ADAPTIVE BEAMFORMING AGAINST REVERBERATION FOR A THREE-SENSOR ARRAY

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Authors
  1. Maksym, J.N.
  2. Sandys-Wunsch, M.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Two algorithms for beamforming an dbearing estimation of echoes from an active sonar transmisison in a strongly reverberant bistatic environment are described. The receiving array consists of a single omnidirectional sensor and two collocated orthogonal dipole sensors, and is deployed in a bistatic configuration. Both beamforming algorithms are based on minimum-variance techniques. The first algorithm matches the pattern of the minimum-variance beamformed data with that expected from an impulse at a known bearing. The second algorithm reforms the sensor data from the minimum-variance beam response. Fixed-coefficient limacon beamforming is then applied to estimate the beam power map with reduced reverberation. The detection performance of both techniques is evaluated by injection of a synthetic target echo into experimental reverberation data. The results suggest an enhanced array gain against reverberation of the order of 3 dB for reasonable values of signal strength and probability of false alarm, compared to a direct application of fixed-coefficient limacon beamforming. The root-mean-squared bearing error for both techniques is reduced significantly, when compared to the limacon beamformer, by factors varying from 2 to 5.
Date of publication
22 Aug 1997
Number of Pages
6
Reprinted from
J Acoust. Soc. Am., vol 102, no 6, 1997, p 3433-3438
DSTKIM No
98-00569
CANDIS No
507273
Format(s):
Hardcopy;Document Image stored on Optical Disk

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