Accession Number : ADA194665

Title :   Probabilities of Detection and Recognition of Flashing Lights on Rolling Buoys.

Descriptive Note : Interim rept.,

Corporate Author : COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT

Personal Author(s) : Brown, Daniel M

PDF Url : ADA194665

Report Date : Aug 1987

Pagination or Media Count : 102

Abstract : This report shows how buoy motion affects a mariner's ability to detect and recognize standard Coast Guard buoy lights. Buoy roll reduces the effective intensity of the light in the mariner's direction, which results in a detection distance much shorter than the currently used nominal range. Data for this analysis were provided by recording motion of two buoys with a specially designed optical device. The data were analyzed to predict variation of light intensity in a mariner's direction over time and, furthermore, to predict probabilities of detecting and recognizing the flash characteristics of the light. Results show increased detection range with increased vertical divergence, reduced detection range when buoy roll period and flash period are similar, and detection distances as short as 30% of published nominal range. Keywords: Buoy motion, Probability of detection, Probability of recognition, Response amplitude operator, Buoy lights, Aids to navigation.

Descriptors :   *BUOYS, *MOTION, *NAVIGATIONAL AIDS, *VISUAL PERCEPTION, *VISIBILITY, AMPLITUDE, DETECTION, FLASHES, INTENSITY, LIGHT, MARKER LIGHTS, OPTICAL EQUIPMENT, PROBABILITY, RANGE(DISTANCE), RECOGNITION, RECORDING SYSTEMS, REDUCTION, ROLL, VARIATIONS, FOURIER TRANSFORMATION, POWER SPECTRA, COMPUTER PROGRAMS

Subject Categories : Underwater and Marine Navigation and Guidance
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE