Design Of Vehicle Traffic Detection System Based On Low Power LAN

The problem of urban traffic congestion has recently become a major factor restricting urban development and increasing people’s working hours.If you can accurately detect ground traffic flow,and accurately analyze and predict traffic flow in the area.Then it can effectively guide the traffic flow through traffic signs,etc.,greatly alleviating the congestion of key roads.This topic designed a traffic flow detection system based on low power LAN.It uses a magnetoresistive sensor to detect road cars.It uses NB-IoT-based low-power wireless transmission technology to achieve information transmission.It uses data mining technology to analyze and process big data,and predicts future traffic flow based on the detection results of real-time traffic.Based on the analysis of the status quo of domestic and international traffic flow forecasting research.It compares and analyzes various technologies currently used for traffic flow detection.It focuses on typical low-power communication technologies such as NB-IoT,EMTC,LORA,Telenas,and PTC.It selects NB-IoT technology as the wireless transparent communication method according to the actual application of the system.It compares and analyzes several traffic flow detection technologies such as radar(microwave),laser,video and ring induction coil,and determines the AMR magnetoresistive detection technology as the actual detection technology of this system.Secondly,it discusses the overall structural design of the traffic flow detection system based on low-power LAN.It adopts the Internet of Things technology architecture,and divides the system into three units: the sensing layer,the transport layer and the application layer,and mainly designs for the sensing layer.It analyzes the vehicle flow detection hardware unit and discusses in detail the functions of each unit module.And according to the characteristics of the system running at low power.It selects the MSP430 microcontroller with ultra-low power operation as the core controller.The paper focuses on the detailed design of the vehicle flow detection hardware unit.It analyzes the circuit design of the control section.It studied the design of the NB-IoT communication unit.Based on the comparison and analysis of different NB-IoT modules.It determines the choice of the BC95 module as the communication unit of the system.It discusses the design of the magnetoresistive sensor circuit,compares the performance of different magnetoresistive sensors,selects the HMC1052 sensor,and designs a detailed sensor part circuit.At the end of the paper,the embedded software design and system test of the traffic flow detection unit were completed.The software program structure and main program flow of the vehicle flow detection system are designed.It focuses on the design of serial communication subroutines.The traffic flow detection system is tested with the support of the system software.It discusses in detail the functional test of the traffic flow detection system and the overall functional test of the traffic flow detection system.Through the test of each functional unit of the system and the overall operation test of the system,the functions of each unit of the system are realized,and the long-running system has stable stability and can meet the use requirements.