基于声压梯度分析的小间隔直线阵端射波束形成

王冬海; 杨益新; 蒋 伟

doi:10.11993/j.issn.1673-1948.2008.05.009

基于声压梯度分析的小间隔直线阵端射波束形成

doi: 10.11993/j.issn.1673-1948.2008.05.009

西北工业大学声学工程研究所,陕西西安 710072

基金项目: 国家自然科学基金项目资助(10734030)，西北工业大学基础研究基金资助(W018101)

详细信息

作者简介:
王冬海（1981-) ，男，硕士，研究方向为阵列信号处理.

中图分类号: TB56
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出版历程
- 收稿日期: 2007-07-16
- 修回日期: 2007-09-23
- 刊出日期: 2008-10-30

End-fire Beamforming for Small Element Space Linear Arrays Based on Acoustic Pressure Gradient Analysis

Institute of Acoustic Engineering, Northwestern Polytechnical University, Xi′an 710072,China

摘要

摘要: 波束形成中波束图的主波束宽度和旁瓣级是最重要又相互矛盾的一对指标。直线阵在端射方向具有超增益现象，能够获得比常规波束窄得多的波束。而Dolph-Chebyshev等人提出的阵元幅度加权理论可以使得在主波束宽度一定的情况下获得最低的旁瓣级。本文结合两者的优点，提出了一种基于声压梯度分析的小间隔直线阵端射方向波束形成方法。该方法通过均匀直线阵的阵列流形提取出阵列中心点处的各阶声压梯度模态，然后在模态域进行Dolph-Chebyshev(DC)加权，再把模态域权值变换成阵元域权值。针对阵元间距小于半波长的直线阵进行了计算机仿真，仿真结果表明,该方法得到的波束图主瓣宽度远小于相同旁瓣级的常规DC加权波束图，有效提高了波束空间处理增益。
- DC加权 /
- 声压梯度 /
- 模态域 /
- 小间隔直线阵
Abstract: The main lobe width and side lobe level of beampattern are two most important performance measures in beamforming. Super-directivity beamforming method can gain a narrower main lobe compared with conventional beams at end-fire direction for small interelement space uniform linear arrays(ULAs), and the Dolph-Chebyshev(DC) amplitude weighting method can obtain the lowest side lobe level at specific main lobe width. A new beamforming method at end-fire direction for small aperture linear arrays based on acoustic pressure gradient analysis is proposed in this paper. The method combines the super-directivity theory and DC weighting method. The mode-filter matrix is used to extract higher order modes of pressure gradients at array center from the array manifold. The end-fire beam pattern is synthesized with DC weights in mode domain, and then the beam forming weights are transformed into element domain. Compared with the common DC weighted beam forming, this new approach can obtain better performance at end-fire direction. Simulation results show that this method is effective.
- Dolph-Chebyshev(DC) weighting /
- acoustic pressure gradient /
- mode domain /
- small element space linear array

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参考文献(5)

[1]	Schelkunoff S A.A Mathematical Theory of Linear Arrays[J].Bell System Technical Journal.1943,22(1):80-107.
[2]	Uzkov A I. An approach to the problem of optimum directive antenna design[J].Comptes Rendus Acadernie Sciences. URSS, 1946, 53(1):35.
[3]	Hines P C, Rosenfeld A L, Maranda B H, Hutt D L. Evaluation of the Endfire Response of a Superdirective Line Array in Simulated Ambient Noise Environments[C]. Oceans 2000 IEEE/MTS Conference and Exhibition.Sept 11-14, 2000, Vol3.Providence RI.USA,2000:1489-1494.
[4]	Dolph C L, A Current Distribution for Broadside Arrays Which Optimizes the Relationship between Beamwidth and Sidelobe Level[J].Proceeding of the IRE. 1946,34(6):335-348.
[5]	鄢社峰. 水听器阵列波束优化与广义空域滤波研究[D].西安：西北工业大学,2005.