An attitude control system for cubesat satellites using an adaptive L1 norm control method

Abstract

After modeling the satellite attitude dynamics as a rigid body system and applying to it the L1 norm control method, simulation software was developed and corresponding results were obtained. As these results were not considered a good tracking of reference command signals, contradicting authors of reference [Cao 2015], a variant within the frame of L1 adaptive method was employed to solve the satellite attitude control problem (SACP). This variant has not been employed in the literature for SACP. Even though reference command tracking was still unsatisfactory. Other similar systems were tested, verifying simulation software and L1 norm adaptive control implementation against reported simulations in the literature [Kharysov, et al, 2010], [Lavretsky et al, 2008], reproducing their results [Castellanos et al, 2017]. Although L1 filters design and specification for unmatched nonlinearities remains and open question, good tracking depends on L1 filtering, and general conclusions for different systems and the type of systems like satellite attitude has been obtained. General modifications to L1 adaptive control algorithm are explored in this thesis in chapter XIX, and corresponding simulation software is developed. A general conclusion balance is expressed in chapter XX.