[IGSREPORT-3073] Wk 0875 GPS Earth Orientation

[Dennis]

******************************************************************************
IGS Electronic Report    Thu Oct 17 11:45:45 PDT 1996      Message Number 3073
******************************************************************************

Author: Dennis McCarthy
Subject: Wk 0875 GPS Earth Orientation

From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     17 October 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  1560  -0.50  0.09          0.99  0.71
             -50361.5

CODE         48792.5  1577   0.21  0.24  -6.87   0.42  0.57  7.42
             -50368.5

JPL          48794.5  1442   0.05 -0.10          0.32  0.36
             -50361.5

             49648.5   708               -1.18               0.97
             -50361.5

ESOC         48794.5  1567   0.12 -0.15          0.72  0.93
             -50361.5

NRCan        48830.5  1492   0.25  0.32          0.40  0.82
             -50368.5
                      1344                3.36               2.76

GFZ          48997.5  1369   0.01  0.13          0.27  0.31
             -50361.5

NOAA         48988.5  1364  -0.11  0.24          0.79  0.89
             -50367.5

USNO         49676.5   685   0.19 -0.10          0.31  0.35
             -50368.5

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      50332.5         0.16 -0.25          0.21  0.23
             -50361.5

CODE         50339.5         0.22 -0.15 -21.80   0.08  0.19  0.16
             -50368.5

JPL          50332.5         0.31 -0.34   0.12   0.17  0.18  0.22
             -50361.5

ESOC         50332.5         0.25 -0.70          0.20  0.24
             -50361.5

NRCan        50339.5         0.29 -0.58   7.40   0.14  0.21  0.15
             -50368.5

GFZ          50332.5         0.05 -0.46          0.10  0.13
             -50361.5

NOAA         50338.5         0.22 -0.67          0.30  0.38
             -50367.5

USNO         50339.5         0.00 -0.33          0.15  0.28
             -50368.5
--
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>]