Gradation Map-matching Algorithm in Vehicle Integrated Navigation System

Firstly,this paper constructs the model of entitypartners of road network in digital map.Then,the feature of positioning error of GPS/DR integrated navigation is discussed.Based on the thought of partial linearization and the relativity between positioning traces and road networks,the gradation MapMatching calculation was realized and it removes the biased error of GPS/DR positioning information.In the end,the algorithm is tested under AutoCAD.The results show that the algorithm stated here is easy to realize and can not only improve the positioning performance of Vehicle Navigation System,but also provide a visual navigation effect.