摘要
对线性调频连续波(LFMCW,Linear Frequency Modulated Continuous Wave signal)信号进行参数估计是近年来电子侦察的研究热点问题。针对LFMCW信号在时频图上的分布特点,提出了一种基于改进SM(S-Method)的LFMCW信号参数估计算法,采用一种自适应窗宽的短时傅里叶变换(STFT,Short-time Fourier Transform)算法计算SM,抑制交叉项干扰的同时,提高时频分辨率,进而估计信号的参数。理论分析与仿真实验表明,提出方法能够在低信噪比下有效估计信号参数。
The parameter estimation of linear frequency modulation continuous wave（LFMCW） signal is a research hotspot in electronic reconnaissance systems. In this paper, the time frequency distribution feature of LFMCW signals is studied first. Based on the improved S-method（SM）, an algorithm for parameter estimation of LFMCW signals is proposed. It uses short-time Fourier transform（STFT） to calculate the SM with adaptive window width, which can suppress the crossterm interferences and improve the time-frequency resolution. Theoretical analysis and simulation experiment results demonstrate the validity of the proposed algorithm under low SNR.
作者
江莉
周军妮
杨润玲
刘利
Jiang Li;Zhou Junni;Yang Runling;Liu Li(School of Information and Control Engineering,Xi＇an University of Architecture and Technology,Xi＇an 710055,China)
出处
《系统仿真学报》
CAS
CSCD
北大核心
2018年第9期3283-3287,共5页
Journal of System Simulation
基金
陕西省教育厅专项科研计划(16JK1429)
关键词
线性调频连续波信号
时频分布
参数估计
S-方法
linear frequency modulated continuous wave signal
time frequency distribution
parameter estimation
S-method
