基于改进矩阵束的超宽带一维散射中心提取方法

In order to estimate the micro-motion parameters accurately and fleetly, an Ultra Wide Band (UWB) scattering center extraction algorithm based on Geometrical Theory of Diffraction (GTD) model and improved matrix pencil is proposed. The radial distance of the scattering center, the type parameters and the scattering intensity can be estimated simultaneously. The target GTD scattering model under UWB condition is transformed into a state space equation in this method, and the singular value decomposition is used to remove the noise component from the Hankel matrix. The generalized eigenvalue decomposition of the reduced Hankel matrix is performed, and the echo estimation is constructed by using the strongest scattering points in a single pulse, and then the radial distance estimation is obtained. Under the condition that the distance parameters are accurately estimated, the model parameters are decoupled so that the type parameters are separated from other parameters, and the type parameters are estimated by the least square algorithm and the search algorithm. Finally, the scattering intensity of the scattering center is estimated based on the least square method. The simulation results show that the improved matrix beam method has good robustness under low SNR, and can extract the target micro-motion distance, type parameters and scattering intensity with high precision.