基于广义旁瓣相消器的滤波器组旁瓣干扰抑制

Side-lobe Inteference Suppression for Filter Banks Based on GSC

传统滤波器组为降低旁瓣,需要提高滤波器阶数。该文将广义旁瓣相消的思想运用于滤波器组的旁瓣干扰抑制,在滤波器通带外的干扰信号频率处自适应形成零点。基于LMS算法,该文提出了基于自适应旁瓣相消器的滤波器组旁瓣干扰抑制算法,给出了算法的矩阵形式。通过限制系数长度,旁瓣相消器仅仅对消旁瓣大功率干扰信号,而对带内有用信号的影响很小,其作用相当于用一个低阶滤波器实现一个高阶数滤波器的功能,当信号功率较之干扰功率很小时尤其有用。仿真结果显示算法具有良好的旁瓣干扰抑制性能,较之高阶滤波器组大大减少了计算量。

In order to improve side-lobe performance,traditional filter banks have to increase order number.In this paper Generalized Side-Lobe Canceller（GSC） is introduced to cancel strong jamming signals from side-lobes of filter banks,which can place zeros at stop band adaptively.The matrix form of this adaptive algorithm is provided,based on LMS algorithm.The length of the canceller coefficients is confined so the canceller just cancels strong jamming signals,with little influence on pass band signals.This method realizes the function of high-order filter banks through low-order filter banks and especially suited for weak signal detection.The simulation analysis indicates that it reduces computation quantity relative to high-order filter banks but maintains the same performance.