Finite-Time Adaptive Attitude Stabilization for Spacecraft Based on Modified Power Reaching Law

摘要

In this paper, a finite-time adaptive sliding mode control scheme is proposed for the attitude stabilization of spacecrafts with lumped uncertainties. By introducing an exponential function in the reaching law design, an improved reaching law is developed such that the faster convergence of sliding mainfold can be achieved. Then, an adaptive controller is proposed based on the modified reaching law to guarantee the finite time attitude stabilization of spacecrafts by adaptive estimating the bounds of uncertainties. Besides, the chattering problem is reduced by using a power rate term in the controller design. Simulations are given to illustrate the effectiveness and superior performance of the proposed method.