[IGSREPORT-2896] Wk 0866 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Thu Aug 15 10:34:58 PDT 1996      Message Number 2896
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Author: Dennis McCarthy
Subject: Wk 0866 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     15 August 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  1490  -0.52  0.10          1.00  0.72
             -50291.5

CODE         48792.5  1514   0.21  0.26  -6.26   0.43  0.58  6.92
             -50305.5

JPL          48794.5  1379   0.03 -0.09          0.32  0.37
             -50298.5

             49648.5   645               -1.29               0.94
             -50298.5

ESOC         48794.5  1505   0.12 -0.13          0.73  0.94
             -50298.5

NRCan        48830.5  1422   0.25  0.36          0.41  0.81
             -50298.5
                      1274                3.15               2.69

GFZ          48997.5  1313   0.01  0.15          0.27  0.29
             -50305.5

NOAA         48988.5  1305  -0.12  0.27          0.80  0.90
             -50307.5

USNO         49676.5   623   0.18 -0.06          0.30  0.33
             -50305.5

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      50255.5         0.17 -0.38          0.14  0.20
             -50291.5

CODE         50276.5         0.30  0.07 -20.68   0.08  0.17  0.26
             -50305.5

JPL          50269.5         0.17 -0.49  -1.93   0.11  0.13  0.73
             -50298.5

ESOC         50269.5         0.41 -0.72          0.15  0.22
             -50298.5

NRCan        50269.5         0.14 -0.84   6.89   0.18  0.21  0.11
             -50298.5

GFZ          50276.5         0.26 -0.58          0.13  0.14
             -50305.5

NOAA         50278.5         0.20 -0.37          0.31  0.41
             -50307.5

USNO         50276.5        -0.10 -0.38          0.22  0.29
             -50305.5
--
Dennis D. McCarthy                       dmc at maia.usno.navy.mil
Head, Earth Orientation Department       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>]