基于多项式 Chirplet 变换的线性调频引信干扰波形设计方法

Aiming at the urgent needs of linear frequency-modulated fuze jamming technology in the modern battlefield environment, a method of polynomial Chirplet transform is proposed to estimate the signal parameters of frequency-modulated continuous wave (FMCW) radio fuze under low signal-to-noise ratio, and reconstruct the jamming signal for FMCW fuze. Based on the principle of linear wavelet transform, an appropriate kernel function is selected, the radio fuze signal is subjected to short-time Fourier transform after rotation and translation operations, and then the optimal parameters of transform kernel are obtained by genetic algorithm. The parameter estimation of FMCW signal is realized, and the jamming signal is reconstructed. The simulated results show that the proposed method can be used to accurately estimate the carrier frequency, modulation period and maximum frequency offset of FMCW radio fuze signal under a low signal-to-noise ratio, and the reconstructed jamming signal can produce a better jamming effect on FM fuze compared to the periodically modulated interference.