The research on pre-aiming technology in space optical communication validation system

A new kind of pre-aiming method is proposed in this paper. The method which based on image identification and curve scanning is used to realize terminal auto-pointing in ground laser communication validation experiment. Firstly, detect position of indication cursor and reference cursor according to the color character of image, and then estimate the diameter of target circle. Propose a predictable parameter Hough transform algorithm, it can effectively reduce the void detection and can accurately identify the location of center. Then calculate compensate angle between the centre and indication cursor. Simulation platform respectively drives azimuth and pitch motors rotation compensation angle, so that the indicate laser will target terminal. At last, compare four kinds of capture scan mode, and give a capture beacon process with rose curve scan. Experimental results indicate that this method can detect the target exactly, and the calculate time is 0.59s; also it has perfect anti-jamming character. The method satisfies the requirements of auto- detect and rapid point between two communicate terminal.