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在详细分析自旋目标窄带雷达回波特性的基础上,提出基于复数后向投影算法的自旋目标成像算法,由于该算法利用旋转散射点的相位进行匹配搜索成像,因此具有较高的分辨率以及成像效率.同时,本文分析了该算法的分辨率及其对雷达脉冲重复频率(PRF)的要求.若目标转速较高而系统PRF无法满足,则根据压缩感知理论以及自旋目标ISAR数据的稀疏性特点,建立了方位欠采样条件下的成像模型,并提出基于正交匹配追踪的自旋目标成像算法.不同条件下的仿真结果验证了算法的有效性.
Based on the detailed analysis of the echo characteristics of spin-target narrow-band radar, a spin-target imaging algorithm based on complex backward projection algorithm is proposed. Since the algorithm utilizes the phase of the rotating scatter point for matching search and imaging, it has higher resolution Rate and imaging efficiency.At the same time, this paper analyzes the resolution of the algorithm and its requirements on the pulse repetition frequency (PRF) of the radar.If the target speed is high and the system PRF can not meet, then according to the compressed sensing theory and spin target ISAR data , The imaging model under azimuth undetermined sampling condition is established and the spin target imaging algorithm based on orthogonal matching pursuit is proposed.The simulation results under different conditions verify the effectiveness of the algorithm.