4.4 SAX telemetry files on disk
As result of FOT filing the currently defined
fotdir
will contain the requested subset of the following files, where
typ is the
file type
File naming convention
saxfot.typ
- for any common file independent of the instrument (like
tapedir,
ephemeris,
attitude,
etc.) e.g.
saxfot.tapedir
ee.typ
- for any instrument file independent of the observation (like the
instdir
e.g. for instrument ee=w1 one has
w1.instdir
oeennn.typ
- for any instrument file for observing period type o (=i|n|f
for initial slew,
normal pointing or final slew), instrument ee and
observation
nnn,
e.g. for
observation 7 of normal pointing for MECS one may have
nme007.meexconf
nme007.m3dir002
etc.
File hierarchy and naming example
We report here the above naming scheme along with the
FOT layout hierarchy
for an example of a single instrument.
File content and layout
The detailed layout of all files is contained in documentation produced by Telespazio
and available at the
SAX-SDC.
We give here basic information on the main file types.
- tape directory
An ASCII file with one header record with target and observer name, observation date
and other ancillary information, plus one record for each tape file, describing the
blocking parameters (record length, number of records etc.) etc.
- ephemeris file
An ASCII file with the orbital position and velocity at 1 sec resolution
- attitude file
An ASCII file with the reconstructed attitude at 0.5 sec resolution
- OBT UTC correlation file
An ASCII file with sporadic information for the correlation between On Board Time
and Universal Time
- spacecraft HK
These files are raw binary telemetry and are not normally present nor used by
the general observer
- instrument directory
An ASCII file which contains one record per observation, with the start and end time,
the target name and a reference pointing
- observation directory
An ASCII file listing the number of records and record length for each of the
following data files present in the respective
observation
- experiment configuration file
A self-explanatory ASCII file listing the setup of all commandable parameters of
an instrument during the respective observation
- instrument HK
One binary telemetry file containing periodic readouts (with instrument dependent
periodicities, e.g. 64, 32, 16 and 2 s) of
parameters
like voltages, temperatures,
safety ratemeters etc.
This file is normally always present.
- engineering files
Binary telemetry files (in some cases more than one, e.g. by instrument sub-unit)
containing periodic readouts (usually at 1 sec periodicity) of scientifically relevant
information (like ratemeters).
These files are normally present only when instrument data processing is enabled.
- science files
Binary telemetry files containing the scientific telemetry. More files may be present
according to the number of instrument sub-units and on the operating modes. May be at
variable rate (DIRect mode event data) or fixed rate (INDirect modes).
These files are normally present only when instrument data processing is enabled.
sax.iasf-milano.inaf.it/Xashelp/fotfile.4.html
:: original creation 2002 Sep 04 17:42:20 CEST ::
last edit 2002 Sep 04 17:42:20 CEST