(2017 i`na 15) f"ryz ,xii`a h''i

Title:

Cooperative Nonlinear Guidance Strategies for Aircraft Defense

Speaker:

Shashi R. Kumar

,aia` xhqnq

Technion

Time:

Monday, May 15, 2017, 15:30 Refreshments will be served before the seminar

Place:

Room 217, D. Dan and Betty Kahn Bld, Technion

Abstract: Modern missiles, equipped with advanced technologies, are becoming a serious threat for both civil as well as military vehicles. In the aerial scenario, the aircrafts use passive measures such as flares and chaff to decoy the incoming missiles and perform evasive maneuvers in order to increase their own survivability. But such countermeasures may not be efficient to provide satisfactory protection against highly sophisticated missiles. An alternative option could be to use an active aircraft protection where the aircraft launches a defender missile as a countermeasure against the incoming missile. In this talk, nonlinear guidance strategies for an active aircraft defense will be presented. The guidance system offers an additional degree of freedom due to two available controls, the lateral accelerations of defender and target. This extra degree of freedom is utilized in various ways to design guidance strategies. These guidance strategies, in addition to each ensuring interception of missile, also individually allow 1) to reduce sensitivity of guidance law to erroneous time-to-go estimates, 2) the target to perform optimal evasive maneuvers, and 3) either of the target or the defender to maneuver independently with their maximum limit. These guidance strategies are designed in a nonlinear framework, using sliding mode control technique, with relevant zero effort variables as switching surfaces. The efficacy of the proposed guidance strategies will be validated through numerical simulations. The protection envelopes, which depict the variations of minimum target- missile distance with respect to heading angle of missile to ensure successful interception, will also be presented.