GNSS Vulnerability Assessment And Traceability Research On Transporttation

Global navigation satellite system(GNSS)is a radio navigation system composed by artificial satellite constellation,ground control station and users receiving device.Compared with traditional navigation technology,GNSS has the advantages of high precision,coverage around the world,uninterrupted work and less affected by bad weather;which makes it more useful in providing real-time positioning,navigation and timing functions for people.But the openness of GNSS signal leads to its inherent vulnerability,so GNSS signal is easily jammed by barrage and deception.Thus the research on GNSS vulnerability and related areas has become a hotspot on domestic and international GNSS research.By far,the researches on GNSS Vulnerability Problems mainly focuses on qualitative aspects.At the same time,the research achievements are mostly about special navigation environment,and rare research of GNSS Vulnerability in the field of transportation applied area.Based on the project “traffic active safety oriented urban vehicles online location service technology” in the National High-tech R&D Program(863 Program),research quantitative assessment and traceability in the field of transportation applied area.Propose new GNSS vulnerability assessment and traceability methods.Analyze GNSS vulnerability with data from experiment to the roads.Verify availability and validity about GNSS vulnerability assessment and traceability methods.The primary research contributions and achievement of this paper are presented as follows:Based on different scenes about urban roadways,propose a set of top-down GNSS vulnerability assessment method.Defined three metrics from the user segment,reflect vulnerability threat level by three fields,signal quality,measuring accuracy and geometric layout.Fuse them by D-S theory,acquire a quantitative assessment result.Collect and analyze data about many urban roadways in different scenes during the experiment out to the roads.Then set up a comprehensive sample library for it.Propose a set of down-top GNSS vulnerability traceability method.Add the forth metric.Do the traceability research on different vulnerability scenes by KNN algorithm,HKNN algorithm and HKNN's generalized algorithm in data classification algorithm.