Abstract: iming at one category of reusable launch vehicle, the guidance problem is investigated for terminal area energy management phase. For a terminal area energy management system, the energy-range-to-go profile is used to guide the vehicle onto the approach and landing interface, and to control the energy dissipation. The height control coefficients in the longitudinal direction and the track control coefficients in the lateral direction are generated based on the linearization method and back-stepping control. The designed parameters are simplified and the constant PD control coefficients are given. On the basis of the off-line programming of the nominal trajectory, the requirements of the approach and landing interface are satisfied via the longitudinal/lateral integration-guidance. The guidance method is proved to be robust against the disturbances and a series of different errors.

Key words: reusable launch vehicle, terminal area energy management；nominal trajectory guidance