Design of line-of-sight stabilized control system using inertial and optical-mechanical combined method

To improve the stability accuracy of stable platform of unmanned aerial vehicle (UAV), a line-of-sight stabilized control system is developed by using an inertial and optical-mechanical (fast steering mirror) combined method in a closed loop with visual feedback. The system is based on Peripheral Component Interconnect (PCI), included an image-deviation-obtained system and a combined controller using a PQ method. The method changes the series-wound structure to the shunt-wound structure of dual-input/single-output (DISO), and decouples the actuator range and frequency of inertial stabilization and fast steering mirror stabilization. Test results show the stability accuracy improves from 20μrad of inertial method to 5μrad of inertial and optical-mechanical combined method, and prove the effectiveness of the combined line-of-sight stabilization control system.