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.