Optimal Orbit Design Of Returning From Moon

With the development of aerospace science and technology, the exploration to moon is carried frequently and in deep, and the lunar exploration program of our country has been implementing smoothly and orderly. Returning from the moon is a key technology for the moon exploration, and how to reduce the fuel consumption in the process has become the crucial problem must be resolved in China's lunar exploration third stage program.Firstly,this article discusses the orbit of the section of the lunar surface back to power up. Face the problem of fuel consumption, considering influence factor of rotation of moon and geostrophic force, precise three dimensional dynamics for lunar probe returning from the moon were presented. To realize the minimal fuel strategy , an optimal control law of the thrust direction was proposed based on the maximum principle. Solving it concerning both velocity and position restrictions, the optimal orbit of returning from the moon was obtained. The research result is valuable to engineering application.The article also analyze the nature of transfer orbit from moon to earth. Firstly, use the concept of the impacting ball of the moon, in the 3D space, analyze the property of transfer orbit. Through computer simulation, we obtained some of the main parameters correlation curve, finally, Secondly, propose a fast search algorithm for moon-earth transfer orbit; Finally, through the analysis of the effectiveness of each main disturbing force, design the moon-earth transfer orbit with the precisely dynamical model.