DEVELOPMENT OF A CONVENTIONAL ACOUSTIC BEAMFORMER - CONTRACTOR REPORT AND USER'S GUIDES FOR THE BEAMFORMER AND BEAM PATTERN PROGRAMS

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Authors
  1. Guptill, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Wallace Scientific Software, Halifax NS (CAN)
Abstract
In the processing of sonar signals, the signal to noise ratio can be enhanced through the use of beamforming. Beamforming requires time-series data from a number of acoustic sensors whose relative locations are known. The purpose of conventional beamforming is to filter the data in such a manner that signals from the direction of interest pass unaltered, while noise arriving from other directions in reduced. This is effected by Fourier transforming the multi-channel time-series data to the frequency domain, applying a weight and phase-shift to each channel, summing over all channels, and inverse Fourier transforming the results to the time domain. This document describes a software beamformer and its accompanying beampattern generator. Features of the software beamformer include compatibility with DREA's hardware beamformer, the ICS SBF-256, and the ability to process up to 64 channels of input and/or output. The input time series can be either real or complex. The beamformer will compensate for relative differences in sensor sensitivities, a capability that the hardware beamformer does not have. For maximum portability, the software is implemented in the C programming language. TRUNCATED
Report Number
DREA-CR-95-419 — Contractor Report
Date of publication
01 Mar 1995
Number of Pages
46
DSTKIM No
97-02173
CANDIS No
502410
Format(s):
Hardcopy;Document Image stored on Optical Disk

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