[IGSREPORT-3760] Wk 0906 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Wed May 21 13:11:07 PDT 1997      Message Number 3760
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Author: Dennis McCarthy
Subject: Wk 0906 GPS Earth Orientation

From: Dennis McCarthy
Subject: Earth Orientation Contributions to IERS Bulletin A
Date: 20 May 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 Intesensives series whose UT1-UTC are not corrected.

Below are the mean and standard deviation of each submission compared
with the Rapid Service 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.    50583.73    21               -.005                .024

NEOS VLBI    50582.25     5    .13  -.11   .001    .16   .13   .004

JPL VLBI     50573.29    10               -.094                .117

CSR SLR      50579.75    11    .04  -.06   .040    .35   .24   .083

TUD SLR      50547.00    10    .14  -.13           .55   .21

IAA SLR      50584.00    30   -.46   .07           .43   .33

UT LLR       50567.48    11                .079                .294

IGS Final    50578.50    30    .03   .06           .09   .12

IGS Rapid    50586.50     8   -.07   .05           .12   .15

             50586.50     3               -.010                .024

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           50578.5    30   -.05  -.07           .13   .15

CODE          50583.5    30   -.36   .04 -18.16    .13   .15    .08

JPL           50578.5    30   -.20  -.11  -4.17    .19   .21    .23

ESOC          50578.5    30   -.24  -.17           .18   .20

NRCan         50578.5    30   -.07  -.29  10.17    .25   .27    .07

GFZ           50578.5    30   -.24  -.10           .17   .18

NOAA          50582.5    30   -.43  -.03           .53   .48

USNO          50586.5    30   -.40  -.51           .56   .25

IGS Final     50578.5    30   -.26  -.11   -.02    .10   .12    .02

IGS Rapid     50586.5    30   -.38  -.13    .09    .20   .21    .22

IERS Central Bureau Series:

Bulletin B    50539.     30   -.06  -.01  -.010    .11   .14   .022

97C04         50581.     30    .02  -.03  -.009    .17   .12   .023


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>]