Micro-motion feature extraction method based on concentration of spectrum

Aiming at the parameter estimation of multi-component micro-Doppler signal without flicker，a micro-motion feature extraction method of target based on the concentration of spectral was proposed． Firstly，the micro-Doppler modulation characteristics of the target were analyzed by the scattering point model．Then，the demodulation operator of the micro-Doppler signal was constructed by using the phase information of the slow time dimension of the target echo，and the singular value ratio spectrum method was introduced to estimate the main period component of the micro-Doppler signal to realize the dimensionality reduction and optimization of the search space． Finally，the parameters of blade number，blade length and initial phase were estimated by calculating the spectral concentration of the product of micro-Doppler signal and demodulation operator．Simulation results show that this method has high estimation accuracy，fast operation speed，and good robustness under the conditions of low signal to noise ratio and search grid mismatch. © 2023 Huazhong University of Science and Technology. All rights reserved.