基于模糊逻辑控制的自适应锁相环设计

Adaptive PLL Design Based on Fuzzy Logic Control

针对某型雷达在航天器频率的跟踪测量过程中,由于目标动态变化影响较大,存在跟踪稳定性较差、测量精度偏低的问题,提出了对雷达锁相跟踪环路采用模糊逻辑控制的自适应变带宽设计。该方法主要是通过引入模糊逻辑控制器,利用输入值适配控制规则,为每个控制规则确定其适配程度,并且采过加权计算合并规则的输出,控制环路滤波器的系数,从而自动调整环路带宽,达到增强雷达设备频率跟踪稳定性和提高测量精度的目的。仿真结果表明,模糊逻辑控制自适应变带宽锁相环跟踪目标的稳定性和测量精度都优于传统锁相环。

An adaptive bandwidth PLL design based on fuzzy logic control is presented to solve the problem of poor tracking stability and low accuracy when a certain type of radar is tracking dynamic spacecraft.This method is implemented mainly through a fuzzy logic controller,adaptive level is determined by control rule of input and the outputs of rules are combined through weighted calculation to control the coefficient of loop filter,thus adjusting automatically the loop bandwidth,enhancing the tracking stability of radar equipment and improving ranging accuracy.The simulation results show that the adaptive bandwidth PLL based on fuzzy logic control has higher tracking stability and accuracy.