A Nominal Trajectory Method Combined with PD Control in TAEM Phase

In order to enhance the precision and the flexibility of the guidance law, considering the flight characters of the reentry vehicle with large lift drag ratio during the terminal area energy management (TAEM) phase, a guidance law of planning the trajectory is given. This method is composed of two parts, the nominal control orders and the PD control orders. The nominal control orders are built realtime based on the geometrical characters of the nominal trajectory that are gained offline and by the current status of the vehicle at the same time, while the PD control orders are calculated according to the error signals between the current status and the excepted status. After simulating and verifying, the effect and the advantage of this method can be shown.