Accession Number : ADA618503


Title :   Optimal Recovery Trajectories for Automatic Ground Collision Avoidance Systems (Auto GCAS)


Descriptive Note : Doctoral thesis


Corporate Author : AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Suplisson, Angela W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a618503.pdf


Report Date : Mar 2015


Pagination or Media Count : 226


Abstract : The USAF's 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.


Descriptors :   *COLLISION AVOIDANCE , *TRAJECTORIES , AIRCRAFT , AUTOMATIC , AVOIDANCE , BOMBER AIRCRAFT , CLIMBING , CONTROL , FORMULATIONS , GROUND LEVEL , MANEUVERS , MANNED , OPTIMIZATION , RECOVERY , REQUIREMENTS , ROLL , SCENARIOS , THESES , TIMELINESS , TRANSPORT


Subject Categories : Military Aircraft Operations


Distribution Statement : APPROVED FOR PUBLIC RELEASE