Research On Parking Space Vehicle Detection Method Based On Geomagnetic Sensor And UWB Technology

In recent years,with the sustained and rapid development of China’s economy,people’s living standards have been improving year by year.Private cars have become an indispensable part of people’s daily life as an economic and convenient means of travel.However,as the number of private cars grows year by year,the subsequent problem of "difficult parking" has become a worldwide problem.To solve this problem,a variety of geomagnetic sensing technologies and wireless communication technologies have been developed at home and abroad for intelligent parking management systems.However,vehicle detection by a single geomagnetic sensor is susceptible to interference from vehicles in adjacent parking spaces.Especially when the vehicle is parked irregularly or the vehicle chassis is high,false alarms and missed alarms may occur when vehicle detection is performed by a single geomagnetic sensor.Therefore,in order to improve the accuracy of vehicle detection and save the time for owners to find free parking spaces,a new method for improving the accuracy of vehicle detection needs to be developed.In order to solve the above problems,this article first analyzes the existing vehicle detection methods at home and abroad,integrates various factors,and summarizes the shortcomings of current common vehicle detection methods.Through analysis and comparison,this thesis finally chooses the geomagnetic sensor as the vehicle detection method.This thesis first improves the traditional threshold judgment method,and adopts the double window detection method to improve the vehicle detection accuracy.Furthermore,in order to solve the interference of vehicles in adjacent parking spaces to their own parking spaces,this topic uses a method of fusion of UWB ranging technology and geomagnetic signal detection.When a vehicle enters the parking space,the geomagnetic sensor detection is performed first.If the current parking status cannot be determined through the geomagnetic sensor detection,the UWB ranging function will be awakened,and the current parking status is comprehensively analyzed through the UWB ranging result and the change in the geomagnetic signal strength.This article mainly takes the outdoor parking space status information as the research object,combines geomagnetic detection data and UWB ranging results to specifically divide parking spaces into 6 states,and finally uses the data analysis method to finally obtain the parking space status information.The interference of vehicles entering and exiting from adjacent parking spaces on the parking space is reduced,and the false alarm and missed alarm probability caused by different models with different magnetic contents can also be reduced.Finally,it can effectively improve the accuracy of parking space vehicle detection.In order to save the time for owners to find empty parking spaces and improve the efficiency of smart parking systems.This subject intends to combine real-time parking lot data with the Internet.The parking space status can be transmitted to the parking space manager and vehicle drivers in real time through the network.Vehicle drivers can quickly find nearby empty parking spaces through the mobile client,which can effectively improve User experience and parking efficiency.By analyzing and comparing the method proposed in this paper with the detection method of single geomagnetic vehicle,it can be seen that the method proposed in this paper can improve the accuracy by about 6%.Therefore,this research has certain advanced and innovative.