Accession Number : ADA300502

Title :   Adaptive Acoustic Signal Detection.

Descriptive Note : Final rept. 1 Sep 86-30 Jun 90,

Corporate Author : DUKE UNIV DURHAM NC

Personal Author(s) : Nolte, L. W.

PDF Url : ADA300502

Report Date : 30 JUN 1990

Pagination or Media Count : 34

Abstract : In this research, optimum ocean-model-based detection algorithms were developed for signals received through an inhomogeneous acoustic ocean medium. These optimal algorithms are driven by the knowledge of the underlying wavefront propagation in an inhomogeneous ocean medium. Comparison of narrowband and broadband performance as a function of range for both range- independent and range-dependent ocean environments were made. In addition, sensitivity of detection performance to mismatch in the sound speed profile as a function of range and transmitted were obtained. A new a posteriori probability source localization algorithm was developed which exhibits much less sensitivity to the underlying assumptions of the ocean acoustic medium (sound speed profiles) than do the classical matched field algorithms. The design and performance of optimal and fault-tolerant distributed detection networks, from a signal detection theory point of view, were also developed. (AN)

Descriptors :   *ACOUSTIC DETECTION, *UNDERWATER ACOUSTICS, *ACOUSTIC VELOCITY, ALGORITHMS, SIGNAL PROCESSING, COMPUTERIZED SIMULATION, OPTIMIZATION, TRANSFER FUNCTIONS, DISTRIBUTED DATA PROCESSING, MAXIMUM LIKELIHOOD ESTIMATION, COMPARISON, PROBABILITY, SIGNAL TO NOISE RATIO, PASSIVE SYSTEMS, SENSITIVITY, PROFILES, WAVE PROPAGATION, BROADBAND, SOUND TRANSMISSION, ADAPTIVE SYSTEMS, ACOUSTIC SIGNALS, RANGE(DISTANCE), RAY TRACING, OCEAN MODELS, OCEAN ENVIRONMENTS, GULF STREAM, WAVEFRONTS, NARROWBAND, OCEAN SURVEILLANCE, FAULT TOLERANT COMPUTING, SOUND RANGING.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE