[IGSREPORT-3305] Wk 0885 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Mon Dec 30 12:04:45 PST 1996      Message Number 3305
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Author: Dennis McCarthy
Subject: Wk 0885 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     26 December 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  1630  -0.47  0.08          0.98  0.73
             -50431.5

CODE         48792.5  1646   0.22  0.25  -7.47   0.41  0.56  7.80
             -50437.5

JPL          48794.5  1512   0.07 -0.09          0.32  0.35
             -50431.5

             49648.5   778               -0.90               1.31
             -50431.5

ESOC         48794.5  1637   0.13 -0.15          0.71  0.90
             -50431.5

NRCan        48830.5  1561   0.27  0.29          0.40  0.81
             -50437.5
                      1413                3.61               2.90

GFZ          48997.5  1446   0.03  0.12          0.27  0.30
             -50438.5

NOAA         48988.5  1434  -0.09  0.21          0.78  0.89
             -50438.5

USNO         49676.5   755   0.18 -0.07          0.31  0.33
             -50438.5

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      50402.5        -0.03 -0.89          0.76  1.34
             -50431.5

CODE         50408.5         0.42  0.18 -20.97   0.17  0.15  0.15
             -50437.5

JPL          50402.5         0.44  0.05   2.43   0.16  0.16  0.26
             -50431.5

ESOC         50402.5         0.36 -0.44          0.23  0.26
             -50431.5

NRCan        50408.5         0.56 -0.41   8.48   0.20  0.21  0.12
             -50437.5

GFZ          50409.5         0.36 -0.26          0.12  0.11
             -50438.5

NOAA         50409.5         0.38 -0.37          0.38  0.33
             -50438.5

USNO         50409.5         0.19 -0.10          0.28  0.33
             -50438.5
--
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>]