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Coherence effects on the detection performance of quadratic array processors, with applications to large-array matched-field beamforming

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2 Author(s)
Morgan, D.R. ; AT&T Bell Lab., Whippany, NJ, USA ; Smith, T.M.

The effect of coherence is examined using an exponential-power-law model for the signal wavefront correlation. Detection performance is quantified by the small-signal deflection criterion, which is first reviewed in the general setting of quadratic detectors and then applied to matched-field and optimal quadratic beamformers. It is shown that the detection performance of matched-field beamforming is substantially degraded for large arrays and typical coherence lengths. The optimal quadratic processor reduces this coherence loss, but at a cost of greatly increased processor complexity. Several suboptimal beamformers with reduced computational load are also developed, and their detection performance is compared to that of the matched-field and optimal beamformers. One suboptimal processor, the subarray beamformer, has proved outstanding for this application in three respects: it can realize within 1 dB of optimal performance; it is robust over a class of correlation functions; and it entails a computational burden no greater than that of full-array matched-field beamforming

Published in:

Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on

Date of Conference:

23-26 May 1989