Radar intra pulse modulation recognition based on kurtosis weighted VMD and entropy features Liu Yuxin1,Tian Runlan1,Ren Lin1,Sun Liang2 ( of Aviation Operations and Services, Aviation University of Air Force, Changchun 130022, China; 2. Unit 93110 of the PLA, Beijing 100843, China) Abstract: In view of the difficulties in identifying the intra pulse modulation pattern of radar signal in complex electromagnetic environment and the limited recognition accuracy affected by noise, an identification method combining variational modal decomposition and entropy feature extraction is proposed. Firstly, the radar signal is decomposed by the improved VMD algorithm based on kurtosis weighting, and the optimal component set composed of three intrinsic mode function is obtained; secondly, the fuzzy entropy, permutation entropy and symbol entropy of each component are calculated respectively, so as to extract the entropy feature information; final