A new Method for Identification of In-pulse Modulation of Radar Signals

In order to resolve the problem of radar in-pulse modulation feature recognition under low signal-to-noise ratio, a new automatic recognition algorithm was proposed. Firstly, the phase difference method and short-time Fourier transform (STFT) are improved to improve the feature extraction ability of phase coded signal and frequency modulated signal respectively. Then, the hierarchical decision-making method is used to recognize the in-pulse modulation feature. The simulation results show that the algorithm has obvious classification characteristics, and the total recognition result is close to 100% when the SNR is 3dB. Moreover, the algorithm requires less computation, so it has certain application value.