Research On Simulation System Of Carrier And Spacecraft Flight Based On OSG

In deep space exploration and research and development of new aerospace technology,real time reappearance of carrier,spacecraft,and their operation process and flight condition using simulation technology can provide an intuitive and effective analysis method for the research of space science and technology.In this paper,the system foundation background including high definition digital earth,sun,moon and starry sky is established using OSG(OpenSceneGraph).After determining the basic condition for the unification of space and time,a simulation system of carrier and spacecraft flight is designed,setting the function of launch and separation of carrier,in orbit flight of spacecraft,high and low orbit transition of spacecraft in it.The main work of the paper is as follows:1.Construction of high definition digital earth and realization of unification of time and space.Geographic information system is the core of high definition digital earth,so a geographic information system is built through management and scheduling of massive images and elevation data firstly.Then data is divided by image segmentation and terrain segmentation technology,and a pyramid model is established to manage massive geographic data using Gaussian pyramid algorithm,which are to improve the efficiency of data processing and earth rendering.Finally,a high resolution simulation of the earth is completed in conjunction with the Earth's basic model,and high definition digital earth and starry sky background are associated with time to ensure the unification of time and space.2.Creating a physical model to simulate the tail flame of carrier.The physical model is established according to the characteristics of the tail flame of the carrier.After constructing N-S equation,the equation is solved using finite difference method.At the same time,the particle system and the physical model are combined to achieve the dynamic simulation of the tail flame so as to improve the realistic effect and immersion of the scene.3.Design and implementation of simulation system of carrier and spacecraft flight.The system is designed in a modular way according to the overall design scheme of the simulation system,and the launch process of time driven carrier is realized.The spacecraft is driven in orbit flight using real data based on path animation.High and low orbit transition of spacecraft is driven by calculated data.And spacecraft trajectories,sub-satellite point trajectories,and the correlation effects of spacecraft-to-ground station is drawn using geometry classes of OSG.The simulation results show that the system has good reliability and high operational efficiency and can accurately simulate the space missions such as launch process of carrier,spacecraft in orbit flight and high and low orbit transition and so on.In addition,the system designed can reproduce the flight process of the carrier and spacecraft,which provides a basis for improving the stability of space launch missions.