Traditional adaptive wideband beamforming is difficult to be implemented with hardware, and has narrow null width in direction of interference. To deal with the problem, a novel null broadening wideband beamforming algorithm based on spatial response variation (SRV) constraint is proposed. Tapped delay-lines based systems are replaced with a structure based on sensor delay-lines (SDL). At the reference frequency, the beam response in the direction of interference is limited by using a maximum constraint. An SRV constraint based algorithm is used to broaden the region of nulls. An optimal weight vector is obtained using a convex optimization tool. Simulation results show that, with the proposed algorithm, null broadening and constant beam width can be realized at the same time of wideband beamforming. When null width is set to 10° and null depth is -30 dB, a measured null width of 14.7° can be obtained, and the system has a high output signal to interference and noise ratio (SINR).
ZHANG Wei, XU Lin, XU Quan-xin, WANG Yong
. Null Broadening Wideband Beamforming for SDL Based Array[J]. Journal of Applied Sciences, 2016
, 34(1)
: 12
-21
.
DOI: 10.3969/j.issn.0255-8297.2016.01.002
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