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.
|Number of pages||5|
|Publication status||Accepted/In press - 6 Sep 2017|
|Event||IEEE Sensor Signal Processing in Defence Conference - London, London, United Kingdom|
Duration: 6 Dec 2017 → 7 Dec 2017
|Conference||IEEE Sensor Signal Processing in Defence Conference|
|Period||6/12/17 → 7/12/17|
- broadband sensor applications
- broadband beamformers
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.