基于椭圆逼近算法的低通IIR滤波器设计与实现

Design and Implementation of Low-pass IIR Filter Based on Ellipse Approximation Algorithm

为满足制导系统较高的实时性要求,结合视线角速率的时频域特点,提出一种基于椭圆逼近算法的低通无限脉冲响应(IIR)滤波器。首先根据输入信号的特性确定滤波器技术指标,然后计算得到滤波器系数,最后通过与不同IIR滤波器进行仿真对比和实测数据统计,验证该滤波器的性能。实验结果表明:该滤波器能够滤除信号中的高频噪声,具备良好的频率选择性和实时性,满足工程应用的需求。

In order to meet the real-time requirement of guidance system,a low-pass infinite impulse response(IIR)filter based on ellipse approximation algorithm is proposed according to the time-frequency characteristics of line of sight angular rate.Firstly,the technical specifications of the filter are designed with the characteristics of the input signal.Secondly,the filter coefficients are calculated.Finally,the performance of the designed filter is verified by comparing with different filters and the measured data statistics.The experiment results show that the filter can filter out the high frequency noise and has good frequency selectivity and real time,which can meet the requirements of engineering application.