The invention relates to a geomagnetic calibration method based on wireless signal intensity. The method comprises the following steps of S10, recording a no-vehicle magnetic field initial value detected by a geomagnetic sensor and a no-vehicle wireless signal initial value of a wireless communication module when no vehicle exists in a parking space; S20, sequentially recording a vehicle magneticfield value, a vehicle wireless signal value, a vehicle-free magnetic field value and a vehicle-free wireless signal value when the vehicle enters the parking space and leaves the parking space; S30,calculating a vehicle magnetic field average value, a vehicle wireless signal average value and a vehicle-free magnetic field average value after the recorded vehicle is driven in and out for not lessthan three times; and S40, if the difference between the vehicle magnetic field average value and the vehicle-free magnetic field initial value is greater than a magnetic field judgment threshold value and the difference between the vehicle wireless signal average value and the vehicle-free signal initial value is greater than a signal judgment threshold value, setting the vehicle-free magnetic field average value as a new vehicle-free threshold value, otherwise, repeating the steps S10 to S30. The method is advantaged in that calibration can be completed only through several parking behaviors, calibration is simple, detection accuracy is high, and maintenance cost is low.
本发明涉及一种基于无线信号强度的地磁标定方法,包括以下步骤:S10、记录车位无车时的地磁传感器检测的无车磁场初始值和无线通信模块的无车无线信号初始值;S20、依次记录车辆进入车位和离开车位时的有车磁场值、有车无线信号值、无车磁场值和无车无线信号值;S30、记录的车辆驶入和驶出均不少于三次后计算有车磁场平均值、有车无线信号平均值和无车磁场平均值;S40、若有车磁场平均值与无车磁场初始值相差大于磁场判断阈值,且有车无线信号平均值与无车信号初始值相差大于信号判断阈值时将无车磁场平均值设为新的无车阈值,否则重复上述步骤S10至S30。该方法仅需通过几次停车行为即可完成标定、标定简单、检测的准确率高,维护成本低。
Geomagnetic calibration method and system based on wireless signal intensity
一种基于无线信号强度的地磁标定方法及系统
2020-08-25
Patent
Electronic Resource
Chinese
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