Analysis of Visual Detection Performance for 16-Foot Boat and Life Raft Targets.
Interim rept. Jan 78-Feb 80,
ANALYSIS AND TECHNOLOGY INC NORTH STONINGTON CT
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Since September 1978 the USCG RD Center has conducted four visual detection experiments to improve the probability of detection in SAR. These are the first in a series of experiments designed to develop visual detection performance models which will be incorporated into the Coast Guards computer-assisted search planning CASP system and the National Search and Rescue Manual. These were controlled experiments involving 8295-foot cutters, 4144-foot boats, helicopters, and fixed wing aircraft searching for 16-foot boat and life raft targets anchored at predetermined locations within the search area. Through a microwave ranging system, searcher and target positions could be accurately reconstructed to determine the lateral range of targets that were detected, as well as not detected. Thus, probability of detection versus lateral range curves could be developed and, by integrating these curves, sweep width could also be determined. A total of 2,234 detection opportunities was generated. A sophisticated binary multivariate logistic regression computer program was used to develop sweep width estimates for the environmental conditions experienced. Of the 11 visual detection parameters investigated, visibility, wind speed, swell height, cloud cover, search unit type, target type and color, suns elevation, and time on task were determined to have a significant effect on sweep width. A more rapid degradation of sweep width was found for deteriorating environmental conditions than is now predicted by the National Search and Rescue Manual. Author
- Optical Detection and Detectors
- Escape, Rescue and Survival