The invention discloses a method for improving accuracy of a geomagnetic parking stall detector. The method includes: by collecting sample data of a background magnetic field, calculating and recording benchmark data of the background magnetic field as reference standards; respectively determining calculated weight values in three axial directions according to stability of the sample data, collected by a triaxial magnetoresistive sensor, of the background magnetic field in three axial directions; turning off a wireless communication module when reading data of the triaxial magnetoresistive sensor, and storing the data into a buffer queue; calculating magnetic field changes for the data in the buffer queue, performing median filtering, and performing parking stall state determination according to changes of the magnetic field data; calibrating the benchmark data of the background magnetic field under the condition of free parking stalls; uploading the parking stall information and battery level information through the wireless communication module prior to entering the sleep state; waking through an RTC (real-time clock) in a timed manner, continuing executing from the step 3, and so on. Compared with the prior art, the method has the advantages that influence caused by temperature drift compensation and time drift of the sensor on parking stall determination accuracy can be restrained effectively, and the method is higher in adaptability, lower in cost and the like.
Method for improving accuracy of geomagnetic parking stall detector
2015-07-22
Patent
Electronic Resource
English
IPC: | G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS |
Geomagnetic parking space detector and geomagnetic parking space detection method
European Patent Office | 2015
|European Patent Office | 2015
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