A Coordinated BTT Autopilot Design for Airborne Dispenser Using H_∞ Method

As far as bank to turn missile is concerned, it is imperative to make sideslip angle as small as possible. And this also is a critical issue for BTT steering pilot to restrict sideslip angle resulting from rapid roll maneuvers. In this paper, H_∞ controllers with high robustness are designed for pich, yaw and roll channel respectively using decoupled linear time invariant model. Model parametric variations from aerodynamic coefficient uncertainty are taken into consideration. Then a coordinated branch is introduced into the yaw channel in order to limit the sideslip angle. Simulation results show that this method makes coordinated BTT autopilot design easier,and can get a good result that meets the requirements of BTT control.