The Design And Research Of Parking Guidance System Based On ZigBee

Based on the needs of the current social and economic development,this paper makes a thorough investigation and analysis of the existing parking lot development status and some problems,such as low degree of intelligence,most of the parking is guided by artificial experience;Parking space status information can not be released in time,the parking lot and users can not realize the sharing of information,leading to a large number of parking resources distributed unevenly and wasted,causing economic losses,road congestion,environmental pollution and so on;In many large parking lots,there is no prompt parking guidance,and users will wander inside because they are looking for the right parking space,causing internal traffic chaos and wasting time and money.Internet of things technology in our country is in the upsurge of development,seize this express,in this paper,a parking guidance system based on ZigBee is proposed.The main solution of this system is the deficiency and existing problems of the existing parking lots.The parking lot is a long cycle of investment capital gains,so to meet the demand,as far as possible from the economic perspective:in the short distance wireless communication,the characteristics of ZigBee technology,such as low power consumption and low cost etc,are most suitable for the transmission of parking lot information;in the car position detection technology,comparative analysis from the detection accuracy,anti-interference and price,found that the magnetoresistive sensor is more suitable for parking space detection equipment.This paper focuses on the design and calculation of parking guidance:Firstly,to analyze and design the overall framework of the system and the function of each module and process;then model and algorithm improvement of parking detection system,put forward the "triangle filter" baseline update and dynimic threshold algorithm,through the acquisition of three axis magnetic field data,and this data is converted to Boolean values,and set the threshold before for comparison,so as to further determine whether there is a car parking space.The shortest path algorithm in the parking lot,in the past,only consider the shortest distance from the entrance to the parking spaces,and the design of this paper is the sum of the shortest distance from the entrance to the parking spaces and from the parking space to the exit is taken as the shortest path calculation.In comparison to some of the most shortest path algorithm,the final choice of the Dijkstra algorithm and through specific examples of this algorithm was validated.On the basis of this,the algorithm is simulated and improved to meet the needs of the shortest path calculation in parking lot and realize path guidance.There are many factors that influence the choice of parking spaces,such as the type of the car parking space,the parking skills of the owner,the safety of parking,the parking preference of the owner etc,so the best choice to consider multiple factors,according to these factors,this paper proposes a multi-attribute decision making model based on grey correlation,and the algorithm is studied deeply.Finally,through the concrete parking lot as an example,the calculation of the shortest path and the best choice of the parking spaces through the wireless transmission network to the electronic induction screen,to achieve the purpose of intelligent parking guidance.