[IGSREPORT-140] Preliminary look at GPS Earth orientation

[Dennis]

>From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
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Date:     16 February 1993


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   201  -1.59 -1.00          0.66  0.50
             -49017.5     

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   221  -0.41 -0.09  -3.20   0.94  0.81  1.12 
(ITRF91)     -49020.5

JPL          48794.5   185  -0.83  0.05          0.79  0.70 
             -49010.5

GFZ          48795.0   107  -2.33 -2.01          1.13  1.12
             -48925.5

ESOC         48794.5   231  -1.12 -0.80          1.46  1.88
             -49024.5

EMR          48838.5   141  -0.85  0.26          1.08  0.74
             -49024.5
                        82                0.23               1.44


Plots are available by FAX to anyone interested.

Regards,

Dennis McCarthy
  dmc at maia.usno.navy.mil