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dorismail               30-Oct-2018 09:16:48 Message No 1142
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Author: Couhert Alexandre <Alexandre.Couhert@cnes.fr>
Subject: Jason-3 / CNES POE-F orbit standards




Dear colleagues,

The first Jason-3 precise orbits (cycles 95 and 96) in the new POE-F standards
(previously GDR-E or POE-E standards) were delivered today to the CDDIS/IGN
data servers. They are flagged with the version number VV=20 in the file name:

/pub/doris/products/orbits/ssa/ja3/ssaja320.b18249.e18259.DG_.sp3.001.Z
/pub/doris/products/orbits/ssa/ja3/ssaja320.b18259.e18269.DG_.sp3.001.Z

(reminder of filename convention:
ssa<sss>VV.bXXDDD.eYYEEE.dgs.sp3.LLL.Z

where :
      ssa fixed part (=ssa pour SSALTO)
      sss = satellite three-character abbreviation : ja3
      VV  = version number of the solution (=3D20 for POE-F)
      b   = fixed part ("begin")
      XX  = last two digits of year of first position
      DDD = three-digit day of year of first position (2)
      e   = fixed part ("end")
      YY  = last two digits of year of last position
      EEE = three-digit day of year of last position (2)
      dgs = types of data used for the orbit determination
                d= "D" or "_" : if DORIS data are used or not
                g= "G" or "_" : if GPS data are used or not
                s= "S" or "_" : if SLR data are used or not
      sp3 = fixed part, referring to the SP3 format
      LLL = version number of the file

The previous Jason-3 precise orbits (cycles < 95) have been reprocessed and
will be flagged with the same version number, when delivered to the CDDIS/IGN
data servers. The old POE-E/GDR-E orbits (flagged with the version number 10)
will then be moved to a new separate directory. The readme file included in the 
satellite directory will be updated accordingly.

Sentinel-3A POE orbits will switch to the POE-F standards from the beginning
of cycle 38 (end of the tandem period and during the drift phase). Sentinel-3B
POE orbits will be produced in POE-F standards from the same date.

Saral POE orbits will switch to the POE-F standards by the end of the year.

Jason-2 and CryoSat-2 POE-F orbits will switch to the POE-F standards in 2019.

HY-2A POE orbits will switch to the POE-F standards at a later stage, without
being reprocessed.

The reprocessing of the TOPEX/Poseidon POE orbits is currently being finalized
and should be available by the end of this year.

The reprocessing of the Jason-1 and Envisat POE orbits is not planned so far.

Spot satellite orbits will not be reprocessed.

A summary of the changes between the previous GDR-E/POE-E and the new
POE-F POD standards can be found on the IDS web site on the page:
ftp://ftp.ids-doris.org/pub/ids/data/POD_configuration_POEF.pdf

Best regards,
CNES POD Team

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Alexandre Couhert
Orbit Determination Department - Flight Dynamics Division
CNES - Centre Spatial de Toulouse
18 Av. Edouard Belin, 31401 Toulouse cedex 9, FRANCE
Tel.: +33 5 61 28 20 56 | Fax: +33 5 61 28 18 55
alexandre.couhert@cnes.fr<mailto:alexandre.couhert@cnes.fr> | http://www.cn=
es.fr<http://www.cnes.fr/>
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