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dorisreport             16-Jan-2014 21:02:50 Message No 3536
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Author: "Lemoine, Frank G. (GSFC-6980)" <frank.g.lemoine@nasa.gov>
Subject: Delivery of the GSCWD23 SINEX files (1993 - 2013)




This report documents the delivery of the GSCWD23 SINEX series to
the IDS data centers.  We have completed a delivery of the entire
time series of DORIS data based on the reprocessing of data
to the following satellites:

TOPEX, SPOT-2, SPOT-3, SPOT-4, Envisat, SPOT-5, Jason-2,
Cryosat-2.

The new SINEX series, expressed in NEQ format, contain
one primary update with respect to the previous series
(wd21) and two updates with respect to the antecedent
series (wd20).

The primary update is the application of weekly solutions
of time-variable gravity based on SLR+DORIS tracking
to 18 satellites. These 18 satellites were
Starlette, Stella, Lageos-1, Lageos-2, Ajisai,
TOPEX, SPOT-2, SPOT-3, SPOT-4, Envisat,
Jason-2, Cryosat-2, Larets, Westpac, LARES,
Blits, Etalon1, Etalon2.  

The base static model (for L >5) remains GOCO2S; the
new TVG solutions apply only for L=2,5.

We observe a reduction in the WRMS with respect
to both wd21, and wd20, and in addition we see
improvements in the Tx and Ty parameters, especially
following 2002.

For SPOT-5 the wd23 series uses the SAA-corrected
files supplied by H. Capdeville.

As with wd20, and wd21, the wd23 series applies
the IERS2010 standards for the modelling of the
mean pole, and applies the IERS2010 definition
for the background model of C21, S21.

As with wd21, wd23 applies the phase map
corrections for the Starec and Alcatel antennae
that were supplied by the CNES.

The wd23 series was developed as part of
the NASA GSFC contribution to the DORIS
combination for ITRF2013.

Contacts for further information:
Frank Lemoine (Frank.G.Lemoine@nasa.gov)
Douglas Chinn (Douglas.S.Chinn@nasa.gov)


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