ROBUST ADAPTIVE BEAMFORMING

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Authors
  1. Swingler, D.N.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Saint Mary's Univ, Halifax NS (CAN)
Abstract
The performance of a narrowband, quadratically-constrained, minimum-variance, distortionless-response (QC-MVDR) adaptive beamformer is examined through numerical simulations. The quadratic-constraint refers to limiting the sum of the squares of the sensor weights. Infinite-time and the finite-time behaviour are discussed in various scenarios which are known to cause performance degradation for the standard (non-quadratically-constrained) minimum-variance beamformer. The transient behaviour of the method in highly dynamic fields is also briefly examined. It is demonstrated that in terms of output signal-to-noise ratio, the QC-MVDR does indeed offer useful performance gains though this does not appear to be true if the issue is simple one of signal detection. The QC-MVDR approach is both simple to understand and to implement and is extensible to broadband scenarios. However, unlike the standard MVDR method, there does not appear to be any obvious means to create a fast (i.e. recursive) version and hence the method carries something of a computational load penalty.
Keywords
Adaptive beamforming;Superdirective processing;Computational loads
Report Number
DREA-CR-96-450 — Contractor Report
Date of publication
01 Jun 1996
Number of Pages
70
DSTKIM No
97-00617
CANDIS No
500708
Format(s):
Hardcopy;Document Image stored on Optical Disk

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