| All the map-matching algorithm, two data entry are: the original location information and digital maps. In efforts to improve the accuracy of the two data sources premise, together with the efficient matching algorithm is to improve the accuracy of map matching key, and then meet the vehicle navigation system in all fields.The main contents of this thesis include the research stage and its main vehicle navigation system map matching algorithm to analyze the characteristics of the algorithm, according to GPS positioning system error and error characteristics of digital maps, design a higher accuracy and low computational Real-time traffic map matching algorithm, and after the correction of digital maps.This thesis research and technological innovation is:(1). Entering the intersection region, the joint decision by the three weights match the road, were distance, toward the front to the similarity with the road and around the data points and the connection to all road junctions in the current changes in the angle between vectors trend, especially in the last weight, turning the vehicle speed falls below a certain value leading to the front of the unreliable roads can greatly improve the accuracy of matching.(2). Vehicle when turning once after intersection, then follow-up GPS data points to the path of projection parallelogram projection. First fitting a series of data points before and after turning, get two lines, find the intersection, then the intersection of the trajectory turning point, through the path turning point and the digital map of the turning points of the deviation, to determine the current point on the road projection, lower road along the direction of the matching error.(3). After a turning point for each map-matching process by the track record of turning point, after the correction as a basis for the map data. By many sports car track can be recorded in the navigation path while turning point for improving the accuracy of digital map provides a new way.
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