IRAS Explanatory Supplement
V. Data Reduction
D. Point Source Confirmation
D.2 Overview of Seconds-Confirmation
D.2.a Band Seconds-Confirmation
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In-band seconds-confirmation was done in the position domain
rather than the time domain to account for variations in the scan
rate. The design of the focal plane permitted legitimate sources
to produce pairs or triplets of detections and these modes were
handled separately. When neither mode appeared correct, confusion
processing was required. Although this salvaged useful detections,
it could also let false alarms leak through. The confirmation
process, however, may be considered a serial filter
arrangement, and so a few false alarms slipping through one stage
are very unlikely to penetrate the entire obstacle course.
After accepting a confirmed point source, the flux and position
estimates were refined. The multiple observations were used in
statistical computations aimed at gathering information about
the instrument and the a priori statistics.
Chapter Contents |
Introduction |
Authors |
References
Table of Contents |
Index |
Previous Section |
Next Section