Application Of Wireless Sensing Traffic In The Internet Of Things

Since the21st century, the annual growth rate of China’s motor vehicle continue to increase, while the growth rate of transport infrastructure has lagged far behind the growth rate of the vehicle. Meanwhile, transportation promotes sustained economic growth, but the negative problems such as traffic congestion, energy shortages and traffic accidents are increasingly obvious. Especially in the large and medium-sized city, parking problem has become very serious traffic problems. Therefore, it’s our urgent need to real-time monitor the traffic flow, the vehicle types and the vehicle speed, in order to effectively guide and manage the urban parking spaces.This paper presents a wireless sensing vehicle detection system. The system is divided into two parts, namely the wireless sensing for moving vehicle and for stationary vehicle. Wireless piezoelectric sensor nodes deployed in designated areas and wireless weak magnetic sensor nodes constitute the wireless sensor subnets, which is used to collect vast amounts of vehicle information data. Wireless Mesh Network is regional backbone network. Each wireless Mesh node gathers and transfers huge amounts of wireless sensor network data. Traffic information data are uploaded to the server through the Mesh base station nodes, displayed through a friendly interface after being analyzed and processed, finally present guidelines for relevant personnel in order to provide reliable data for road planning, designing, maintaining and decision-making.The main research work of this paper includes the following four aspects:The first part describes and analyses the current situation and the development trend of the wireless sensor in the field of traffic networking. In this part, the comparative analysis of wireless sensors for moving vehicles and parking vehicles respectively are given, the sensing scheme with dynamic and static feature composed of piezoelectric thin film traffic sensors and geomagnetic sensors is determined.The second part focuses on the introduction of the hardware architecture of the entire system, including the hardware options such as the Wireless Mesh nodes and capture devices, as well as hardware design of wireless weak magnetic nodes and piezoelectric signal transmitters.The third part introduces the system software design including the collection and transmission of the traffic information data by wireless sensor nodes, the SerialForward complement of wireless Mesh nodes, and the storage, processing and display of the traffic information data.The last part gives the spot test of the wireless sensing vehicle detection system. The various system functions are verified.