基于迭代搜索的线性调频脉冲信号参数估计方法  

Linear Frequency Modulated Pulse Signal Parameter Estimation Based on Iterative Search

作　　者：邬俊阳 陈欣 WU Junyang;CHEN Xin(School of Electronic Information and computer engineering, Sichuan Institute of Industrial Science and Technology, Deyang 618500, China;School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China)

机构地区：[1]四川工业科技学院电子信息与计算机工程学院,四川德阳618500 [2]电子科技大学信息与软件工程学院,四川成都610054

出　　处：《探测与控制学报》2020年第4期39-46,共8页Journal of Detection & Control

基　　金：国家自然科学基金项目资助(61271250)。

摘　　要：针对分数阶傅里叶变换无法对线性调频(LFM)脉冲信号实现脉冲宽度和带宽估计问题,提出了基于迭代搜索的LFM脉冲信号参数估计方法。该方法首先依据分数阶傅里叶变换求取的调频斜率,按chirp相乘思想对原始数据进行处理,得到一组新数据;然后对新数据从起始点到终止点迭代处理,得到一组能量与频率和时间有关的二维数据;最后对二维数据进行差分处理,得到一组能量变化关系图,实现对LFM脉冲信号脉冲宽度估计,并依据事先估计出的调频斜率,实现对LFM脉冲信号带宽估计。数值仿真验证结果表明,在分数阶傅里叶变换无法获取处理数据中LFM脉冲信号脉冲宽度和带宽时,该方法可对LFM脉冲信号宽度和带宽等参数实现有效估计,并对起始频率实现了校正。For problem of pulse width and bandwidth parameter could not be estimated by fractional Fourier transform in LFM pulse signal,a parameter estimation method of LFM pulse signal based on iterative search was proposed.Firstly,according to chirp multiplication theory,a new set of data was got from the original data based on FM slope.Then,a set of two-dimensional energy data related to frequency and time was obtained by iterative processing the new data from starting point to ending point.Finally,a set of energy change diagrams was obtained by differential processing of the two-dimensional energy data to estimate the pulse width of LFM pulse signal,and the bandwidth of LFM pulse signal was estimated according to pre-estimated frequency modulation slope.Numerical simulation results showed that,when the pulse width and bandwidth of LFM pulse signal could not be obtained by fractional Fourier transform,this method could effectively estimate the pulse width and bandwidth of LFM pulse signal and correct the deviation of starting frequency.

关 键 词：线性调频脉冲信号 参数估计 分数阶傅里叶变换 能量变化 

分 类 号：TN911[电子电信—通信与信息系统]