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本文提出一种基于沙漏型变换的多舰船目标成像算法.对于近似为线性调频信号的舰船方位向回波,可以通过对其自相关函数进行沙漏型变换,解除其时延和时间的耦合,从而实现回波的相干积累,获得高质量的多舰船目标图像.文中对沙漏型变换的,变换后信号的聚焦特性及交叉项的影响进行了详细的分析,并且提出了一种适用于多舰船目标成像的尺度因子选取标准.“,”In this paper, a new algorithm based on sandglass transformation is presented for synthetic aperture radar (SAR) imaging of multiple ships. For cross-range signals of ship in the approximate form of linear frequency modulated (LFM) signals, the instantaneous autocorrelation function of signals is used to implement the sandglass transformation and decouple the time and lag time. Thus, cross-range signals can be integrated coherently and the multiple-ship image with high quality is achieved. In addition, a detailed analysis on the focusing characteristic of signal and the effect of cross-terms is presented, and a criterion of scaling factor selection for multiple-ship imaging is discussed.