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ROSETTA SCLK Files
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Last update: 27 JUL 2005
This "aareadme.txt" file describes the contents of the KERNELS/SCLK
directory of the ROSETTA SPICE data server. It also provides the file
naming conventions used for the ROSETTA SCLK kernels, and it provides
identification of the most current version of SCLK files.
SCLK files are created from the information contained in the ESOC's DDID
Time Correlation Packets.
All SCLK files (*.TSC) contained in this directory are unix text files.
These may be used in a non-compatible text environment by using
the ASCII mode of FTP to port the files. [Ref 4b]
Contact Jorge Diaz del Rio (jdiaz@rssd.esa.int) or Joe Zender
(Joe.Zender@esa.int) if you have any questions.
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References
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1. Data Delivery Interface Document (DDID) Issue B5 (MEX-ESC-IF-5003)
27 Mar 2003
2. SCLK Required Reading. NAIF Document No. 222.02 06 Oct 1999
3. Auxiliary Data Conversion into SPICE Kernels and Distribution.
(MEX-EST-PL-10210)
4. Selected SPICE Tutorials from the NAIF server:
ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/office/individual_docs/
a) SCLK Tutorial 13_lsk_and_sclk.ppt
b) Porting Kernels Tutorial 09_porting_kernels.ppt
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Rosetta SCLK Directory Structure
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aareadme.txt Text file describing the directory structure, the naming
conventions for the SCLKs, and the current version(s) of
each SCLK type.
former_versions Subdirectory that contains obsolete versions of the
SCLK files that have been updated in the Current SCLK
Kernels Set, and fake SCLK files used before the creation
of real ones.
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Rosetta Spacecraft SCLK Naming Covention ROS_yymmdd_[spec].TSC
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token description
------------ --------------------------------------------------
yymmdd File release date.
[spec] Data type specification Identifier:
STEP -- real SCLK files
FAKE -- special fake SCLK files
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Current SCLK Kernels Set
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Name Comments
------------------- -----------------------------------------------------
ROS_yymmdd_STEP.TSC This file is a SPICE spacecraft clock (SCLK) kernel
containing information required for Rosetta spacecraft
on-board clock to UTC conversion. This file provides
the same time information that the Time Correlation
packets released via DDS, with the exception of 60
seconds before the starting time of each packet,
during which the clock rate was sightly adjusted to
make the correlation function continuous. For further
discussion in this topic see [Ref 3]. This file was
released on yy-mm-dd.
ROS_TRIV.TSC Clock used by the Rosetta SGS to create Rosetta attitude
kernels for study purposes.