Research On Vehicles Positioning Based On The Combination Algorithm Of Time Difference And Frequency Difference

As the traffic volume of expressways in China is on the rise,it is particularly important to monitor the status of various types of vehicles on the road.How to strengthen the monitoring of moving vehicles,especially the monitoring of vehicles for transporting dangerous goods,has become a prominent problem in solving road safety.Therefore,it is of great practical significance to establish a comprehensive and intelligent road traffic monitoring system.This topic comes from the actual project of Beijing Lianyu Lutong Company,the intelligent lane sensing system.The system consists of base stations along the expressway,vehicle-mounted tags and multi-functional intelligent processing platforms.The overall goal of the project is to use a dedicated ultra-wideband high-frequency short-range communication technology combined with a complex target location algorithm to realize a vehicle-integrated large-bandwidth wireless network communication and centimeter-level high-precision vehicle positioning.Based on this,build a platform for highway operation and intelligent supervision of big data.This paper is mainly responsible for the research on the algorithm of moving vehicle positioning in this project.First,the principle based on the signal arrival time difference positioning algorithm is calculated.This paper proposes a combination of Chan algorithm and Taylor algorithm to solve the time difference positioning equations and determine the number of base stations in the positioning system.Then analyze the principle of the Doppler frequency difference positioning algorithm,and simulate the positioning effect of the frequency difference algorithm in the actual application environment.The simulation obtains the distribution model of the positioning base station and the applicable vehicle type of the positioning system.Finally,this paper proposes a positioning algorithm combining time difference and frequency difference,determines the calculation method of joint positioning algorithm,and analyzes the algorithm simulation,and also obtains the best project application scenario.