[IGSREPORT-1978] Wk 0816 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Thu Aug 31  7:35:31 PDT 1995      Message Number 1978
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Author: Dennis McCarthy
Subject: Wk 0816 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     31 August 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  1166  -0.73 -0.10          1.02  0.81
             -49948.5

CODE         48792.5  1164   0.40  0.14  -3.11   0.55  0.65  4.37
             -49955.5

JPL          48794.5  1029   0.10 -0.37          0.47  0.45
             -49948.5

             49648.5   295               -0.83               0.76
             -49948.5

ESOC         48794.5  1162   0.15 -0.34          0.88  1.06
             -49955.5

NRCan        48830.5  1080   0.28  0.37          0.53  0.79
             -49955.5
                       932                1.95               2.09

GFZ          48997.5   956  -0.03  0.00          0.38  0.35
             -49948.5

NOAA         48988.5   953  -0.16  0.11          0.93  1.04
             -49955.5

USNO         49676.5   273   0.22 -0.22          1.13  0.81
             -49955.5

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      49919.5         0.46 -0.13          0.35  0.38
             -49948.5

CODE         49926.5         0.46  0.03 -12.58   0.30  0.17  0.18
             -49955.5

JPL          49919.5         0.08  0.06  -1.06   0.36  0.20  0.16
             -49948.5

ESOC         49926.5         0.08 -0.76          0.40  0.26
             -49955.5

NRCan        49926.5         0.29 -0.36   5.47   0.35  0.20  0.15
             -49955.5

GFZ          49919.5        -0.16 -0.25          0.35  0.14
             -49948.5

NOAA         49926.5         0.18 -0.06          0.48  0.29
             -49955.5

USNO         49926.5         0.21 -0.30          0.43  0.31
             -49955.5
--
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>]