Hi-speed fine tracking pointing control for IOC

A real-time algorithm is proposed for pointing, acquiring, tracking and predicting the laser spot in intersatellite optical communications (IOC) system. Since the approximate position of laser spot was acquired by grid scanning in the max interest area of CCD, a tracking window was covered with the target. The best image segmentation threshold was generated based on the Ostu image segmentation algorithm. Due to the threshold, the centric theory was used for calculating the exact position of laser spot within an image of tracking window. In case of attaining the actual location data of the target, the coming position of the laser spot can be provided. This drives the system to operate on predicting the state and improving the responsive bandwidth. The results show that the speed of image processing is up to 625 frames/s when the tracking window is set to 100 × 100.