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Proceedings Paper

Maximum Likelihood Approach To Gamma Circumvention
Author(s): P. C. Trepagnier
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Paper Abstract

A critical element in the Time Dependent Processing chain for scanning infrared sensors is electronic gamma circumvention. The most successful approach to gamma circumvention to date is a two stage algorithm, Spike Adaptive Time Delay and Integration (SATDI). This heuristic approach makes no assumptions about gamma-induced noise except that it is an additive corruption of the true signal. If, however, one can model the form of the gamma-induced noise distribution, it is possible to design a maximum likelihood estimation model which explicitly utilizes the parametric form of the noise. Such a model will, in general, be more efficient than a heuristic one, since it contains more information about the noise process. The parametric form studied in this paper is an exponential distribution, λe-λr, where r is the received signal. This distribution is a reasonable approximation to the observed gamma spectrum in infrared detectors. A maximum likelihood estimation equation corresponding to this noise distribution is derived, and its performance is compared to SATDI. It is found that, for a bright gamma background, either much better detection for a fixed false alarm rate, or many fewer false alarms for a fixed detection probability, may be achieved using the maximum likelihood estimator as compared to SATDI.

Paper Details

Date Published: 5 September 1989
PDF: 8 pages
Proc. SPIE 1096, Signal and Data Processing of Small Targets 1989, (5 September 1989); doi: 10.1117/12.960346
Show Author Affiliations
P. C. Trepagnier, MIT Lincoln Laboratory (United States)

Published in SPIE Proceedings Vol. 1096:
Signal and Data Processing of Small Targets 1989
Oliver E. Drummond, Editor(s)

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