Sensors & Transducers Journal
(ISSN 1726-5479)
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205.767 |
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(ISSN 1726-5479) |
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Vol. 161, Issue 12, December 2013, pp. 408-412
Wideband Beamforming with Broad Nulls Based on Nested Array1 Mengxing LI, 1 Wanglan TIAN, 2 Longyang HUANG1 School of Communication & Electronic Engineering, Hunan City University, Yiyang 413000, China 2 Air Traffic Management College, Civil Aviation Flight University of China, Guanghan 618307, China
1 Tel.: +867376355019, fax: +867376353036
Received: 27 September 2013 /Accepted: 22 November 2013 /Published: 30 December 2013 |
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Abstract: A method for wideband beamforming with broad nulls of harmonic nested array is proposed. The harmonic nested array is composed of several uniformly-spaced linear subarrays, each of which processes an octave subband signal respectively. Nonuniform octave subband signals are implemented by general parameter filter banks with multirate method. Each subarray beamforming is carried out by space-frequency signal processing approach. We divide each octave subband into K frequency bins firstly. Secondly, the reference desired broad nulls pattern is designed with derivative constraints orthogonal method at the highest frequency bin. Thirdly, an IDFT on the samples of sampled the reference desired pattern with appropriate sample interval is performed to obtain the weightings for each frequency bin, then the DFT to find the pattern for corresponding frequency bin is taken. At last, combined all patterns of each frequency bin together the wideband pattern can be obtained. Each subarray is operating with the lowest rate in parallel. Weightings and patterns are realized by IDFT and DFT. These contribute to decreasing the computational load significantly and improving the speed and performances as well. Simulations show that the proposed beamformer is competent for broad nulls wideband beamforming with lower computation complexity.
Keywords: Broad null, Wideband beamforming, Subarray, Multirate method, General parameter filter banks, Nested array.
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