基于零点约束的宽带时域波束形成器设计

Design of Broadband Time Domain Beamformer Based on Zero Point Constraint

针对强干扰环境中弱目标信号检测,通道幅相误差制约宽带阵列干扰抑制能力问题,基于分步设计思想提出一种零点约束宽带时域波束形成器设计方法。通过在强干扰方位区间设置零点约束条件并结合阵列通道误差校正构建通道期望频率响应,采用任意幅相响应FIR滤波器实现宽带时域波束设计,数值仿真分析零点约束算法对通道幅相误差敏感引起干扰抑制和目标检测性能下降,该设计方法可有效补偿误差保证零点约束性能提升目标检测能力,仿真结果验证了设计方法的有效性。

In order to detect the weak target in strong interference environment,channel amplitude and phase errors constrain the broadband array capability of interference suppression,a design method is proposed for zero constrained broadband time-domain beamformer based on step-by-step design concept.By setting zero constraint conditions in strong interference azimuth range and combining array channel error correction to construct the excepted frequency response of the channel,broadband time-domain design using FIR filters with arbitrary amplitude and phase response.Numerical simulation analysis shows that zero constraint method are sensitive to channel errors,which reduced the interference suppression and target detection performance,proposed method can prioritize error compensation to ensure zero constraint performance and improve target detection ability,the simulation results validate the effectiveness of the design method.