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XMM-Newton Science Analysis System Page: 1
omdrifthist
November 22, 2004
Abstract
Produces PPS products OM postscript tracking history product
1 Instruments/Modes
Instrument Mode
OM FAST
OM IMAGING
2 Use
pipeline processing yes
interactive analysis yes
3 Description
This task provides graphical and statistical information on the OM tracking history. This information
will enable the observer to assess the eects of the DPU `shift and add' procedure on the OM PSF. The
input le is the pipeline(omprep)-prepared OM tracking history auxiliary le from a single exposure,
which contains an (x; y) pointing position (as measured from the tracking stars) for each tracking frame.
The resulting plot, which is PPS product OM postscript tracking history plot, contains statistics on
the tracking history, a spot diagrams of the incremental drift-size, and two histograms showing the
distribution of spacecraft pointing in x and y.
4 Parameters
This section documents the parameters recognized by this task (if any).
Parameter Mand Type Default Constraints
set yes string none
Name of pipeline-prepared OM tracking history data auxiliary le for the exposure
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plotle no string pgplot.ps
name of output postscript le (PPS product OM postscript tracking history plot)
trackradius no real 2.5
nominal radius of pointing accuracy
hardcopy no boolean T
produce a hardcopy?
pages no integer 1 2 1 <= pages <= 2
List of pages to plot
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.
badFileMode (fatal)
The data mode for the le is not set to TRACKING
ZERODRIFT (warning)
Tracking data is absent for this exposure so no tracking diagrams or statistical information
can be generated
corrective action: No tracking statistics or plots will be generated
No good tracking-history frames found- (warning)
Tracking le exists but there are no tracking frames found within it so no statistics or
tracking plots can be generated.
corrective action: No statistics or tracking diagrams will be produced.
Failed to release memory (warning)
corrective action: Memory for quoted variable can not be released for some reason
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6 Input Files
1. Pipeline-prepared (OMPREP) OM Tracking History Auxiliary File
7 Output Files
1. PPS product OM postscript tracking history plot
8 Algorithm
subroutine omdrifthist
open th_file
read x,y pairs
compute incremental tracking drift array
compute mean x,y
compute sigma x,y
compute number of times modulus(x,y) exceeds track_radius
open postscript file
append exposure details
plot incremental drift size histogram
append tracking history stats (e.g means and sigmas)
close postscript file
end
end subroutine omdrifthist
9 Comments
 None.
10 Future developments
 In interactive use (hardcopy=no), task needs to prompt for page advance.
References
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