%0 Journal Article %T A New Backstepping Sliding Mode Guidance Law Considering Control Loop Dynamics %J علوم و فناوری فضایی %I انجمن هوافضای ایران- پژوهشگاه هوافضا %Z 2008-4560 %A بهنام گل, وحید %A ولی, احمدرضا %A محمدی, علی %D 2016 %\ 01/01/2016 %V 8 %N 4 %P 9-17 %! A New Backstepping Sliding Mode Guidance Law Considering Control Loop Dynamics %K Guidance law %K Control loop dynamics %K Sliding mode control %K Chattering %R %X In this paper, a new procedure for designing the guidance law considering the control loop dynamics is proposed. The nonlinear guidance loop entailing a first order lag as the control loop dynamics is formulated. A new finite time and smooth backstepping sliding mode control scheme is used to guarantee the finite time convergence of relative lateral velocity. Also in the proposed algorithm the chattering is removed and a smooth control signal is produced. Moreover, the target maneuver is considered as an unmatched uncertainty. Then a robust guidance law is designed without requiring the precise measurement or estimation of target acceleration. Simulation results show that the proposed algorithm has better performance as compared to the proportional navigation, augmented PN and the other sliding mode guidance law. %U https://jsst.ias.ir/article_15236_3df76c834ee785c1f62dbc47f0af52c0.pdf