Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties

Weiss, Stephan and Hadley, Mark and Wilcox, Jon (2017) Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties. In: IEEE Sensor Signal Processing in Defence Conference, 2017-12-06 - 2017-12-07, London. (https://doi.org/10.1109/SSPD.2017.8233239)

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Abstract

Aperture and operating frequency of a beamformer are generally proportional to its resolution, and inversely proportional to its beamwidth. This paper addresses the design and implementation of a beamformer with a frequency-dependent limitation of its aperture such that the frequency-dependence of its resolution is eliminated. Operating across a number of octaves, firstly an octave-invariance design is achieved by means of a nested array structure. Secondly, within each octave, a frequency-dependent aperture control then removes the remaining frequency-dependency. By exploiting Fourier properties and correspondences between coefficient and beamspace, we show that this design is exact, and can accommodate the inclusion of arbitrary shading and different look directions.

ORCID iDs

Weiss, Stephan ORCID logoORCID: https://orcid.org/0000-0002-3486-7206, Hadley, Mark and Wilcox, Jon;
CORE (COnnecting REpositories)