Sun Zhaocong
ABSTRACT
Car virtual driving simulator has widely applications in the fields of driver training, ergonomics research and automotive product measurement. It can simulate various space gestures during the running of the vehicle, such as bumps, crashes, turns, weightlessness and others. It has features of great reproducibility and high safety performance. Most of the virtual software builds models of vehicles, roads, mountains, trees and houses as virtual scenes, where we use the simplified dynamic models to provide theoretical basis for dynamic simulation. The software use script programs to achieve collision detection, speed change, input and output response. To establish a road in the fictitious environment, the road parameters consisted of the straight road and curve should be extracted from the roads in real world. The straight road information includes the length and the slope. The curve information includes the corner and the radius. To have a better experiment result of virtual driving, a road in the real world, which meets the experimental requirements, is chosen. The coordinate points of it are extracted by geographic information systems. The Road Parameter Calculation Algorithm Based on Derivation, which converts the input of extracted coordinate point to the output of the road parameter, is proposed in this paper. In order to calculate the radius of a curve based on extracted points, the Three-Point Method is usually used. The Three-Point Method has great error due to the randomness of the selection. Researchers use differential method to obtain an average radius of the curve. The algorithm proposed in this paper is based on derivation. After deriving the trajectory twice, the curvature is calculated, which is the reciprocal of the radius. Based on this method, the road parameters of straight road and curve can be calculated from the extracted coordinated of points. The road parameters will be used to create the virtual road.
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Index Terms
- Road Parameter Calculation Algorithm Based on Derivation
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