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

Stephan Weiss, Mark Hadley, Jon Wilcox

Research output: Contribution to conferencePaper

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.

Conference

ConferenceIEEE Sensor Signal Processing in Defence Conference
Abbreviated titleSSPD'17
CountryUnited Kingdom
CityLondon
Period6/12/177/12/17
Internet address

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Invariance

Keywords

  • broadband sensor applications
  • broadband beamformers
  • beamwidth

Cite this

Weiss, S., Hadley, M., & Wilcox, J. (Accepted/In press). Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties. Paper presented at IEEE Sensor Signal Processing in Defence Conference, London, United Kingdom.
Weiss, Stephan ; Hadley, Mark ; Wilcox, Jon. / Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties. Paper presented at IEEE Sensor Signal Processing in Defence Conference, London, United Kingdom.5 p.
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note = "IEEE Sensor Signal Processing in Defence Conference, SSPD'17 ; Conference date: 06-12-2017 Through 07-12-2017",
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Weiss, S, Hadley, M & Wilcox, J 2017, 'Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties' Paper presented at IEEE Sensor Signal Processing in Defence Conference, London, United Kingdom, 6/12/17 - 7/12/17, .

Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties. / Weiss, Stephan; Hadley, Mark; Wilcox, Jon.

2017. Paper presented at IEEE Sensor Signal Processing in Defence Conference, London, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties

AU - Weiss, Stephan

AU - Hadley, Mark

AU - Wilcox, Jon

PY - 2017/9/6

Y1 - 2017/9/6

N2 - 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.

AB - 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.

KW - broadband sensor applications

KW - broadband beamformers

KW - beamwidth

UR - http://sspd.eng.ed.ac.uk/

M3 - Paper

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Weiss S, Hadley M, Wilcox J. Implementation of a flexible frequency-invariant broadband beamformer based on fourier properties. 2017. Paper presented at IEEE Sensor Signal Processing in Defence Conference, London, United Kingdom.