线性约束自适应逆波束形成研究

逆波束形成较常规波束形成有较好的方位分辨力,但其旁瓣较高,为抑制旁瓣并进一步提高阵增益和方位分辨力,本文提出一种自适应逆波束形成方法,通过设计自适应滤波器对虚拟阵列进行加权,提高阵增益和方位分辨力。理论分析表明自适应逆波束形成能够抑制旁瓣和噪声,阵增益较常规波束形成和逆波束形成提高约3 d B,数值仿真结果表明,自适应逆波束形成的旁瓣降低,阵增益和方位分辨力提高,实验数据处理结果表明自适应逆波束形成具有良好的方位分辨能力和目标检测能力,从而验证了其抑制旁瓣、提高方位分辨力和阵增益的有效性。

The study on linear constraint adaptive inverse beam forming*

Inverse beam forming(IBF) has higher azimuth resolution and higher side lobe than conventional beam forming(CBF). In order to inhibit side lobe and improve the array gain and azimuth resolution, adaptive inverse beam forming (AIBF)is presented. AIBF can improve the array gain and azimuth resolution by designing adaptive weighted filter for the virtual array. Theoretical analysis shows that AIBF can inhibit side lobe and noise. And the array gain can improve about three dB than CBF and IBF. The results of numerical simulation show that the side lobe of AIBF is reduced and the array gain and azimuth resolution is enhanced. The results of experimental data processing further show that AIBF has better azimuth resolution and target detection ability. The effectiveness of AIBF in inhibition of side lobe and improvement of azimuth resolution and array gain can be confirmed.