Accession Number:

ADA109419

Title:

Spatial-Gain Improvement Resulting from Left/Right Discriminating Elements of an Underwater Towed Array

Descriptive Note:

Memorandum rept.

Corporate Author:

SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)

Personal Author(s):

Report Date:

1981-09-15

Pagination or Media Count:

50.0

Abstract:

The improvement in spatial gain of an underwater towed array as a result of leftright discriminating elements is investigated. This is accomplished by simulating the measurement of beam noise in a dynamic shipping distribution for a major ocean basin. Beam-noise measurements by a leftright discriminating array at six locations of various shipping densities are compared with the corresponding measurements by a conventional towed away. Cumulative distribution functions of the beam noise as a function of beamwidth are used as a basis for comparison. The results indicate that the additional spatial gain is non-linear with percentage of observations. It varies from about 2 dB for 80 to about 9 to 12 dB for 10 at some sites. At other sites it is considerably less and in some cases vanishes at the low percentages.

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE