[IGSREPORT-171] Preliminary look at GPS Earth orientation

[Dennis McCarthy]

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IGS Electronic Report     17-MAR-1993 09:06:08       Message Number 171
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From:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
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Date:     15 March 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   229  -1.57 -0.82          0.66  0.67
             -49045.5

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   249  -0.51 -0.15  -3.24   0.96  0.86  1.07
(ITRF91)     -49048.5

JPL          48794.5   213  -0.80  0.05          0.80  0.68
             -49038.5

GFZ          48795.0   107  -2.33 -1.99          1.13  1.12
             -48925.5

ESOC         48794.5   252  -1.14 -0.87          1.43  1.87
             -49045.5

EMR          48838.5   162  -0.97  0.32          1.06  0.73
             -49045.5
                        98                0.22               1.32


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

Regards,

Dennis McCarthy
  dmc @ maia.usno.navy.mil