Compound Control Of Near-space Interceptors With Lateral Jets And Aerodynamic Fins

With increasing attention of the near space,more and more countries such asthe U.S,Russia and other countries have already made a series of achievementsespecially in hypersonic aircraft. Although such researches mostly stay in the stageof theoretical investigation and experimental verification, they will be a huge threatof the security of homeland in the foreseeable future. As a defense-oriented country,we have to follow up on the relevant dynamic of the foreign researches and do somerelative researches on the technology of interception. The compound control systemwhich we designed can improve the response speed of the system, thus, thecompound control system can track the guidance commands rapidly and improve theintercept accuracy.Since the control system has both discrete and continuous control variables, weneed to deign both discrete controller and continuous controller to realize thecompound control. The main idea of the compound system is to deign discretecontrol loop after deigning the continuous control loop. We deign two differencecompound systems based on this structure.The first compound control system which we designed is based on the classicalfrequency domain correction method. The compound system have two path,thediscrete path and the continuous path,both the two path have two loop, the innerloop is the angular velocity feedback, and the outer loop is the overloadfeedback.Using the MATLAB SISOTOOL to design the system controllers, thenthe compound system can achieve reasonable dynamic performance and steady-stateperformance.The second compound control system which we designed is based on thesliding mode variable structure (SMVSC). The aerodynamic control loop is based oncontinuous sliding mode variable structure control methods and the direct forcecontrol loop is based on the discrete sliding mode variable structure control methods.After designing the continuous loop and discrete loop, we verified the effectivenessof our algorithm through the integrate simulation.At the end of paper we analysis the robustness of the compound control systemwith the parameters perturbations. The simulation results demonstrate that thecompound control system can overcome the effects of the parameters perturbations.