Event-triggered robust model reference adaptive control for drag-free satellite

Design and Analysis of the Integrated Drag-Free and Attitude Control System for TianQin Mission: A Preliminary Result

“…The norms of the eigenvalues for the drag-free loop and spacecraft attitude loop is depicted in Figure 8, with the norms of eigenvalues for the drag-free loop presented on the left, while the norms of eigenvalues for the spacecraft-attitude loop are provided on the right. As is shown in Figure 8, we calculated the eigenvalue of Q ς based on (45); it is obvious that the stability of the drag-free loop was guaranteed with the disturbance of parameters ∆m S and ∆λ diag 2 .…”

“…Additionally, three tracking strategies are proposed with different selection matrices: one-test-mass point, line-of-sight (LOS) point, or no-defined-drag-free-reference point. And besides this, a fault-tolerant control based on the model reference adaptive control (MRAC) method was considered in [44], an event-triggered MRAC design is proposed in the [45], and a frequency-domain-based approach is presented in [46], and the results can be applied to space missions that rely on frequency domain observations. More and more scholars have given their attention to the drag-free control design, and many kinds of new studies have been proposed, such as event-triggered adaptive terminal sliding mode tracking control and disturbance rejection control with a Kalman-filter-based extended state observer.…”

Event-Triggered Disturbance Estimation and Output Feedback Control Design for Inner-Formation Systems

“…This control method utilizes external actuation to counteract relative motion deviations between the external and internal spacecraft, thereby achieving compensation for interference from the external spacecraft. Due to its significant developmental potential, scholars have conducted extensive research on the inner-formation system [14][15][16][17][18] and drag-free spacecraft [19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”