Research On Scene Simulation In AHS Simulators

Automated Highway System (AHS) is recently regarded as one subsystem of Intelligent Transport System (ITS). The research of AHS is developed actively in some country, such as Japan and United States. There are many experiments in the research of AHS, so more people should take part in it and more money and time is consumed. But these experiments don't get good results quickly, and some other factors bring about certain difficulties and bad influences. So it is very exigent to perform research on AHS simulation. And AHS simulator is one of effective ways of this research. If the experiments were developed after they had been done in the simulators, there would be advantageous to reduce labor, money and time. And it will take on the process and results of experiments in an intuitionistic and vivid display. The scene system of the AHS simulator was selected as my research in the dissertation.The development of driving simulators, scene simulation and automated highway system at home and aboard is introduced in the dissertation. The significance of AHS simulators is expatiated. The foundation and optimizing technology of scene simulation in real-time simulation system is analysized. Creator, 3D-modeling software and Vega, real-time simulation software are used as the developing tool of real-time simulation. The functions of these softwares and key technology are analyzed. The upbuilding process of 3D models is realized based on Creator and the real-time simulation is developed based on Vega. Theory of modeling based on particles system is analyzed and used to simulate natural phenomena such as rain and snow. The method of intersection tests and the concept of "Transparent Wall" are introduced in detail, which is used in perform intersection tests between a player and static object such as parterres or guard boards on roads. The simulation of getting the front and back offsets and driving angel between the selected vehicle and the line composed ofmagnetic markers. A roaming system of virtual simulation has been developed based on above-mentioned models and modeling technologies.The arithmetic method of intersection tests in an AHS simulation system based on magnetic-marker navigation, using the way named by "transparent walls". And this method is put into use in the virtual scene system now.Through the above-mentioned research, the work done are listed as follows:(1) Two virtual scene models are built up, an urban transport scene and a virtual trailing ground. There are roads, traffic signs, signal lamps, vehicles and pedestrians, building and so on in the urban transport scene.(2) The signal lamps' phase changing, vehicles' running, and pedestrians' walking are realized. And some natural phenomena such as fog, snow and rain are simulated.(3) The intersection tests of dynamic objects and static ones in the scene such as the bump between a car and the parterre on the roadside are developed, and the clues is given on the screen. And testing a vehicle's position related to the line of magnetic marks in the virtual trailing ground is simulated in favor of successive control models.(4) A simple roaming system is developed to realize cruising the 3D virtual scenes.