Design and analysis of a digitally controlled integrated flight/firecontrol system

Abstract

An integrated flight/fire control system including a movable gun and gimbaled line-of-sight tracker was designed using root locus techniques for the inner analog control loops and discrete analysis of the sampled-data outer control loops. The control systems designed include a pitch orientational control system with an outer attitude control loop, a /?-/? lateral stability augmentation system with commanded yaw rate and a roll angle control system with an outer yaw attitude control loop, a velocity control system, a control loop for the movable gun, and the tracking control system. The tracking control system includes the digitally computed tracking control laws required to generate the inputs to the longitudinal and lateral flight control systems based on the tracking errors, the gimbaled tracker which provides line-of-sight information, and the digitally computed prediction angle. The discrete analysis was performed in the z plane using traditional methods as well as in the s plane using the Pad6 approximation to represent the e~Ts of the zero-order hold. A hybrid simulation showed that the system was capable of tracking a wide variety of target scenarios, including inverted flight to track an aircraft performing a split 5, with the gun on track for a major portion of each run.