分析了影响大气层内扩展目标成像对比度的主要因素, 研究了整体倾斜校正对扩展目标对比度影响的数学关系, 并分析了采用绝对差分算法提取整体相位倾斜的复杂度优化问题。采用快速倾斜镜对成像光束整体倾斜进行校正能够提高扩展目标的成像对比度, 降低后端数字图像处理的难度, 进一步减少目标识别和跟踪所需要的时间,对提高低对比度目标的光电跟踪效率具有参考意义。

The main factors that have effect on image contrast of extended objects in atmosphere were analyzed.The influence of tilt removal to the image contrast was mathematically investigated, and the optimization of using the absolute difference algorithm for obtaining the tilt was studied.Tilt removal of imaging beam by using a fast steer mirror could enhance the image contrast of extended object, facilitate the later digital image processing, and reduce the time cost for target recognition and tracking, thus it is valuable for improving the photoelectric tracking efficiency of low-contrast extended object.