[IGSMAIL-5318]: IGS absolute antenna model igs05_1364.atx, update including GLONASS

[Gerd Gendt]

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IGS Electronic Mail      06 Mar 10:57:36 PST 2006      Message Number 5318
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Author: Gerd Gendt 

Subject: IGS absolute antenna model igs05_1364.atx, update including GLONASS

Dear colleagues,

As already announced (IGSMAIL-5189) the IGS is preparing a switch from
relative to absolute antenna calibrations. For several months
the new model was already used in parallel tests, which will enable the
IGS to set up a consistent new reference frame.

Recently, CODE has computed antenna PCVs and offsets for all GPS and GLONASS
satellites based on a reprocessing for the intervals January and August 2004,
March 2005 and June to December 2005. 

The solution for the GPS satellites is in good agreement with the existing
models, in PCV and offsets. Therefore we are confident that the simultaneously
estimated GLONASS parameters are consistent with the existing model for GPS.

The mean pattern for GLONASS (including GLONASS-M) [mm] is:
  2.7   0.3  -0.1  -0.5  -0.8  -0.8  -0.5  -0.2  -0.3  -0.2  -0.2   0.1
 -0.1  -0.1   0.7

This pattern was fixed in a second step, together with the GPS antenna
patterns and offsets, to generate the antenna offsets for all active
GLONASS satellites (referenced to epoch 2000.0):

   GLONASS Slot Offset [mm]
   701     6    2187.6 +-  16.7 nobs: 193
   711     5    1912.1 +-  21.6 nobs: 242
   712     7    2330.3 +-  19.1 nobs: 162
   783    18    1906.6 +-  11.0 nobs: 322
   787    17    2044.6 +-  15.1 nobs: 275
   788    24    2073.8 +-  15.3 nobs: 251
   789     3    1971.0 +-  16.6 nobs: 256
   791    22    1978.1 +-  11.5 nobs: 317
   792    21    1954.7 +-  13.4 nobs: 284
   793    23    1987.0 +-  10.5 nobs: 321
   794     2    1939.2 +-  13.9 nobs: 228
   795     4    2001.0 +-  15.0 nobs: 228
   796     1    1924.2 +-  13.1 nobs: 219
   797     8    1817.8 +-  20.3 nobs: 197
   798    19    2044.4 +-  25.8 nobs:  25

The inclusion of the GLONASS antenna models completes now the new model.
Additionally, the following calibrations were added to the latest version:
     TRM29659.00     SCIS (RABT, SLOR)
     TRM29659.00     SCIT (not in use within the IGS)
     TRM41249.00     SCIT (not in use within the IGS)

After the official release of the ITRF2005 within a few weeks the IGS will 
define the new IGS05 reference frame and will officially switch to the 
absolute antenna model.

The latest version of the model can be found at:

ftp://igscb.jpl.nasa.gov/igscb/station/general/pcv_proposed/igs05_1364.atx


Best regards

Gerd Gendt

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*                         Gerd Gendt                                         *
*  _/_/_/  _/_/_/_/_/_/   GeoForschungsZentrum                               *
* _/       _/       _/    Department Geodesy and Remote Sensing              *
* _/ _/_/  _/_/    _/     Telegrafenberg A17                                 *
* _/    _/ _/     _/      D-14473 Potsdam ,  GERMANY                         *
*  _/_/_/  _/    _/_/_/   Phone : ++49 331 288 1114   Fax :++49 331 288 1759 *
*                         E-Mail: gendt at gfz-potsdam.de                       *
* IGS GFZ AC         :    AFTP://ftp.gfz-potsdam.de/pub/igsprod              *
*                         http://www.gfz-potsdam.de/igs                      *
* IGS Analysis Coord.:    AFTP://ftp.gfz-potsdam.de/pub/igsacc               *
*                         http://www.gfz-potsdam.de/igsacc                   *
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