Reentry Trajectory Optimization And Guidance Control For Spacecraft

Spacecraft are studied in this paper from the original orbit arrive at the ground, as the spacecraft from the original orbital maneuver, the optimal return to the orbit design and the problem of spacecraft reentry trace circle eventually made a series of research work.The reentry trajectory design of the space vehicle mainly includes two stages: de-orbit and reentry. It can provide the overall design relevant parameters such as thermal, structural, control system,power system design, Inertial navigation system,and also can offer the orbital parameters for the measurement and control system on the ground and recover system.This paper optimizes the scheme of de-orbit and transition flight for a spacecraft. The optimized flight scheme can accurately arrive at the reentry point and satisfy the interface conditions of the required reentry flight status in the first phase. The optimization method for this scheme is Gauss pseudo spectral, which includes following details: select the engine de-orbit moment and a small thrust vector control for eliminating the random error influences of thrust engine during the first phase.The designed optimization scheme can control the actual trajectory to satisfy all necessary technological requirements of spacecraft in real random flight environment, and the engine consumed the minimum fuel mass. The optimization scheme of different reentry trajectory is analyzed under the condition of the second phase of the reentry of the spacecraft, the speed of 10.8km/s reentry, and the constraint conditions of the spacecraft and the overall characteristics of the spacecraft.The end of the spacecraft is the embodiment of the maximum range of the spacecraft, and the footprint under the initial conditions of different reentry and the reentry of the random wind field can be used to predict the landing range of the spacecraft. There are various errors in the process of the spacecraft reentry flight in real environment. Through the design of appropriate guidance and control scheme, the spacecraft reentry landing at the designated location. The trajectory optimization design is necessary for manned spaceflight to ensure the safety of spaceman, and it's also important to control the economic costs of space mission. The research work of this paper may provide theoretical basis for spacecraft entry safely.