0.35          0.17  0.37
             -50326.5

CODE         50304.5         0.23 -0.16 -21.41   0.07  0.19  0.17
             -50333.5

JPL          50297.5         0.29 -0.24  -0.30   0.09  0.16  0.26
             -50326.5

ESOC         50296.5         0.28 -0.66          0.24  0.21
             -50326.5

NRCan        50304.5         0.21 -0.56   7.05   0.13  0.18  0.09
             -50333.5

GFZ          50304.5         0.07 -0.57          0.11  0.15
             -50333.5

NOAA         50303.5        -0.02 -0.23          0.36  0.39
             -50332.5

USNO         50304.5        -0.44 -0.61          0.39  0.32
             -50333.5
--
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>]