Parameter estimation method for a linear frequency modulation signal with a Duffing oscillator based on frequency periodicity  

作　　者：张宁哲 闫晓鹏 吕明慧 陈秀梅 黄鼎琨 Ningzhe Zhang;Xiaopeng Yan;Minghui Lv;Xiumei Chen;Dingkun Huang(Science and Technology on Electromechanical Dynamic Control Laboratory,School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]Science and Technology on Electromechanical Dynamic Control Laboratory,School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Chinese Physics B》2023年第8期237-246,共10页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61973037)。

摘　　要：In view of the complexity of existing linear frequency modulation(LFM)signal parameter estimation methods and the poor antinoise performance and estimation accuracy under a low signal-to-noise ratio(SNR),a parameter estimation method for LFM signals with a Duffing oscillator based on frequency periodicity is proposed in this paper.This method utilizes the characteristic that the output signal of the Duffing oscillator excited by the LFM signal changes periodically with frequency,and the modulation period of the LFM signal is estimated by autocorrelation processing of the output signal of the Duffing oscillator.On this basis,the corresponding relationship between the reference frequency of the frequencyaligned Duffing oscillator and the frequency range of the LFM signal is analyzed by the periodic power spectrum method,and the frequency information of the LFM signal is determined.Simulation results show that this method can achieve high-accuracy parameter estimation for LFM signals at an SNR of-25 dB.

关 键 词：linear frequency modulation(LFM)signal Duffing oscillator frequency periodicity parameter estimation 

分 类 号：TN911.23[电子电信—通信与信息系统]