Design And Realization Of Spoofing Monitoring Software For Satellite-Based Train Positioning

With the rapid development of railway in China,location service plays an important role in supporting the operation of the railway system.The train control system based on Global Navigation Satellite System(GNSS)is attracting more attention in future railway systems.Current research on satellite-based train positioning mainly focuses on the assurance of accuracy and reliability of satellite positioning and the multi-sensor integrated positioning.The monitoring and protection against the spoofing interference to the GNSS signals have not been concerned for the complex railway operation environments.Therefore,the spoofing recognition is of great necessity to guarantee the dependability and ensure the safe operation of the trains.In this thesis,the types,characteristics and implementation principles of GNSS spoofing are analyzed.Based on the characteristics of train operation,a spoofing monitoring and identification method is proposed,and a spoofing monitoring software is designed for satellite-based train positioning,which provides an effective way to accurately identify risks due to GNSS spoofing and enable the reliable and safe train positioning.The main research work completed in this thesis includes:(1)The application requirements of spoofing monitoring software for satellite-based train positioning are analyzed.Through the design of the overall architecture and structure of the software,the functional module design scheme of the software is presented.(2)Based on the practical characteristics of the train’s running along the track,the spoofing monitoring and identification method for satellite-based train positioning is studied.With the assistance from the track map information and wheel speed sensor,a cascade spoofing monitoring and identification method is proposed covering the decision domain,location domain and observation domain.(3)A specific spoofing monitoring software for satellite-based train positioning is developed,which realizes multi-parameter data loading,train operation status monitoring,satellite signal status monitoring,GNSS spoofing identification,interference statistical analysis and interference event replaying.(4)A GNSS spoofing experiment and test platform for satellite-based train positioning is established.With static and dynamic spoofing simulation and test scenarios,the spoofing monitoring and identification performance of the software under specific scenarios is validated.In this thesis,the potential risks of spoofing attacks to train positioning under the complex railway operation environments are highly concerned.An enhanced multiparameter-based spoofing monitoring scheme is proposed covering three levels in the GNSS-based train positioning,including the decision domain,location domain and observation domain.With the development of specific spoofing monitoring software and the establishment of a spoofing simulation test environment,the capability of the software in actively identifying the GNSS spoofing events is demonstrated under typical spoofing attack scenarios.Results of this research provide an active perception scheme and a dedicated software tool for spoofing-affected train positioning based on GNSS,which are of great value in achieving effective interference protection capabilities for utilizing GNSS in train operation control and other railway applications.58 figures,18 tables and 46 references.