Abstract
To solve the problem of discrimination of non-cooperative pulse signals type, a frequency modulation pulse type discrimination method based on time-frequency analysis is proposed. The instantaneous frequencies of linear frequency modulation (LFM) pulse and hyperbolic frequency modulation (HFM) pulse are estimated by using Rife interpolation short-time fractional Fourier transform-variable weight fitting method. By comparing the root mean square error between the estimated instantaneous frequency and the reciprocal fitting instantaneous frequency, the types of LFM pulse and HFM pulse signals are accurately distinguished. The simulation results show that this method has higher accurate discrimination probability under lower signal-to-noise ratio (SNR).
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