摘要:
为解决常规波束形成后干扰抵消方法仅能从目标波束内消除一个干扰影响的局限性,提出了一种可实现多干扰抑制的波束形成后干扰抵消方法,用于解决多干扰条件下的弱目标波束形成问题.该方法通过最小化多个干扰波束对目标波束的影响,获得用于抵消干扰波束的加权值;然后从目标波束中减去加权后的干扰波束,从而获得抑制干扰后的目标波束。该方法继承了常规波束形成方法的稳健性,因此在阵列流型失配等存在误差的条件下可以用于目标波束形成。仿真和海上实验数据表明,与最小方差无失真响应方法和解卷积的常规波束形成方法相比,该方法可以有效抑制干扰的影响,且当目标与任一干扰方位相近时,其方位谱中可以观察到目标波束,而另外两种方法的目标波束均被干扰波束或其旁瓣所掩盖;与设置凹槽的波束图综合方法相比,该方法算法复杂度低,计算速度快,稳健性更好。
关键词:
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多干扰
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干扰抵消
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波束形成
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稳健性
Abstract:
Conventional Postbeamformer Interference Canceler(PIC) can effectively subtract the weighted interference beam from the target beam but is restricted to the case of one interferer.This paper extends the PIC to deal with multiple interferers(PIC-N),which is derived by minimizing the output of target beam subtracted by weighted interference beams.As the steer vector of the PIC-N is the same as the Conventional Beamforming(CBF),the PIC-N is also robust to practical issues,e.g.,array manifold mismatch.The PIC-N is compared with the Minimum Variance Distortionless Response(MVDR) method and the recent Deconvoloved Conventional Beamforming(dCv) method using simulations and experimental data obtained in deep ocean.The PIC-N shows advantages of suppressing a substantial amount of the interference from the multiple interferers to present a distinguishable target beam especially when the target direction is close to one of the interferer directions.Furthermore,compared with the Array Pattern Synthesis(APS) that has stop bands at the interferer angles,PIC-N is more simple and robust.
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