一种双重滤波的LFM脉冲间隔和脉宽估计方法  

A Pulse Interval and Pulse Width Estimation Method for LFM Signals by Dual Filtering

作　　者：夏文杰 葛畅 乔正明 XIA Wenjie;CE Chang;QIAO Zhengming(Preparation Office of Zhangzhou Base,National Marine Technology Center,Xiamen 361001)

机构地区：[1]国家海洋技术中心漳州基地筹建办公室,厦门361001

出　　处：《舰船电子工程》2024年第11期182-185,共4页Ship Electronic Engineering

摘　　要：为解决低信噪比下线性调频(LFM)信号脉冲重复间隔和脉宽估计问题,论文提出一种基于分数阶傅里叶变换(FRFT)的双重滤波算法。该方法利用FRFT对LFM信号具有良好能量聚集性的特点,在最优分数阶域中对LFM信号实施分数阶滤波后再进行频域滤波,提升信号信噪比,提升脉冲重复间隔和脉宽估计精度。仿真实验和海试结果均表明,该方法能在低信噪比条件下实现LFM信号脉冲重复间隔和脉宽估计。To solve the problem of pulse repetition interval and pulse width estimation for linear frequency modulation(LFM)signals under low signal-to-noise ratio,this paper proposes a dual filtering algorithm based on fractional Fourier transform(FRFT).This method utilizes the energy aggregation of FRFT on LFM signals,and implements fractional filtering in the optimal fractional order domain followed by frequency domain filtering,which can significantly improve signal-to-noise ratio,the accuracy of pulse repetition interval and pulse width estimation is improved.Simulation and sea trial results show that this method can achieve pulse repetition interval and pulse width estimation of LFM signals under low signal-to-noise ratio conditions.

关 键 词：分数阶傅里叶变换 线性调频 脉冲重复间隔 脉宽 

分 类 号：TN911.23[电子电信—通信与信息系统]