Optimal Recovery Trajectories for Automatic Ground Collision Avoidance Systems (Auto GCAS)
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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The USAFs F-16 Automatic Ground Collision Avoidance System Auto GCAS uses a single pre-planned roll to wings- level and 5-g pull-up to meet the operational requirements of being both aggressive and timely, meaning that extremely agile avoidance maneuvers will be executed at the last second to avoid the ground. There currently exists no similar Auto GCAS for manned military heavy aircraft with lower climb performance such as transport, tanker, or bomber aircraft. This research proposes a new optimal control approach to the ground collision avoidance problem for heavy aircraft by mapping the aggressive and timely requirements of the automatic recovery to an optimal control formulation which includes lateral maneuvers around terrain. Results are presented for representative heavy aircraft scenarios against 3-D digital terrain, which are then compared to a Multi-Trajectory Auto GCAS with ve pre-planned maneuvers. Metrics were developed to quantify the improvement from using an optimal approach versus the pre-planned maneuvers. The research results provide a basis to evaluate the expected performance of any future Auto GCAS for all aircraft.
- Military Aircraft Operations