Design And Research Of Parking Intelligent Guidance System For Indoor Parking

With the rapid development of the national economy,the number of car increased year by year in China.But the number of existing parking facilities in China can not meet the increasing demand of parking space,and the construction speed of parking facilities slower than the growth of automobiles.So,a huge gap between the supply and demand of parking spaces.The problem of Parking difficulty becomes a difficult in urban traffic development.To solve the problem of parking difficulty,the key lies not only in increasing parking facilities and reducing the number of cars,but also in improving the use efficiency of existing parking facilities.According to the development status of intelligent parking guidance system at home and abroad,combined with the Internet of things technology,an intelligent parking guidance system for indoor parking lot has designed.The main research contents of this paper are as follows:(1)A kind of intelligent guidance system for indoor parking lot is constructed.The system is mainly composed of parking spot detection,wireless communication network,display module and remote control terminal,which includes server and client terminal.The parking space detection takes CC2530 as the control core and detects the parking space status through ultrasonic sensor.The wireless communication network adopts ZigBee and WiFi collaborative networking to realize the data transmission of the whole system.The display module adopts OLED screen to display parking space resource information,and provides guidance information for car owners through text and arrow.(2)Designed parking management platform and mobile phone client.The parking management platform establishes communication with the server,accesses database information,displays parking spaceresources,parking records and other information,and provides information modification functions to realize effective management of parking lot.The mobile client provides the user with the view of the remaining parking space resources,charging situation and other information,as well as the simple visual map of the parking lot,and,combined with the display information of the venue to realizes the path guidance for the user from the entrance of the parking lot to the parking space.(3)Aiming at the car owner’s choice of parking space in the process of parking,an optimal parking space selection model is established.By analyzing the main influencing factors of car owner’s selection,factors such as driving distance,walking distance and parking difficulty are selected as decision indicators.The method of combination weighting is used to assign weight to each indicator.In combination with grey entropy theory and grey correlation degree,the alternative schemes are sorted and the best scheme is allocated to users.In addition,the road network structure of the parking lot is regular.It is not necessary to traverse all nodes when solving the shortest path from the entrance to the parking space.Therefore,Dijkstra algorithm is only needed to traverse some nodes in the road network,so as to improve the efficiency of the algorithm.(4)Finally,the hardware and software functions of the system are tested to verify the feasibility and stability of the system.The test results show that the error between the measured ultrasonic value and the actual value of the system is within 3 cm,which meets the requirements of the system on the measurement accuracy.In ZigBee wireless sensor network,the communication distance between the parking space node and the router is about 25 m,which can maintain a better communication effect.The parking management platform and the mobile phone client can display the basic information of parking charges,addresses and parking space resources in real time,provide information inquiry and modification services for the management side,and provide information query and path guidance services for the users.