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 0165-1684Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|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|
|Depositing user:||Strathprints Administrator|
|Date Deposited:||28 Jun 2010 10:38|
|Last modified:||07 Oct 2016 02:16|