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XMM-Newton Science Analysis System Page: 1
siamgen
July 2, 2008
Abstract
siamgen generates the Star Tracker / Instrument Alignment Matrices (SIAMs)
for the instruments EMOS1, EMOS2, EPN, RGS1, RGS2, and OM as specied in
the Interface Control Document[2]
1 Instruments/Modes
Instrument Mode
all except ERM all
2 Use
pipeline processing no
interactive analysis no
CCF maintenance yes
3 Description
siamgen generates the SIAM matrices as specied in the Interface Control Document[2] for the six instru-
ments EMOS1, EMOS2, EPN, RGS1, RGS2, OM from the contents of the CCF Boresight constituent.
For each instrument the cal is inquired for the corresponding matrix on which siamgen performs a basic
ICD-compliance check (see Sect. 5). If that checks succeeds the matrix elements are written to stdout
preceded by a header record containing the instrument ID and time when the boresight calibration for
this instrument was performed.
In order to provide the SIAM matrices to FDS according to the Interface Control Document[2] the output
of siamgen should be redirected into a le and wrapped into a suitable XFTS wrapper[1].
siamgen has no mandatory parameters. For the list of optional parameters see Sect. 4.
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4 Parameters
This section documents the parameters recognized by this task (if any).
Parameter Mand Type Default Constraints
comment no string \SOC generated SIAM
matrix"
length <= 35
comment string to go into the SIAM header record (see ICD form details)
withcaltimexxx no boolean false true|false
possible values of xxx are: emos1, emos2, epn, rgs1, rgs2, om; boolean switch to determine whether the
value given in parameter caltimexxx is applicable or not.
caltimexxx no string \" format:
yyyy-mm-dd[Thh:mm:ss]
possible values of xxx are: emos1, emos2, epn, rgs1, rgs2, om; the time to put in the rst line of the
corresponding SIAM block as time of the boresight calibration of the instrument; if withcaltimexxx is
set to false the current time will be used;
5 Errors
This section documents warnings and errors generated by this task (if any). Note that warnings and
errors can also be generated in the SAS infrastructure libraries, in which case they would not be docu-
mented here. Refer to the index of all errors and warnings available in the HTML version of the SAS
documentation.
WrongSIAMMatrix (error)
A SIAM matrix retrieved from the CAL is not compliant with the requirements of the SIAM
Interface Control Document[2].
6 Input Files
none
7 Output Files
none - SIAM matrices are printed on stdout; redirect to le if necessary
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8 Algorithm
subroutine siamgen
write SIAM header record
for instrument in (list of instruments)
get boresight matrix for instrument
validity check of matrix
write SIAM matrix for
endfor
end subroutine siamgen
9 Comments
 The XFTS wrapper needed to send the SIAM le to FDS is not generated by siamgen.
10 Future developments
None anticipated.
References
[1] ESA. XMM interface control document top level le transfer system (FTS). Technical Report XMM-
SOC-ICD-0007-DPD Issue A5, ESA/DPD, Sept 1997.
[2] R. Mugellesi et al. Star Tracker / Instrument Alignment Calibration - Interface Control Document.
Technical Report XMM-MOC-ICD-0025-OAD Issue 1.2, ESA/TOS/GFO, November 1999. Found at
the URL: ftp://astro.estec.esa.nl/pub/XMM/documents/siam icd.pdf.
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