Design Of Wireless Parking Detecting System Based On GMR Sensor

In recent years,parking issues have brought about more and more distress for people’s transport.Solving these parking issues can reduce the pressure of transport.The wireless parking space detection system based on GMR sensor designed in this thesis can accurately and timely get the information of parking spaces and achieve convenient control of detection nodes on parking spaces.The traditional parking space detection system has the disadvantages of high cost,high power consumption,short communication distance,susceptibility to the environment interference,and inconvenient installation and maintenance.The magnetoresistive sensor,wireless communication and voice recognition technology used in this system can effectively improve the above shortcomings of the traditional parking space detection system and can be better applied in actual scenarios.Considering the actual application scenarios and requirements,the parking space detection node of the system selects the low-power,high-sensitivity bi-axial GMR sensor.The state of the vehicle in the parking space is determined by detecting the disturbance of the vehicle to the geomagnetic field and the algorithmic data processing of the disturbance information.The Ld3320 module recognizes voice commands to control the parking space detection node,and the usr-c215 gateway communicates the serial data of the coordinator with the parking space detection software through the Wi Fi network.This thesis first introduces the research background and significance of the subject,and then summarizes and analyzes several common parking space detection technologies,parking space detection algorithms,and short-range wireless communication technologies.Based on this,this thesis introduces the detection principles and characteristics of different magnetoresistive sensors in detail,and introduces the design of a wireless parking space detection system and the magnetic field data acquisition system from the overall framework flow and the functions of each part.Next,the design of the overall system hardware and software is completed.The work related to hardware mainly includes the construction of the voice recognition module and the gateway module,the model selection of the three networking node devices,the drawing of schematic diagram and PCB,and the final welding and debugging.In terms of software,the work mainly involves the construction of Zigbee wireless sensor network,the program flow design of three networking devices and voice recognizer,the detection algorithm and the implementation of parking spacedetection software.In the part of experimental test,it analyzes and compares a large number of geomagnetic disturbance data on the parking space during the parking of the vehicle,and sets the appropriate threshold parameters for the determination of the parking space state in the algorithm of the system.The actual parking test indicates that detection accuracy of this system is more than95%,which can meet the needs of actual parking applications.