Re-entry Tracking Control Via State-Dependent Riccati Equations.

Sate-Dependent Riccati Equation (SDRE) method is applied here to track optimal entry trajectory which can be generated online by On Board Three Dimension Trajectory Generation. In this paper, the design of a longitudinal entry tracking control law based on SDRE was proposed in detail. Since its control value and weigh metric depend on the current state which can be a good and precise compensator to disturbance. Besides, from the design procedure, SDRE method is very easy to implement whether on the mathematical deduction or the online calculation. Numerical simulation for SDRE tracking law was carried out, and compared to traditional tracking method to demonstrate the simplicity, robustness, and doable performance of SDRE controller. [ABSTRACT FROM AUTHOR]