Research On Key Techniques Of Three-Dimensional Simulation In Mars Exploration

Mars exploration is not only the hot topic of deep space exploration in the 21st century, but also the master object of deep space exploration. By using 3D simulation technique for Mars exploration visual demo, we can validate the mission planning and whole process of Mars exploration more effectively and has theoretical and using values. With the supports of 863 program, this dissertation focuses on analysis of the key technologies in 3D simulation of Mars exploration based on algorithms of computer graphics, knowledge of orbit dynamics and the theories of space technology. The main research achievements of this paper are given as follows:1.The mathematical mode of 3D simulation for Mars exploration are Established, including: Study on spatio-temporal coordinate system transformation of Mars probe's orbital motion modeling based on the defining of spatio-temporal coordinate system and knowledge of orbital dynamics. According to the geometric relationship of ground stations, probe and spatial entities, the calculation method of TTC (Tracking Telemetering and Command) simulation, such as ground track, elevation of ground stations and communication link are realized. A drawing method of tail fare and flight track based on two-level particle system is proposed in this paper and this new method can effectively improved the real-time and fidelity capability. The airbag landing mathematic and mechanical model is established by using the approximal way, and the simulation process is developed.2.Study on 3D Modeling and Rendering of data in Mars exploration virtual space environment. The 3D modeling of planet is carried out by use of algorithm for view-dependent global LOD. A efficient method to achieve the 3D modeling for spaceflight launch site and landing site is presented base on solid-modeling of level of detail. Then, the Integrated Modeling of multi-scale spatial data is carried out by using the two method. The spatio-temporal data model of Mars probe is developed by using the GBML method , and then the problem of the parameter description of model's geometry and behavior is settled. A general method of atmospheric effect rendering is designed to render the Mars'atmosphere. This method predigests dispersion equation and avoids complicate physics computation.3.A deep Space Environment 3D Engine—DSE-3D is designed and implemented. After introducing the workflow of GPU rendering pipeline, a hardware accelerated render module base on vertex and fragment shader using OpenGL shading language is set up. The quaternion rotation technology which is applied to scene roaming overcomes the limitation of Euler angles, achieve a better cruising effect. The engine's script class and description based on object-oriented are designed and script control technology implemented.4.A demo platform that achieves the 3D simulation demo of Mars exploration is established. The constitution of hardware and software in 3D simulation demo of Mars exploration platform is introduced, its working principle and functions are also analyzed. This platform is used for visualization algorithm verification, many experiments applications are given.