Adaptive sliding mode observer and control design for biased momentum satellites

A novel adaptive sliding mode observer is designed for momentum biased satellites attitude tracking control with unmeasurable yaw attitude information. The estimated yaw attitude information, derived by sliding mode observer (SMO) which designed based on measured value of roll and pitch axis, is applied to the design of three-axis attitude adaptive sliding mode controller through adaptive updating law. Through this method, the satellite three axis attitude is tracked effectively based on yaw attitude feedback information with no yaw sensors. Analysis and numerical simulation results indicate that the approach could estimate the yaw attitude information accurately and improve the tracking precision and robustness of biased momentum satellites compared with Luenberger observer.