自适应Notch滤波器在阵列信号处理中的应用

为了不增大阵列尺度采用信号处理方法得到高分辨率的波束指向性,首先利用Notch滤波器的＂离线重构＂实现窄带波束形成,进而结合其瞬时相位估计方法,研究了基于自适应Notch滤波器的恒定束宽波束形成技术,利用信号处理方法将矢量传感器阵列接收的低频窄带信号转化为具有指向性的较高频率波束,并采用虚拟阵元技术消除波束栅瓣的影响,给出了实际应用中具体的信号处理方法。仿真和湖试验证表明这种基于自适应Notch滤波器的恒定束宽波束形成方法是合理可行的。最后,针对适应实时信号处理的要求提出将这种方法与目标自动跟踪系统相结合的改进方向。

Application of adaptive Notch filter in signal's processing of array

In order to gain the beam-forming directivity of distinguishing two underwater objects without greatly increasing the array size, a narrow-band beam-forming algorithm is achieved by "reconstitution" via adaptive Notch filter. Combined with instantaneous phase computation of Notch filter, a constant beam-width beam-forming method based on adaptive Notch filter is studied, which can gain high-frequency beam-forming directivity from low-frequency narrow-band signals received by vector array. The imagined-sensor technology is performed to eliminate sidelobes, and the actual signal processing method in experiments is described. Simulation and experiments show that the proposed method based on adaptive Notch filter is reasonable and feasible, and can be integrated with the automatic target tracking system to satisfy the request for real-time operation.