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Off-broadside main beam design and subband implementation for a class of frequency invariant beamformers

Liu, W. and Weiss, S. (2009) Off-broadside main beam design and subband implementation for a class of frequency invariant beamformers. Signal Processing, 89 (5). pp. 913-920. ISSN 0165-1684

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Abstract

The design of frequency invariant beamformers (FIBs) with off-broadside main beams is studied and it is shown that the required FIR filter length in this case should be much larger than the one with a broadside main beam. To reduce the computational complexity of such a beamformer and also improve its frequency invariant property at lower frequencies, two subband implementations are proposed. in the first one, the fullband array signals are split into subbands by a bank of analysis filters and the corresponding decimated subband signals form a series of subband arrays, Based on this standard subband structure, we then change the sensor spacings of different subband signals so that lower frequency bands have a larger spacing. which leads to a class of FIBs with scaled aperture with further improved performance at lower frequencies.

Item type: Article
ID code: 14652
Keywords: frequency invariant beamforming, broadband arrays, filter banks, subband beamforming, scaled aperture, Electrical engineering. Electronics Nuclear engineering, Signal Processing, Software, Computer Vision and Pattern Recognition, Control and Systems Engineering, Electrical and Electronic Engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 28 Jun 2010 11:38
    Last modified: 04 Sep 2014 23:45
    URI: http://strathprints.strath.ac.uk/id/eprint/14652

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