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Proceedings Paper

Self-Adjusting Flight Electronics (SAFE)
Author(s): Thomas P. Caudell; I. David Levy
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Paper Abstract

Expert system techniques have been applied to a parameter adjustment problem of practical importance. Charge-coupled device (CCD) technology is being pushed to the limits in new flight electronics systems. These complex, solid-state devices require continuous adjustment and monitoring to maintain near optimal performance. Although human experts can make the sensitive adjustments needed, to have them do so is neither feasible nor cost effective. Each CCD array has nearly 30 analog inputs that control its behavior. A simple expert system has been written that performs the adjustments to bring the CCD to near optimal performance with respect to three CCD parameters: (1) bucket capacity, (2) charge transfer efficiency, and (3) noise. The system is written in FORTRAN and runs on an IBM XT, interfaced with an HP1000 computer. The second machine actually controls the analog hardware, which, in turn, interfaces with the CCD. The knowledge of device physics has been captured in the form of facts. The heuristic knowledge of adjustment order and magnitude has been represented in the form of rules. Weekly meetings over a 3-month period between the experts and the knowledge engineer supplied the necessary knowledge. The current system improves the CCD array to a higher level than that achievable by the human expert, and in considerably less time.

Paper Details

Date Published: 6 November 1986
PDF: 6 pages
Proc. SPIE 0686, Infrared Detectors, Sensors, and Focal Plane Arrays, (6 November 1986); doi: 10.1117/12.936537
Show Author Affiliations
Thomas P. Caudell, Hughes Aircraft Company (United States)
I. David Levy, Hughes Aircraft Company (United States)


Published in SPIE Proceedings Vol. 0686:
Infrared Detectors, Sensors, and Focal Plane Arrays
Hideyoshi Nakamura, Editor(s)

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