Research On Methods Of Flight Trajectory Control Of Near Space Hypersonic Vehicle

Near Space Hypersonic Vehicle( NSHV) can fly in the near space that is situated between general aviation aircraft flight space and the spacecraft orbital space.NSHV flies quickly. It has a strong motor ability. And it is difficult to be tracking.Because NSHV has these advantages, many countries start to study it. In order to accurately track NSHV, it is very important to know the flight path of NSHV.Most of the proposed model and the control strategy established by the existing literatures focus only longitudinal dynamics NSHV, while ignoring its lateral dynamics, nor consider the effect of the curvature of the Earth and the Earth's rotation.thesis is focused on the NSHV aspect, and studying the flight path of NSHV. The following main studies:First, under the influence of the curvature of the Earth and the Earth rotation,based on the mathematical model and experimental data in the previous 'Waverider'X-51 A flight test in America, thesis builds several flight trajectory models for X-51 A target. And the models include engine thrust for flight vehicle trajectory model, air model, gas dynamics model, dynamics model and kinematics model.Second, Three applicable forms of trajectory model can be concluded from the simulation results, including constant steady-state cruise, non-periodic ski-jump and periodic leaps. thesis analyses the three forms and makes comparisons where relevant.And take the periodic leaps as the example, thesis detailed analysis the influence of longitudinal maneuvering, maneuvering, the curvature of the Earth, the Earth rotation effects on the flight path of NSHVFinally, thesis use Singer model, the current statistical model(CS model)and3DVT model three model tracking algorithms to track the NSHV periodic leaps flight path. And thesis analyses the difference between the three models. The results show that the tracking effect of 3DVT model is better than the other two tracking models,and the tracking error of Singer model is less than that of CS model.