Research On Vehicle Speed Detection Algorithm And Tag Deployment Strategy Based On RFID Systems On Roads

In modern society, the quantity of vehicles in cities is growing rapidly. As numerous drivers might be aggressive and alert where the traffic supervision is relatively weak due to the fast-paced way of life, speeding happens all the time, which results in the percentage of traffic accidents caused by speeding is extremely high. Accordingly, the safety and supervision of city traffic appear to be significant. The existing vehicle speed detection systems, such as radar or video image measurements, are limited in the specific road sections because of the cost and technical problems. Although the speed detection based on GPS is convenient for the drivers, its measurement accuracy is not satisfactory. Therefore, the measurement results based on GPS cannot be evidences for the traffic administrators. The Speed Detection System (SDS) based on RFID Systems on Roads (RSR) proposed in this research can solve the above problems. It can realize the whole road speed detection and report the related information of speeding or low speed vehicles to the drivers and road supervision departments. Meanwhile, it can broadcast the speeding or low speed warning to the other vehicles nearby via V2V or V2I in time for the sake of reducing the probability of traffic accidents. The SDS based on RSR will become an important part of Intelligent Transportation Systems (ITS) in the future. In the SDS, the RFID tag deployment has significant influence on the system performance under different speed limits. Thus, this paper researches the SDS based on RSR and proposes the tag deployment strategy. The major contributions of this research can be summarized as follows:1. By introducing the basic principles, classes and main features of RFID technology, as well as the reading range of the RFID readers, this paper demonstrates that RFID technology applies to the high speed traffic scenarios and elaborates the models and studies on the related applications of RSR. The architecture of the SDS based on RSR is built in this paper, which includes the tag information collection subsystem, the measurement and decision subsystem and the speeding or low speed vehicles around warning subsystem. The functions and realization ways of these subsystems are also elaborated.2. This paper researches the vehicle speed detection methods under different road scenarios and proposes the speed detection algorithms for both single lane and multiple lanes in the same direction. The lane changing of motor vehicles is also considered. Analyses of the performance of SDS in the simulations introduce that different tag distances have an effect on the performance of SDS.3. The computational formulas of tag distances for the purpose of vehicle speed detection are deduced in this paper by analyzing the driving behaviors and the vehicles’ acceleration and deceleration performances. The tag deployment strategy for single lane in the direction is given in detail while the tag deployment strategy for multiple lanes in the same direction is analyzed and discussed. The simulation results indicate that the proposed tag deployment strategies improve the performance of SDS effectively.