Disturbance observer based finite-time coordinated attitude tracking control for spacecraft on SO(3)

Stochastic Robust H∞ Decentralized Network Formation Tracking Control of Large-Scale Team Satellites via Event-Triggered Mechanism

“…Remark 13: The robustness ρ i of H ∞ control, the upper bound τ i M the time-varying delay and the upper bound δ i M packet-dropout will determined the feasibility of LMIs in (35). There exists a tradeoff between ρ i and τ…”

“…should be more small in (35), in order to maintain the feasibility of LMIs in (35). In other words, the upper bound of delay and packet-dropout also impact on the feasibility of the LMI.…”

“…In other words, the upper bound of delay and packet-dropout also impact on the feasibility of the LMI. According to the properties of LMI, the LMI constraints in (35) will become infeasible if the upper bound of delay and packet-dropout are both large for a specificed attenuation level ρ i of decentralized H ∞ team formation tracking control of satellites.…”

“…( 35) will be enlarged. Moreover, the effect of the event-triggered mechanism, the external disturbance, the coupling, the timevarying network induced delay, the internal random fluctuation, and the packet-dropout are simultaneously considered in the LMI in (35). From the LMIs in (35), if the attenuation level ρ i increases in ( 17), the threshold parameter ϕ i of event-triggered mechanism in ( 23) decreases, interaction parameters C−im from other satellites decrease and the maximum network-induced delay τ i M in ( 13) decreases, then the feasibility of LMIs in (35) will increase and vice versa.…”

“…To address these issues, the robust H ∞ control strategy has been adopted as an efficient control scheme to attenuate the worst-case effect of external disturbance on the system. The robust spacecraft attitude tracking control with adaptive control law [34] and sliding mode control law [35], has been discussed.…”