The invention relates to a calibration method of a geomagnetic sensor and particularly relates to a self-adaptive adjustment method of a threshold value of the geomagnetic sensor. The method comprisesthe following steps of detecting a magnetic field value when no vehicle exists, and recording the magnetic field value as a no-vehicle first magnetic field value; detecting and recording a second no-vehicle magnetic field value after the vehicle leaves the parking space after the first no-vehicle magnetic field value is recorded; detecting and recording a third no-vehicle magnetic field value after the vehicle leaves the parking space after the second no-vehicle magnetic field value is recorded; detecting and recording an Nth magnetic field value of no vehicle according to the method; and calculating an average value of the recorded vehicle-free magnetic field values, selecting at least three adjacent groups of vehicle-free magnetic field values for calculation during average value calculation, and the average value being a threshold value of no vehicle in the parking space. The method is advantaged in that calibration is achieved through several times of parking, the workload of calibration is reduced, calibration is convenient, calibration is conducted all the time in the using process, the threshold value is corrected in real time, detection accuracy is guaranteed, and manual maintenance cost is reduced.
本发明涉及一种地磁传感器的标定方法,尤其是一种地磁传感器阈值的自适应调整方法,包括以下步骤:在没有车辆时检测磁场值,并记录为无车第一磁场值;在记录无车第一磁场值后车辆离开车位后检测并记录无车第二磁场值;在记录无车第二磁场值后车辆离开车位后检测并记录无车第三磁场值;依照上述方法检测并记录无车第N磁场值;将记录的无车磁场值计算平均值,所述计算平均值时选取相邻的不少于三组的无车磁场值计算,所述平均值为车位无车的阈值。该方法通过几次停车实现标定,减少了标定的工作量,标定方便,并且在使用过程中一直进行标定,实时修正阈值,保证了检测的准确率,降低了人工维护成本。
Geomagnetic sensor threshold self-adaptive adjustment method, system and terminal
一种地磁传感器阈值的自适应调整方法、系统及终端
2020-08-25
Patent
Electronic Resource
Chinese
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