A dual fine tracking control system (FTCS) is developed for a single aperture optical communication receiver to compensate for high frequency disturbances a ect- ing tracking of two incident laser communication beams. The optical communication receiver resides within a payload module aboard a geosynchronous satellite, while each laser communication transmitter is housed within a module aboard a high alti- tude unmanned aerial vehicle (UAV). In addition to platform speci c disturbances, the impact of atmospheric optical disturbances a ecting tracking error are investi- gated. The system dynamics and FTCS are modeled and evaluated in MATLAB and SIMULINK. An optimal controller is developed to mitigate these disturbances and provide tracking errors commensurate with a bit error rate (BER) that does not exceed 10 6. Based on the respective optimal state estimates of each beam, the dual control technique regulates the ne tracking error for each beam by switching in time between each state estimate and applying linear quadratic regulator (LQR) control to a single fast steering mirror (FSM). Optical turbulence induced random beam wander e ects revealed limited impact to tracking error due to spatial separation between transmit- ters, due to the de ned communication architecture geometry. Moreover, simulation results indicated that dual control did not achieve the tracking error limit; however, single control of one beam at the cost of tracking error on the other beam, achieved a su cient temporal mean tracking error to meet the required BER
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Book Description BiblioGov, 2012. Paperback. Book Condition: New. This item is printed on demand. Bookseller Inventory # INGM9781249373858