[IGSREPORT-2990] Wk 0871 GPS Earth Orientation

[Dennis]

******************************************************************************
IGS Electronic Report    Fri Sep 20  6:01:45 PDT 1996      Message Number 2990
******************************************************************************

Author: Dennis McCarthy
Subject: Wk 0871 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     19 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  1532  -0.51  0.09          1.00  0.71
             -50333.5

CODE         48792.5  1549   0.21  0.25  -6.60   0.42  0.57  7.21
             -50340.5

JPL          48794.5  1414   0.04 -0.10          0.32  0.37
             -50333.5

             49648.5   680               -1.23               0.95
             -50333.5

ESOC         48794.5  1539   0.12 -0.14          0.72  0.93
             -50333.5

NRCan        48830.5  1464   0.25  0.34          0.40  0.82
             -50340.5
                      1316                3.28               2.73

GFZ          48997.5  1341   0.01  0.14          0.27  0.31
             -50333.5

NOAA         48988.5  1337  -0.12  0.25          0.80  0.89
             -50339.5

USNO         49676.5   657   0.19 -0.09          0.31  0.35
             -50340.5

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      50304.5         0.05 -0.33          0.16  0.37
             -50333.5

CODE         50311.5         0.20 -0.15 -21.55   0.10  0.16  0.22
             -50340.5

JPL          50304.5         0.30 -0.25  -0.18   0.08  0.14  0.21
             -50333.5

ESOC         50303.5         0.21 -0.68          0.24  0.20
             -50333.5

NRCan        50311.5         0.22 -0.52   7.06   0.14  0.18  0.07
             -50340.5

GFZ          50304.5         0.06 -0.58          0.12  0.15
             -50333.5

NOAA         50310.5         0.00 -0.25          0.34  0.36
             -50339.5

USNO         50311.5         0.37 -0.62          0.44  0.30
             -50340.5
--
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>]