[IGSMAIL-1388] Changes in EMR IGS Processing
Pierre
Pierre
Mon Jul 15 13:11:29 PDT 1996
******************************************************************************
IGS Electronic Mail Mon Jul 15 13:11:29 PDT 1996 Message Number 1388
******************************************************************************
Author: Pierre Tetreault
Subject: Changes in EMR IGS Processing
Subject: Changes in EMR IGS Processing
Dear IGS colleagues,
As of June 30, 1996 the EMR solutions submitted to IGS are performed in
agreement to the following IGS Silver Spring 1996 Workshop recommendations:
1) ITFR94 coordinates and velocities used for the 13 IGS fiducial stations;
2) Diurnal and semi-diurnal EOP terms (Ray model) are applied to the
observations and to the orbits but are not applied to the reported
EOP's. The reported EOP's are linear 24 hour averages.
In addition EMR has begun estimating and reporting Polar Motion (PM) rates
as of June 30, 1996.
The resulting discontinuities in EMR products have been estimated
by processing Wk 859 both without and with the changes and are listed
in Table 1.
Table 1: June 30, 1996 Discontinuities in EMR Products
(ITRF94 to ITRF93)
Solution T1(cm) T2(cm) T3(cm) D(ppb) R1(mas) R2(mas) R3(mas)
(Ypol) (Xpol) (-Ut1)
Stations -2.0 -0.3 -0.4 .4 -1.41 -.84 -.72
sigma .1 .1 .1 .1 .05 .05 .03
Orbits -1.2 0.5 -0.2 .0 -1.36 -.80 -.81
sigmas .04 .04 .04 .04 .06 .08 .10
EOP -1.41 -.88 -.76
sigma .05 .07 .21
Pierre Tetreault
--
EMR IGS Analysis Centre
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: pierre at geod.emr.ca
[Mailed From: Pierre Tetreault <pierre at geod.emr.ca>]
More information about the IGSMail
mailing list