From the Autopilot to Make Perfect Loops to the Anti-G-LOC GCAS: A Proposal to Augment the Flight Security

José Barahona da Fonseca, DEE Group Author

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The main result of our paper is a proposal of a ground collision avoidance system (GCAS) for fighter aircrafts that takes into account not only the limits of the aircraft but also the physiological limits of the pilot to avoid simultaneously the crash and the loss of consciousness of the pilot (G-LOC). This Anti-G-LOC GCAS is based on a detailed mathematical analysis of the recovery problem (flyup) and on a detailed model of the +Gz tolerance of the pilot. Our proposal has two main parts. In the first we solve the problem of the penetrating loops with an automatic pilot to generate perfect loops, i.e. circumferences. In the second part we solve the G-LOC problem. This last claim may seem a little bit bombastic. Obviously the G-LOC problem will not have solution while high performance aircraft have human beings inside. Even for pilots that support more than 20s with 9g of centripetal acceleration in the human centrifuge, there are reports of G-LOC episodes for 3g of centripetal acceleration. The problem that we solved is to maintain the risk of G-LOC in a given flyup under a certain level assuming constant the measured +Gz pilot tolerance with no risk of crash. To our knowledge this is the first proposal to solve simultaneously these two problems. Finally we make some detailed numerical simulations that confirm the effectiveness of our seminal system.
Original languageUnknown
Title of host publicationProceedings da Conferencia Engenharias 2009
Publication statusPublished - 1 Jan 2010
EventEngenharias 2009 -
Duration: 1 Jan 2009 → …


ConferenceEngenharias 2009
Period1/01/09 → …

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