[IGSREPORT-3845] WK 0909 GPS Earth Orientation

[Dennis]

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IGS Electronic Report    Mon Jun 16 13:57:19 PDT 1997      Message Number 3845
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Author: Dennis McCarthy
Subject: WK 0909 GPS Earth Orientation

From: Dennis McCarthy
Subject: Earth Orientation Contributions to IERS Bulletin A
Date: 12 Jun 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.    50608.66    22               -.006                .025

NEOS VLBI    50603.25     5   -.01  -.06   .002    .15   .09   .010

JPL VLBI     50603.21     7                .032                .074

CSR SLR      50608.88    11   -.09   .00  -.039    .43   .25   .098

TUD SLR      50577.00     7    .27  -.05           .29   .32

IAA SLR           .00     0    .00   .00           .00   .00

UT LLR       50596.10     9                .012                .123

IGS Final    50599.50    30    .03   .04           .08   .09

IGS Rapid    50609.50    10    .02   .00           .06   .13

             50609.50     1               -.015                 

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           50585.5    30   -.10  -.10           .16   .14

CODE          50608.5    30   -.31  -.05 -17.85    .17   .18    .20

JPL           50592.5    30   -.24  -.07  -4.44    .13   .12    .12

ESOC          50599.5    30   -.25  -.13           .18   .18

NRCan         50606.5    30    .10  -.72  10.43   1.06   .67    .21

GFZ           50599.5    30   -.28  -.13           .12   .13

NOAA          50607.5    30   -.53  -.07           .42   .42

USNO          50609.5    30   -.45  -.66           .21   .30

IGS Final     50599.5    30   -.27  -.13    .00    .08   .09    .02

IGS Rapid     50609.5    30   -.33  -.21   -.21    .22   .19    .37

IERS Central Bureau Series:

Bulletin B    50569.     30    .00  -.01   .000    .13   .13   .015

97C04         50608.     30   -.01  -.08  -.042    .17   .20   .070


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


[Mailed From: msc at Maia.usno.navy.mil]