Autonomous Rendezvous of Spacecraft on Elliptical Orbit Based on Active Disturbance Rejection Control

A new control method is proposed with active disturbance rejection control for the complex control problem of autonomous rendezvous of space crafts on elliptical orbit in the absence of orbit information. Under the conditions of the elliptical orbit dynamic model, a transient process between the initial coordinate and the target coordinate of the system is designed to reduce tracking error and solve the contradiction between system rapidity and overshoot. Using extended state observer to estimate the real-time information of the unavailable time-varying parameters and external disturbances, then the estimated value is compensated by nonlinear feedback control law. Simulation experiments are implemented in the ideal condition and the external interference condition of the system respectively. The simulation results indicate that the system not only satisfies the task requirements, but also has obvious advantages of its control precision, control time and anti-interference ability.