Autopilot Design For BTT Missile And Acceleration Estimation For Maneuvering Target

With the development of science and technology, especially aerospacetechnology, modern battlefield environment has become increasingly complex,which requires tactical missiles need to have a higher tactical and technicalindicators. In order to achieve effectively combat to future targets, tactical missilescan either improve own maximum available overload or try to reduce the neededoverload to achieve the guidance law. Due to its special shape, BTT missile mayachieve great lift in the main lifting surface. Because of the coupling betweenchannels, which can not be simply ignored, the design of BTT autopilot becomesmore complex. Compensation to the target acceleration in the guidance law mayreduce the needed overload for the missile to achieve the interception. However, thetarget acceleration can not be directly measured, which makes it needed to designfilters for the estimation of the target acceleration. The study of this article is justbased on the above background.First, we create the model of BTT missile, and simplify it under severalassumptions meeting the engineering requirements, followed by the couplingbetween channels will be analyzed.Second, under the premise of ignoring the coupling terms between channels,from the engineering applications’ point of view, we design controllers of threechannels separately based on classical frequency domain method. For the yawchannel, we design a feedforward compensator to maintain the sideslip angle beapproximately zero degree during the flight of the missile. Taking into account thecoupling between channels, we do joint simulations of three-channel in three cases,and analyse the results.Finally, to the target flying in near space with sine maneuver, we find that itsmodel is linear and depends only on the maneuver frequency. To the cases with itsmaneuver frequency known and unknown, we design filters respectively based onthe Kalman filter and the Interactive Multiple Model Kalman filter for the purposeof estimating the target’s acceleration. Numerical simulation will be done to verifythe effectiveness of the filters.