Research And Development On Visual System Of Flight Simulation

With the development of computer simulation technology, simulation technology has been more and more widely applied to the weapon system design such as missile system. But the missile system simulation will generate a great number of data as simulation result, engineer should take much time to analyze the data, and the analysis is boring. According to simulation purpose, build up the 3D model of simulation objects, and take advantage of computer graphics technology, scene simulation can create a vivid virtual scene, objectively express the simulation process in image style. Scene simulation provides flight simulation an efficient analysis means.Considering the current domestic urgent requirement on visual system in flight simulation, use advanced technology of development of visual system, a flight scene simulation system on a certain type air-to-ground missile is developed. The following aspects are mainly studied in this paper.Firstly, some objects of scene simulation were discussed, include how to develop a scene simulation system, elements that build up a scene simulation system, graphics pipeline of scene simulation, and multi-process render style. Some methods that used to display virtual scene in real time are studied as well.Secondly, 3D terrain processing is studied, include the data source of terrains, digital elevation model, and surface process of digital elevation model. Large terrain in scene simulation is also discussed, include two methods that used to display large terrain in real time and LADBM (Large Area Data Base Manage) module in Vega.According to the purpose of the flight simulation, adopting the object-oriented (OO) technology, a simulation model for a certain type air-to-ground missile trajectory simulation is set up. The model makes up with some modules, such as dynamics subsystem and control subsystem. In this paper these modules are discussed in detail. Data structure and simulation algorithms and data interface to scene simulation are also discussed. Use distributed simulation methodology, missile trajectory simulation and scene simulation make up a relatively complete flight simulation system through SBS real-time network as intermedium.At the end of this paper, scene simulation software design is discussed, include design idea and the detail design process according to the design idea. A scenesimulation software whose scene can be customized is developed. The scene simulation program get data from trajectory simulation program and objectively express the full process of the trajectory simulation.In engineering practice, the flight simulation system made up with missile trajectory simulation and scene simulation through SBS real-time network mentioned in this paper has some value.