Accession Number : ADA294453

Title :   Evaluation of the Sensitivity and Limits of the Passive Acoustic Ranging Algorithm for Single and Multiple Helicopters.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB

Personal Author(s) : Carnes, Benny L. ; Morgan, John C.

PDF Url : ADA294453

Report Date : MAR 1995

Pagination or Media Count : 58

Abstract : Passive acoustic ranging (PAR), based on acoustic Doppler shifts, has been proposed as a suitable method for extracting velocity and range information from a source which emits a time-dependent acoustic signal. Operational constraints on the PAR method were evaluated and estimates were made of the limitations of realistic operation under various environmental conditions. In addition, performance of the PAR method was evaluated for multiple helicopters. Several methods of analysis of signals were tested to determine the optimum method for field implementation. It was found that additional information gained from preprocesssing with an artificial neural network would enable the analysis to process a signal from multiple moving sources and enhance the response time of the system. (AN)

Descriptors :   *ACOUSTIC DETECTION, *PASSIVE SYSTEMS, *HELICOPTERS, *SOUND RANGING, ALGORITHMS, SIGNAL PROCESSING, EXPERIMENTAL DATA, NEURAL NETS, OPTIMIZATION, TIME DEPENDENCE, ACOUSTIC WAVES, COMPARISON, MOTION, ACCURACY, SENSITIVITY, ESTIMATES, FEASIBILITY STUDIES, WAVE PROPAGATION, LIMITATIONS, ACOUSTIC SIGNALS, ARTIFICIAL INTELLIGENCE, RANGE FINDING, ACOUSTIC VELOCITY, ACOUSTIC DATA, DOPPLER EFFECT.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE