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Extra - Atmospheric Aircraft Control System Design Based on Loop Shaping Method

A robust automatic flight control system is designed for an extra-atmospheric aircraft. The control systems consist of attitude control system used modified -infinity loop shaping method and the navigation system used Modified Augmented Proportional Navigation (MAPN) guidance law. In the inner-loop design, using the H-infinity loop shaping method to transfer the transfer function matrix from the real system to the target system, which is a very useful way to solve the difficulties in choosing a proper weighting matrix in the loop shaping. In the outer-loop design, the MAPNG law is derived by adding the line-of-sight into the Augmented Proportional Navigation (APN) law in order to improve the observability of the system. Compared with the traditional method, the system using the new methods in control system design have a larger robust stability margin, the decoupling and the bandwidth of the system also improve a lot, the guidance accuracy and the miss distance accuracy is higher, furthermore, it reduces the complexity and blindness for the designer to find the proper weighting matrix. The simulation results proved the control performance of the unmanned aircraft system achieves a top level performance.