Urban Traffic Roadside Parking System Based On Internet Of Things Research And Implementation Of Key Technologies

As the number of vehicles grows year by year,the city's traffic congestion area gradually spreads outward from the central area,and the problem of "difficult parking" is becoming increasingly serious.The roadside parking lot makes full use of the unused pavement resources of non-arterial roads and opens up pavement parking spaces.It can solve temporary parking difficulties in some urban areas at a lower cost during peak demand for parking,and avoid new off-street parking wasted parking resourcesAt present,in the implementation of roadside parking lots,there are solutions based on the Internet of Things technology at home and abroad,the core of which is to detect the sensor·nodes of the vehicle.Considering the cost and adaptability to the roadside environment,many roadside parking systems use buried geomagnetic vehicle detectors,but in practice such detectors still have many shortcomings:1.Other information that cannot identify the vehicle(such as license plates)Number,vehicle owner information,etc.),which may lead to fee evasion and arrears,and subsequent penalties cannot be added to illegal vehicles.2.In terms of communication,the geomagnetic detector needs to establish a base station next to the road.The unilateral roadside parking lot has a narrow front and rear distance.The radiated area of the base station is limited,which affects signal transmission.Furthermore,the base station needs regular maintenance,and its power supply problem also needs to be solved?This paper applies the RFID(Radio Frequency Identification)technology and NB-IoT(Narrow Band Internet of Things)technology in the Internet of Things technology to the roadside sensor nodes in view of the limitations of the sensor nodes in the roadside parking system.In RFID technology,RFID tags have unique characteristics and can be bound to vehicle information,and detection of tags can identify vehicle information;The NB-IoT technology has the support of the base station provided by the carrier(telecom,mobile,UNICOM),which realizes the direct communication between the sensor node and the cloud platform,and also guarantees the real-time wireless communication.The main research work is as follows:(1)In order to solve the collision problem of multi-label recognition in roadside parking system,an improved dynamic frame slot ALOHA tag anti-collision algorithm was proposed.Its throughput is 0.8%higher than the DFSA algorithm.An RFID circularly polarized antenna is designed In order to meet the effective identification of labels in the roadside parking environment.(2)Proposed a parking space information transmission method based on NB-IoT technology,designed a network attachment method that conforms to the NB-IoT technology of the roadside parking system,compared and analyzed the UDP protocol and CoAP protocol of NB-IoT module through AT command experiment,and concluded that the transmission rate and security of CoAP protocol in roadside parking system is better than UDP protocol(3)Completed the design and debugging of parking space sensor nodes based on NB-IoT and RFID.Hardware design includes the selection of mcu,circuit analysis of modules,PCB design of sensor nodes;the software design includes the firmware program framework and process of sensor nodes;finally,the feasibility of the designed sensor node was demonstrated through RFID tag detection experiments and tag information reporting to cloud platforms.This article focuses on using the Internet of Things technology to solve the problem of information identification and information transmission in roadside parking systems.The designed sensor nodes overcome the problems of tag collision and metal interference,and upload the information to the cloud platform in real time.It provides an application basis for further improving the roadside parking system.