| Citation: | ZHU Zhiqiang, HOU Jian, YAN Xiaopeng, et al. Small-scale periodic state Duffing oscillator FMCW fuze signal detection at ultra-low SNR[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(10): 2069-2078. doi: 10.13700/j.bh.1001-5965.2019.0032(in Chinese)
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Aimed at the problem that the signal of frequency-modulated continuous wave (FMCW) fuze is very difficult to detect at ultra-low signal to noise ratio (SNR), a detection system based on small-scale periodic state Duffing oscillator is established. This system combines Duffing oscillator characteristics with stopping oscillation system theory, eliminating the inherent deficiencies of the traditional transformation-dependent Duffing oscillator detection methods, extending the frequency detection range through a single Duffing oscillator, and reducing the computing cost. On this basis, the phase trajectory characteristics of the small-scale periodic state are analyzed, and then a FMCW fuze signal detection method based on small-scale periodic state Duffing oscillator is proposed. The experimental results show that the small-scale periodic state Duffing oscillator detection method has an average detection error of less than 1% for the real FMCW fuze radiation signal at -30 dB ultra-low SNR, which verifies the effectiveness of the proposed method.
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