Research On VANET (Vehicular Ad Hoc Networks) For Vehicle Lane Change

Almost all of the advanced vehicle active safety is added on the car itself to load a large number of sensors through the vehicle monitoring and the safety state of other objects.Meanwhile,under the unsafe condition,the corresponding measures to avoid the situation mentioned above is needed to be implemented.In this case,driving car under the security state can be guaranteed,but this traditional security pattern still has its limitation.For instance,only its monitoring system can be used to detect the behavior of the other objects.What’s more,this model is unidirectional which not only enlarge the difficulties to car design with high price but also not available to satisfy people’s pursuit for the safe driving concept design.On the other hand,it is the main direction for the development of the active safety technology of automobile when the Internet of vehicles can be added into traditional security pattern that builds up the bidirectional and multidirectional safety assurance.This thesis introduces the concept of the technology of the Internet of vehicles and its current situation at home and abroad at first.In the meantime,this thesis also puts forward the research and direction by summarizing the challenges and opportunities.With the introduction of lane change scene,the research on VANET is carried out.The main research contents are as follows:(1)This thesis mentions that the base Matlab/Simulink simulation platform completes the building of the system model on the basis of the architecture of the warning system to vehicle lane change in the internet-based technology.The lateral controller and the longitudinal controller are also designed.This thesis introduces the longitudinal controller-fuzzy PID controller,including fuzzy basic theory,fuzzy rules and specific control methods.Meanwhile,this thesis also expounds the lateral controller-the MPC(model prediction)controller,including the basic principle of MPC and other related content.In this case,the results show that the system can effectively avoid the traffic accident caused by a sudden and lane changing which can effectively increase the active safety of vehicles.(2)A brief introduction to VANET,including two aspects of the research: wireless communication and vehicle movement.The brief description of the coupling method of the two parts is also included.Besides,the vehicular ad-hoc network simulation experiment is implemented on some selected urban traffic trunk road,and the results like the typical traffic scene on the time delay,shaking and throughput were analyzed as well.So,the influence of the speed to the conclusion of network performance can be obtained.(3)Based on the Internet simulation platform and on the basis of a large number of simulation experiments,the performance effects of speed,Doppler frequency shift to vehicle ad-hoc network DSDV,DSR and AODV in Ad Hoc network three kinds of routing protocols has been compared and analyzed according to the vehicle longitudinal and lateral and the largest mobile vehicle speed change.(4)Taking the ZigBee wireless network communication technology as the tool,this thesis puts forward the system architecture of lane change warning vehicle road and designs the vehicle unit and the hardware and software structure of the vehicle road coordination system.In this case,the short distance coordination communication can be primarily realized,and the ZigBee communication ability test can be accomplished.The research results show that the longitudinal communication effect of the vehicle is stable in a certain speed range.In this case,it offers the theoretical guarantee to the longitudinal development of new car active safety system based on vehicle networking.Meanwhile,as one of the most important control system of intelligent vehicle longitudinal control system,it will also have great importance on solving traffic congestion and reducing the number of serious safety accidents.