[IGSREPORT-4263] Wk 0928 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Fri Oct 24  6:08:33 PDT 1997      Message Number 4263
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Author: Dennis McCarthy
Subject: Wk 0928 GPS Earth Orientation

From: Dennis McCarthy
Subject: Earth Orientation Contributions to IERS Bulletin A
Date: 23 Oct 97


An updated look at Earth orientation data submitted to the IERS
follows.  All data are aligned to the system defined by ITRF94 and
the current ICRF by estimating and removing mean bias, rate, annual
and semiannual terms.  The only exception to this is the NEOS VLBI
and the NEOS Intensives series whose UT1-UTC are not corrected.

Below are the mean and standard deviation of each submission
included in the Rapid Service combination compared with the
combination for the last 30 days.  Units are milliseconds of arc
for x and y, and milliseconds of time for UT1-UTC.

Contributor   Latest      #         Mean          Standard Deviation
               Day               (NEOS-series)
                                x     y  UT1-UTC    x     y  UT1-UTC

NEOS Int.    50741.63    21                .017                .026

NEOS VLBI    50736.25     5    .11  -.06  -.008    .09   .07   .006

JPL VLBI     50721.86     8               -.007                .133

CSR SLR      50733.18    10   -.21   .10   .018    .21   .13   .030

TUD SLR      50610.00     3   -.14   .04           .48   .30

UT LLR       50627.17    10                .003                .083

IGS Final    50732.50    30    .02  -.01           .07   .10

IGS Rapid    50742.50    10    .00   .00           .07   .02

             50742.50     1               -.026                 ---

For comparison, the mean and standard deviations of other related
series are listed below for the last 30 days.  Units are milliseconds
of arc for x and y, and milliseconds of time for UT1-UTC

Series        Latest      #         Mean          Standard Deviation
               Day               (NEOS-series)
                                x     y  UT1-UTC    x     y  UT1-UTC

SIO           50732.5    30   -.45  -.22           .16   .24

CODE          50738.5    30   -.42   .19 -16.41    .12   .26    .17

JPL           50732.5    30   -.06  -.10   1.90    .12   .16    .44

ESOC          50732.5    30   -.04  -.49           .15   .24

NRCan         50739.5    30   -.03  -.51  11.05    .21   .21    .04

GFZ           50739.5    30   -.39  -.30   -.08    .18   .18    .07

NOAA          50740.5    30   -.69  -.32           .38   .42

USNO          50738.5    30   -.39  -.57           .32   .25

USNO GPS UT1  50741.5    29                -.01                 .06

IGS Final     50732.5    30   -.27  -.19   -.01    .08   .10    .02

IGS Rapid     50742.5    30   -.41  -.35    .05    .18   .21    .07

IERS Central Bureau Series:

Bulletin B    50694.     30   -.01   .00   .007    .12   .15   .042

97C04         50743.     30   -.03   .06   .004    .23   .23   .027


Plots of the residuals are available through the world wide web at,
http://maia.usno.navy.mil/plots.html to anyone interested.
--
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>]