In the paper , H∞ Control for Fast Steering Mirror of precision tracking in space optical communication tracking and pointing system is studied. A H∞ performance design problem based on the Incremental PI is described. It is also suggested that the design for Fast Steering Mirror H∞ performance can be formulated as a H∞ control problem, a uncertainty β factor is described.The performance β factor to system bandwidth and disturbance attenuation are revised and optimized appropriately, the factor decides the system bandwidth.The H∞ Controllers f or Fast Steering Mirror based on Incremental PI are solved.The method of H∞ Controllers is simple, easy to adjust, small overshoot and enabling high probability and fast establishment of laser communication links in intersatellite laser communication.
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