一种提高分裂阵频域波束形成测向分辨力的方法

发布时间：2018-03-01 20:31

本文关键词： 频域波束形成测向分辨力超波束互谱分裂阵　出处：《舰船科学技术》2016年23期 　论文类型：期刊论文

【摘要】：为了提高声呐系统对目标方位的分辨能力,本文提出一种分裂阵频域波束形成方法,即超波束互谱测向法。通过将超波束方法得到的方位谱加权到互谱方法得到的波束形成结果上,从而得到最终的波束输出结果。超波束互谱测向方法的优点是既能够降低主瓣宽度,抑制旁瓣,提高测向分辨力;又能够保留相位信息,为后续谱分析应用提供参考。实验室水池测试结果表明,利用阵元间距为0.016 m的16元均匀直线阵,对于37.5 k Hz的声信号,采用超波束互谱方法进行波束形成与单纯采用互谱方法进行波束形成相比较,在0°和60°方位上的波束主瓣宽度分别减小了3.8°和6.9°,旁瓣幅度降低超过30 d B,测向分辨力得到明显提高,从而验证采用超波束互谱测向方法提高测向分辨力的可行性和有效性。
[Abstract]:In order to improve the ability of sonar system to distinguish the target azimuth, a split-array beamforming method in frequency domain is proposed in this paper. By weighting the azimuth spectrum obtained by the hyperbeam method to the beamforming result obtained by cross-spectral method, The advantages of the super-beam cross-spectral direction finding method are that it can not only reduce the width of the main lobe, suppress the sidelobe and improve the resolution of direction finding, but also retain the phase information. The results of laboratory pool test show that the uniform linear array of 16 elements with a spacing of 0.016 m is used for 37.5 kHz acoustic signals. The superbeam cross-spectral method is used to beamforming, and the cross-spectral method is used for beamforming alone. At 0 掳and 60 掳azimuth, the width of the main lobe is reduced by 3.8 掳and 6.9 掳, the amplitude of the sidelobe is reduced by more than 30 dB, and the direction finding resolution is obviously improved, which verifies the feasibility and effectiveness of using the super-beam cross-spectral direction finding method to improve the direction finding resolution.
【作者单位】：大连测控技术研究所;
【分类号】：TB56

【相似文献】