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

doi:10.1088/1674-1056/aca206

Abstract 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 frequency-aligned 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.

Keywords: linear frequency modulation (LFM) signal Duffing oscillator frequency periodicity parameter estimation

Received: 02 August 2022
Revised: 14 October 2022
Accepted manuscript online: 11 November 2022

PACS:	07.50.Qx	(Signal processing electronics)
	05.45.-a	(Nonlinear dynamics and chaos)

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

Corresponding Authors: Xiaopeng Yan
E-mail: yanxiaopeng@bit.edu.cn

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Ningzhe Zhang(张宁哲), Xiaopeng Yan(闫晓鹏), Minghui Lv(吕明慧), Xiumei Chen(陈秀梅), and Dingkun Huang(黄鼎琨) Parameter estimation method for a linear frequency modulation signal with a Duffing oscillator based on frequency periodicity 2023 Chin. Phys. B 32 080701

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

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