Implementation of a Flexible Frequency-Invariant Broadband Beamformer Based on Fourier Properties

Stephan Weiss, Mark Hadley, Jon Wilcox
2017 2017 Sensor Signal Processing for Defence Conference (SSPD)  
2017) Implementation of a flexible frequency-invariant broadband beamformer based on fourier 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
more » ... 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.
doi:10.1109/sspd.2017.8233239 fatcat:bi4j3ugwtrggvejau6czrnngty