******************************************************************************
dorisreport             22-Nov-2013 22:37:11 Message No 3496
******************************************************************************


Author: Frank Lemoine <Frank.G.Lemoine@nasa.gov>
Subject: Update of gscwd20 SINEX series. Extended to June 2013.


Dear Colleagues:

We have updated the SINEX series GSCWD20, first discussed in DORISREPORT 3453, 
September 30, 2013.

We have completely redelivered the series and extended it to June 2013.
The solutions submitted for 2013 use the SPOT-5 modified DORIS files that have 
been corrected for the SAA effect. This delivery contains 1070 files from 
January 1993 to June 2013.

DORISREPORT 3453 gives a summary of the changes of this operational series 
with respect to its antecedent (gscwd18). It will remain the operational 
series for the foreseeable future.
As a reminder, this series applies the frequency corrections for some DORIS 
sites.
This affects primarily the data since 2002 and removes the spurious jumps and 
drifts that sporadically affected some stations in the previous series, i 
including the previous submission for ITRF2008.
This series also has background modelling that is consistent with IERS2010, 
with respect to the modelling of the pole and the solid pole tide. (e.g. See 
Table 7.7, pp115 of the IERS Conventions (2010), Petit and Luzum). Other 
changes and updates are discussed in DORISREPORT 3453.

With respect to the previous delivery, we found some anomalies in the 
definition of the  offsets for some of the satellites - so although in 
principle it should not have affected the results, we thought it best to 
recompute and resubmit all the files.

This series will serve as a clean baseline to measure the impact of the 
application of the phase law for the DORIS Alcatel and Starec antennae, whose 
application was agreed by the IDS AWG for inclusion in their contribution to 
ITRF2013.

Contact information for any questions

Frank Lemoine, GSFC/NASA Greenbelt, MD USA frank.g.lemoine@nasa.gov

Douglas Chinn, SGT Inc., Greenbelt MD USA douglas.s.chinn@nasa.gov