Switching logic design based on finite-time gain measure for a flight vehicle with multiple actuators

In this paper, the control allocation problem is discussed for a flight vehicle with multiple actuators, that is lateral jets and aerodynamic fins. The usage of aerodynamic surface is not constrained, while the usage of lateral jets has to be minimized due to the limited amount of fuel available on-board. A switching logic is employed to allocate the two actuators optimally. We formulate the control system of terminal guidance as a time-varying one. The switching control strategy is divided into two phases, and lateral jets and aerodynamic fins are adopted separately in respective phases. The switching logic, from one phase to another, is designed based on finite-time gain measure.