中文说明：relax算法进行稀疏重构，对散射中心进行GTD建模，估计散射中心的位置幅度，散射类型，进行散射中心的重构。当所得回波缺失的情况下，该算法依然能准确重构回波
English Description：
Relax algorithm is used for sparse reconstruction, GTD modeling is used for scattering center, position, amplitude and type of scattering center are estimated, and scattering center is reconstructed. When the echo is missing, the algorithm can reconstruct the echo accurately