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Proceedings Paper

Simple star removal for scanning passive sensors
Author(s): T. J. Janssens; D. C. Pridmore-Brown
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Paper Abstract

The most familiar method of star removal for a scanning space surveillance sensor uses a permanent Sky Catalog Comparison in which the location in inertial coordinates of each object above threshold TH is checked against the catalog. If that location has a catalog star, the object is removed. The catalog limit is at a lower threshold, TL, than the threshold of stars to be removed, TH. The primary method proposed here, method A, "Prior Scan Comparison," is similar to the Sky Catalog Comparison, except that the comparison catalog is simply the prior scan at threshold TL. (That small portion of the current scan not viewed on the prior scan uses the following scan for comparison.) The resulting simplicity is significant, inasmuch as just two scans are involved, large amounts of storage and retrieval are avoided, and no catalog updates are required. Since asteroids do not move appreciably in inertial coordinates from scan to scan, asteroids that would leak through the Sky Catalog Comparison method are removed by this method. There are three constraints on the high and low thresholds used by the Prior Scan Comparison method to ensure an acceptable star leakage rate, target detection rate, and target loss rate due to star search boxes. Under extreme conditions, it may not be possible to satisfy constraints simply by adjusting the two threshold values, particularly when the noise has an abnormal, heavy tailed (platykurtic) distribution. Under such conditions, modifications of this algorithm may be necessary. Two such modified algorithms are described as methods B and C. Both are still much simpler than the permanent Star Catalog method.

Paper Details

Date Published: 7 December 1988
PDF: 8 pages
Proc. SPIE 0972, Infrared Technology XIV, (7 December 1988); doi: 10.1117/12.948326
Show Author Affiliations
T. J. Janssens, The Aerospace Corporation (United States)
D. C. Pridmore-Brown, The Aerospace Corporation (United States)

Published in SPIE Proceedings Vol. 0972:
Infrared Technology XIV
Irving J. Spiro, Editor(s)

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