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在大的目标观测视角下,为抑制散射中心的越分辨单元徙动影响,获得高质量的逆合成孔径雷达(ISAR)目标成像结果,不仅需要目标的相对转动信息,而且需要估计其等效旋转中心。该文通过等分目标回波获取2幅距离-D opp ler图像,并在图像域跟踪3个散射中心的位置变化信息,提出了一种目标转速和等效旋转中心联合估计方法。同时,分析了若干影响该方法性能的因素,为方法的正确实施提供了指导。数值仿真实验表明了等效旋转中心估计的必要性和本方法的有效性。
In the view of large target observation, in order to suppress the influence of the more resolvable cell migration of the scattering center and obtain the high-quality target imaging results of ISAR, not only the target relative rotation information but also the equivalent rotation center. In this paper, we obtain two distance-D opp ler images by equalizing the target echoes and track the position change information of the three scattering centers in the image domain. A joint estimation method of target rotation speed and equivalent rotation center is proposed. At the same time, a number of factors that affect the performance of the method are analyzed, which provide guidance for the correct implementation of the method. The numerical simulation shows the necessity of estimating the equivalent rotation center and the validity of the method.