DIGITAC Multimode Control Laws

The DIGITAC system executes multiple control laws, each tailored to specific mission tasks. The available augmentation modes include the standard control augmentation mode for the A-7D aircraft, a “flight path” mode, and a “precision attitude” mode. Synthesis and development of the control laws for these modes are described within this paper. Also described are unique filtering, amplitude sensitive performance, and robust directional control. It was demonstrated that the standard flight modes were executed by the digital system in an un-degraded manner. Major performance improvements were produced for gunnery tasks by the precision attitude mode.