Accession Number:

ADA172911

Title:

Effects of Acoustic Multipath Interactions on Source Range and Bearing Estimation for a Focused Line Array

Descriptive Note:

Technical document

Corporate Author:

NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT

Personal Author(s):

• Monti, Joseph M.
• Koenigs, Paul D.

Report Date:

1985-05-24

Pagination or Media Count:

20.0

Abstract:

A computer simulation technique was developed to investigate the effects of acoustic multipath interactions on source range and bearing estimation for a focused line array. To simulate the multipath environment, the Generic Sonar Model Weinberg, NUSC TD 5971, 19 December 1981 was used to modify source signals and emulate oceanic transmissions to individual sensors. Characteristics of a narrowband frequency domain focused beamformer were implemented incorporating wavefront curvature techniques and a maximum- likelihood estimator. Simulations for sparsely populated colinear arrays were conducted at several frequencies for differing sound speed profiles, bottom loss conditions, and sourcereceiver configurations. The beamformer output was used to obtain relative array pressure response and analyzed to obtain source range and bearing estimation errors. For a given environmental case the results indicate no bearing and relatively small range errors for a source located at broadside for the simulated range and frequency parameters.

Descriptors:

• *ACOUSTIC ARRAYS
• *ARMY RESEARCH
• *BEAM FORMING
• *DIRECTION FINDING
• *MANAGEMENT PLANNING AND CONTROL
• *MULTIPATH TRANSMISSION
• *RANGE FINDING
• *SONAR ARRAYS
• ERRORS
• FOCUSING
• LINEAR SYSTEMS
• OPERATIONAL EFFECTIVENESS

Subject Categories:

• Administration and Management

Distribution Statement:

APPROVED FOR PUBLIC RELEASE