Fan Junfang

On Control for Static Unstable Missiles

Some benefit results on control for static unstable missiles are established. Based on LTI model of missile plant, it validates complete controllability and existence for pole assignment by output feedback instead of state feedback. The focus is to examine the control effect of two and three loop autopilot on a static unstable missile and determine the proper control strategy from a control capacity perspective. It will be shown that there are transformations that can provide equivalent closed loop properties for the output feedback opposite to state feedback in missile control field. The open loop properties will be some different, however. The analysis is accomplished by establishing a standard algorithm in virtue of MATLAB for autopilot design. The simulation results are indicated that this method has well practicability and robustness.

Missile autopilot design using optimal control and frequency constraint

The benefits of relaxed static stability on missile were examined. Based on optimal control and open-loop crossover frequency constraint, an acceleration autopilot design methodology was developed and applied to a highly unstable airframe. Performance and robustness comparisons for three autopilot topologies were made. The analysis reveals the topology origin of classic three-loop autopilot, and simulation results show that the four-loop topology looks very promising.