针对经典MTI 算法在处理某型微纳卫星拍摄的视频图像时存在较为耗时的现象，以及空间目标轨迹投影不连续造成无法使用连通域标记同一目标的问题，本文提出一种改进的MTI 算法用于空间目标检测。算法通过设计像素“感受域”，消除了空间目标轨迹投影不连续的现象。同时，在简化了像素时序信号投影的步骤后，仍能保留原算法对背景杂光和噪声的滤除作用，并使得算法速度得到提升。基于某型微纳卫星拍摄的视频图像进行算法实验，结果表明，本文算法对于轨迹投影不连续空间目标的检测无虚警，算法速度约为0.06 s/f。

An improved MTI algorithm is proposed in this paper to solve the problem of space objects detection in video satellite images. In order to detect the inconsecutive target’s trajectory, at the beginning of the algorithm we set a special preprocessing which is called pixel’s feeling domain. To reduce the time of the algorithm, we simplified the time projection part of the classic MTI algorithm, which is used to restrain the background. Finally, targets trajectories are obtained through connected domain detection. The experimental results show that, the improved MTI algorithm can effectively eliminate the background and is suitable for the inconsecutive target’s trajectory detection. In addition, the algorithm’s processing speed almost meets the real-time task.