The Study Of Laser Fine Tracking Based On Adaptive Optics

With the development of the aerospace technology，the ability of obtainingspatial information has become one of the core of modern political and militarystruggle. For space target surveillance or for space laser communication, lasertracking is one of the key techniques. However, under the effect of the atmosphericturbulence, tracking precision of the traditional tracking approaches can hardly meetthe tracking requirements. After the emergence of adaptive optics, which can detectand correct the aberration caused by the turbulent atmosphere in real time，the laserfine tracking technology that combines adaptive optics and laser tracking techniquehas been developed. This thesis does some researches on the laser fine trackingapproach by means of theoretical analysis, simulations and experiments. The specificwork is as follows:The atmospheric turbulence was simulated by the phase screens which werederived from power spectrum inversion method. The laser transmission in the vacuumwas simulated based on the angular spectrum theory. Meanwhile，combined with alayered model, made the simulation studies on beam tilt caused by atmosphericturbulence. We conclude that the RMS of angle-of-arrival caused by the troposphereis around6μrad for1-Meter aperture receiving system. It will supply a reference tothe laboratory laser fine tracking experiments and the actual system design.The laser fine tracking experimental platform was set up to conduct experimentson static tracking and dynamic tracking. The turbulence was produced by a hot-windturbulence device whose characteristic parameters are consistent with the realatmospheric turbulence. The results show that the tracking precision of the statictracking has reached the resolution of the fast steering mirror (FSM), and the trackingprecision of the dynamic tracking is within the theoretical error of the system. Theexperiments verify the correcting capability of the laser fine tracking system for thebeam tilt caused by atmospheric turbulence.