Pre-separation trajectory design and control for horizontal-takeoff reusable launch vehicle

Reusable launch vehicles (RLV) are the inevitable trend to achieve fast, reliable, and inexpensive access to space in the future, and are also a current research hotspot in the aerospace field. To address the safety requirements of hypersonic multi-body separation of two-stage-to-orbit (TSTO) RLV, in this paper, a parabolic-shaped ascent trajectory for multi-body separation is designed in terms of safety, and proposes a tra-jectory profile solution method based on horizontal displacement derivative with known trajectory shape. And then the trajectory linearization control (TLC) method is combined with the solved trajectory profile for the design study of the guidance rate. Finally, the feasibility of the proposed trajectory strategy and the profile solving algorithm is analyzed and verified by simulation in MATLAB, and the tracking control effect of the parabolic separation trajectory designed in this paper is tested.