用滤波方法实现ISAR成像包络对齐

为了提高逆合成孔径雷达(ISAR)成像处理速度,提出一种基于滤波方法进行包络对齐的改进算法。该算法将互相关法与重心法相结合,首先估计出相邻回波的偏移量,再用滤波方法对距离像进行插值并且同时抽取,实现包络对齐,避免了直接对目标距离像插值而引起的计算量增加,有利于实时成像处理。最后通过对实测数据成像证明该算法的快速性和有效性。

Filtering method for range alignment in ISAR imaging

To increase the imaging speed of inverse synthetic aperture radars(ISAR),an improved range alignment algorithm based on the filtering method is proposed.The algorithm combines the cross-correlation method and the bary centre method to estimate the offset of echoes first.Then the echoes are interpolated and sampled to implement range alignment at the same time.This method avoids the additional computation by interpolating directly to the range profiles and adapts to the real-time imaging.Finally the real data processing results are given,which demonstrate the satisfactory effectiveness of the fast algorithm.