Research On The Key Techniques Of Distributed VR Artillery Trainning Systems

In recent ten years, Research on technologies of modeling and simulation is very popular, The virtual reality (VR) technique, as an important direction of modern simulation technique, is playing a key role and used widely in the fields such as construction, military and etc. In this paper, some key problems about military simulation, especially artillery VR training system, are discussed for artillery training.The architecture of simulation systems is the main frame of the system, is a key part that affectting the system's extension, standard, independence of modules. It is discussed about the compose and the characteristics of architecture of systems, mainly of Distribution structure (DIS) and High Level Architecture (HLA) in this paper, some viewpoints of setting up for these two kind of simulation systems also are put forward. At last, from an actual system, a process about the application of HLA in developing a system is given.The new concept weapon expected to show in advance and calculation is an important content of military simulation. In this paper, it is studied about the trajectory imitation of the laser end-guided shell and the gunning efficiency of the cluster bomb assessed. The whole ballistic model of end-guided shell has been set up and the district of effect also has been calculated. It is also discussed about accidental error of a round about shrapnel. And models evaluating damage efficiency have been set or improved, including data calculus model, statistics test model, be common cannonball model and two group of error model. Three systems, the virtual reality training system for artilitary firing command, the training simulation system of end-guided shell and the training system of shrapnel firing have been developed in the field of artilitary firstly. In them some important problems have been resolved such as realization of the total structure, distance measurement simulator design, the large view terrace to put together, show and management of 3DE, the collision detect and response etc. All these can be the foundation of research of military training systems.As terrain model built, the model quantity and showing speed is a couple of contradiction. For this, this paper offers some way about the geography data preparation and the data management. Some popular modeling tools are compared, and some problem, such as how to build terrain, how to make and display texture, are resolved. At last the algorithms of simplifying terrain models are studied.In this paper, A DS (Dynamic Sorted) algorithms are put forward towards the speed of collision detection and the quantity problems of terrain showing in a large virtual environment. These algorithms takes the technology of box as foundation, according to the characteristics of a large virtual view, putting forward the standpoint of part, active, close together of the collision occurrence, gives and proves three items about collision detection, decreases deeply the area of detection after setting up three sorted list in three axes, and improves the efficiency of collision detection.In virtual environment, collision detection is the first problem to improve the reality of systems, collision response is the key element for view effects. This paper according to the characteristics of virtual battlefield, first carries on the research to the collision, immediately thoroughly analyzes several kinds of collision of the virtual battlefield: such as the collision of missile for target or the earth, the collision of target and terrain ,the collision of between the view and other objects, and etc. after building up a set of scientific and useful simulation models , provides the theoretical basis for resolving the collision problem in military simulation.In the end, this paper makes the further outlook of VR development direction and application in military trainning.