Observer-based delayed feedback attitude control for single- and multi-actuator maneuvers

Observer-based attitude controllers for single- and multi-actuator maneuvers are developed from the delayed state feedback control laws obtained by the Lyapunov-Krasovskii functional and inverse dynamics approaches, respectively. The TRIAD algorithm is employed to process the observations. The observer gain is selected based on the extended Kalman-Bucy (EKB) filter, and a novel delay estimation approach is used to provide the estimates of the delay. The observer-based delayed feedback control laws are shown to be capable of accurate control of spacecraft attitude from noise-corrupted attitude measurements.