STFT数字信道化的雷达脉冲参数测量改进算法

摘要

Digital channelization technology is an important part of modern radar detection system,short-time Fourier transform(STFT) algorithm is used for digital channelization.The digital filter banks constructed by this algorithm are characterized by the same filter characteristics and less computation.The parameters of the input pulse signal can be determined by measuring the output of the filter bank,however,the parameter error of the algorithm between the receiver intercept pulse signal and the actual pulse signal is large.To improve the parameter measuring accuracy,an improved algorithm based on STFT channelization of the radar pulse parameter measurement is proposed.In this method,the Haar wavelet transform is used to extract the pulse arrival time accurately,and an accurate measurement of pulse signal amplitude is made by correlation accumulation.The validity of the algorithm is verified by simulation analysis.%数字信道化技术是现代雷达侦测系统的重要组成部分,短时傅里叶变换(STFT)算法是实现数字信道化常用的一种算法.该算法所构建的数字滤波器组具有滤波特性一致、运算量少的优点,通过测量滤波器组的输出可以确定输入脉冲信号的参数,然而该算法对于接收机截取的脉冲信号与实际脉冲信号不匹配所测量的参数误差较大.为改善参数测量精度,提出了一种基于STFT信道化的雷达脉冲参数测量的改进算法,该方法在信道化基础上引进Haar小波变换对脉冲到达时间精确提取,通过相关累加对脉冲信号幅度精确测量.通过仿真分析验证了算法的有效性.