[IGSREPORT-0875] GPS Earth Orientation

[Dennis]

******************************************************************************
IGS Electronic Report    Thu Mar 31 12:36:16 PST 1994      Message Number 0875
******************************************************************************

Author: Dennis McCarthy / USNO
Subject: GPS Earth Orientation

>From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
Date:     31 March 1994


An updated look at Earth orientation data submitted to the IERS
follows.  Data reduced in the ITRF92 have been used where available.
Means refer to the ITRF92 for those contributors who have reported
estimates in the ITRF92 (CODE, ESOC, EMR, JPL, and GFZ).  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   648  -1.67 -1.55          0.72  0.92
             -49430.5

CODE         48792.5   643   0.17 -1.17   0.15   0.67  0.84  2.20
             -49434.5

JPL          48794.5   605   0.03 -1.33          0.63  0.68
             -49430.5

ESOC         48794.5   637  -0.22 -1.74          1.09  1.34
             -49430.5

NRCan        48830.5   562  -0.01 -0.73          0.60  0.81
             -49437.5
                       422                0.05               0.80

GFZ          48997.5   445  -0.37 -1.53          0.33  0.41
             -49437.5

NOAA         48988.5   438  -0.57 -1.58          1.13  1.32
             -49436.5

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      49401.5        -0.58 -3.00          0.41  0.31
             -49430.5

CODE         49405.5        -0.01 -1.77  -3.80   0.37  0.29  0.28
             -49434.5

JPL          49401.5        -0.25 -2.09          0.40  0.36
             -49430.5

ESOC         49401.5         0.09 -2.25          0.38  0.30
             -49430.5

NRCan        49408.5        -0.06 -1.71          0.42  0.38
             -49437.5

             49406.5                      0.04               0.06
             -49437.5

GFZ          49408.5        -0.53 -2.24          0.37  0.25
             -49437.5

NOAA         49407.5         0.14 -2.26          1.09  1.30
             -49436.5
--
Dennis D. McCarthy                       dmc at maia.usno.navy.mil
Chief Earth Orientation Parameters       phone: (202) 653-0066
U.S. Naval Observatory                   fax: (202) 653-0587
Washington, DC 20392-5100