Minature Interceptor Guidance and Control Using Second Order Sliding Mode and Adapative Control

Abstract

The design of a beam -rider guidance and control for a miniature projectile launched by 40 mm smooth bore gun conc ept with hit -to -kill accuracy based on second order sliding mode control and Linear Adaptive control is presented. A disturbance observer estimates normal and transverse distances of the projectile from the centre of the beam and corresponding rates. A rob ust second order sliding mode beam -rider guidance steers the projectile in error space to desired sliding surface and maintains it thereafter. Finally the robust second order sliding mode autopilot tracks angle -of -attack and sideslip commands generated by the guidance. A second order sliding mode roll command de -spins initial eventual projectile and keeps the desired roll -angle thereafter. The “ideal” sliding mode control design is then re -designed using Linear Adaptive Control techniques, which do not requ ire very fast sampling rates as sliding mode control. The work develops previous student project in the areas of guidance and control and aerodynamics. Results obtained show that the proposed guidance and control concept can achieve sub -metric miss distanc es against short range targets.