基于Laguerre滤波的雷达通道均衡方法

摘要

传统雷达通道均衡采用自适应FIR滤波器作为均衡器,当理想脉冲响应序列很长时,其逼近效果不理想,计算量大.Laguerre滤波器兼具FIR和IIR结构的优点,通过在单位圆内固定一极点保证了系统的稳定,又因为引入了全通滤波环节,使其能够用较少的阶数逼近长脉冲序列响应.推导了Laguerre滤波器的自适应算法,并将其应用于雷达通道均衡中,仿真实验也证明了它与传统的FIR结构相比,用更少的系数获得了更优的对消比,达到了更好的均衡效果.%Adaptive FIR filters are used as the equalizer in traditional radar channel equalization. However, it has poor performance and low efficiency when the ideal impulse response sequence is long. Laguerre filters combine the advantages of FIR and IIR structures, which ensure the system's stability through the fixation of a pole in unit circle, and have lower order because of the introduction of the all-pass filters. In this paper, the Laguerre adaptive filter algorithm is derived and applied in the radar channel equalization. Simulations prove that Laguerre adaptive filters have better performance and lower computational complexity compared with the conventional FIR structure.