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Efficient frequency invariant beamforming using virtual arrays

Pal, Piya and Vaidyanathan, P. P. (2010) Efficient frequency invariant beamforming using virtual arrays. In: 2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers. IEEE , Piscataway, NJ, pp. 1097-1101. ISBN 978-1-4244-9721-8.

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In wideband array processing, frequency invariant beamforming provides a popular means to make the beampattern allpass with respect to frequency. Traditionally, such beampatterns are realized as a two dimensional filter, using tapped delay-line (TDL) filters following each spatial sensor. However it has been recently shown that with the help of a rectangular antenna array, it is possible to generate fixed frequency invariant beampatterns without using filters. In this paper, this concept is generalized to the case of two dimensional arrays with elements on a (possibly nonseparable) lattice. Since performance of the frequency invariant beamformer depends on the number of sensors which could be large for a 2D array of size M × N, a novel approach to beamforming based on the difference co-array of a physical array is also proposed, which avoids use of additional physical sensors. The realization of the frequency invariant beams using second order statistics of the impinging signal with only M + N physical sensors, instead of the two dimensional array of size M×N, is demonstrated. The usefulness of the proposed method is verified through computer simulation.

Item Type:Book Section
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Vaidyanathan, P. P.0000-0003-3003-7042
Additional Information:© 2010 IEEE. Work supported in parts by the ONR grant N00014-08-1-0709, and the California Institute of Technology.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-08-1-0709
Subject Keywords:Frequency Invariant Beamforming, Two Dimensional Array, Lattice, Difference co-array
Record Number:CaltechAUTHORS:20170315-173417562
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Official Citation:P. Pal and P. P. Vaidyanathan, "Efficient frequency invariant beamforming using virtual arrays," 2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, 2010, pp. 1097-1101. doi: 10.1109/ACSSC.2010.5757573
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75165
Deposited By: Kristin Buxton
Deposited On:16 Mar 2017 16:35
Last Modified:09 Mar 2020 13:19

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