基于距离徙动轨迹的空间目标ISAR距离对准算法

摘要

针对空间目标的运动特征,通过研究目标距离徙动轨迹与等效运动模型,构建了一个欠定的运动方程组,基于全局熵最优化准则求解出目标运动参数,提出了一种全新的距离对准算法.实验结果表明,该算法具有较高的准确性,更重要的是,距离对准过程中不会引入距离像随机偏移误差和高频相位误差,这也是应用大转角高分辨成像方法的前提条件.%Aiming at the motion feature of the space and near space target, by studying the range migration trajectory and the equivalent motion model, a novel range alignment algorithm is put forword, which is based on the global entropy optimization criterion for solving underdetermined equations.Simulation and experimental results show that it is an efficient algorithm.More important, the random offset error and the high frequency phase error are not introduced, which is the precondition of applying the high-resolution imaging method.