一种ISAR多目标实时成像方法

A Real-time Implementation Technique of Multi-target ISAR Imaging

本文提出了一种逆合成孔径雷达（ＩＳＡＲ）多目标的实时成像方案，它利用改进的加窗傅氏变换估计目标运动参数，并分离目标回波得到图像轮廓，然后用散射重心跟踪方法成像，得到较好质量的图像，其运算量较单纯用参数估计做运动补偿小得多，便于实时实现。

This paper presents a novel and efficient real-time multi-target imaging technique.First,the motion parameters of each target is estimated by applying a new time-frequency technique(the modified short-time Fourier'transform)to the received echoes. Then ,motion compensation is performed to get the image of the targets.Although the image is poor,the contour of target is distinguishable one from another.So we can get the signal of individual target by windowing. After applying a new ISAR motion compensation technique which called scattering centroid tracking to the windowed signal,we finally obtain the high-quality image of every target. Compared with the parameterbased (such as MLE)compensation, the proposed technique requires much less computation and is easy for implementation. Computer simulations have shown the effectiveness of the technique.