[IGSREPORT-243] Preliminary look at GPS Earth orientation

[Dennis]

***********************************************************************
IGS Electronic Report     30-APR-1993 10:12:15       Message Number 243
***********************************************************************
 

>From :  Dennis McCarthy
Subj.:  Preliminary look at GPS Earth orientation
---------------------------------------------------

An updated look at Earth orientation data submitted to the IERS
follows.  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
U. of Texas  48794.5    76  -1.89 -3.11          0.82  0.63
             -48880.5

Scripps      48780.5   277  -1.59 -0.68          0.69  0.66
             -49094.5

U. of Berne  48792.5     8  -0.89  1.21  -0.28   1.52  1.88  0.13
 (ITRF90)    -48799.5

U. of Berne  48800.5   299  -0.61 -0.37  -3.38   0.99  0.95  1.03
 (ITRF91)    -49098.5

JPL          48794.5   262  -0.78 -0.07          0.80  0.67
             -49087.5

GFZ          48795.0   107  -2.33 -1.99          1.13  1.12
             -48925.5

ESOC         48794.5   294  -1.15 -0.98          1.40  1.82
             -49087.5

EMR          48830.5   219  -1.15  0.49          0.88  0.93
             -49097.5
                       166                0.11               1.02

GFZ          48997.5    91   1.99 -1.56          0.63  0.47
(New Series) -49087.5

NOAA         48988.5    98  -1.29 -1.79          1.03  1.04
             -49098.5

Plots of the residuals of the most recent 100 days of data are
available by FAX to anyone interested.

Regards,

Dennis McCarthy
  dmc at maia.usno.navy.mil