Accession Number:

ADA046872

Title:

Summary Report, Phase I.

Descriptive Note:

Rept. for Mar-Sep 73,

Corporate Author:

UNDERWATER SYSTEMS INC SILVER SPRING MD

Personal Author(s):

Report Date:

1973-12-27

Pagination or Media Count:

40.0

Abstract:

A computer program is described for calculating the signal to noise ratio at the output of vertically directional acoustic arrays in the ocean. The vertical array consists of one to four elements providing an omni-directional and four different types of null patterns. Provision is made for considering other patterns which may be found to be desirable. Multipath transmission is considered in computing signal level. The signal along each path is convolved with the array response for the arrival angle, and the multiple arrivals summed incoherently at the array output. The vertical directionality of the noise is considered and convolved with the array pattern to obtain the noise output. The noise can be partitioned into coherent and incoherent components. Provision is made to investigate the effect of array tilt. The purpose of the study is to compare the SN ratios for various environmental conditions to determine the optimum pattern from among the available choices this portion of the study has not yet been undertaken.

Subject Categories:

  • Acoustic Detection and Detectors
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE