基于MVDR的阵列信号波束域预处理算法

针对基于常规波束形成(CBF)的波束域方法在波束覆盖区域外存在方位不定强干扰源时多目标方位估计(DOA)失效的问题,提出采用最小方差无畸变响应(MVDR)的波束域预处理算法。该算法根据阵列接收数据自适应调整阵元权值,在波束覆盖区域外干扰源方位形成零陷,从而减小干扰对波束输出结果的影响。分析表明靠近波束覆盖区域的强干扰源对波束转换增益的影响有限。该算法进一步提高了波束域处理方法的抗干扰能力,仿真结果验证了该算法的有效性。

Beamspace pre-processing on array data based on MVDR

When strong interferences located on inconstant directions outside the beam coverage region, conventional beam-space pre-processing approach based on CBF is disabled on multi-targets DOA estimation. A beam-space pre-processing algorithm based on MVDR is proposed. The beamformer can adjust the array weight adaptively according to input data. So it forms zero-plots at locations that interferences are settled outside the beam coverage region to remove the contribution from them. Analysis show the influence introduced is acceptable even though strong interferes are close to beam coverage region. It improves anti-interference performance of beam-space methods. Computer simulation results prove its validity.