H∞ robust control synthesis for a fighter performing a coordinated bank turn

H^∞ synthesis techniques are used to design a bank angle autopilot which commands a coordinated bank turn. Two variations of the H^∞ design are compared to a multivariable classical design. Both of the H^∞ designs have better performance and actuator robustness measures. The first H^∞ design, however, contains an undesirable cancellation of a lightly damped Dutch roll mode, which causes a poor parameter robustness measure. The second H^∞ design corrects this problem by using the same inner loop yaw damper as used by the classical design