Interpolation Beamforming for a Bent Array

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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 computationally efficient interpolation beamformer is investigated. For each snapshot, each beam's output is formed from the weighted sum of relatively few Fourier coefficients taken from the Fast-Fourier transform of the narrowband sensor data. The weights perform an interpolation action on the Fourier coefficients and can be chosen to offer both array shading and bend compensation. A simple rule-of-thumb is given for the minimum number of weights necessary for Kaiser-Bessel shading of a uniform line-array bent into an arc of a circle of known radius. It is demonstrated, via numerical simulations, that such an interpolation beamformer has a beampattern which is within wbout 0.1 dB of that of the benchmark delay-and-sum beamformer over the important mainlobe and near-in sidelobes. It is also shown that the interpolation beamformer can be used in a wideband active sonar scenario involving linear FM chirps and correlation detection.
Keywords
Interpolation;Curvature
Report Number
DREA-CR-1999-072 — Contractor Report
Date of publication
01 Sep 1999
Number of Pages
67
DSTKIM No
CA000094
CANDIS No
512291
Format(s):
Hardcopy;Document Image stored on Optical Disk

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