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

Ningzhe Zhang, Xiaopeng Yan, Minghui Lv, Xiumei Chen, Dingkun Huang

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1 Citation (Scopus)

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.

Original languageEnglish
Article number080701
JournalChinese Physics B
Volume32
Issue number8
DOIs
Publication statusPublished - 1 Aug 2023

Keywords

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

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