Method for improving accuracy of geomagnetic parking stall detector

Abstract

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.

Description

technical field [0001] The invention relates to a geomagnetic parking space detection method, in particular to a method for improving the accuracy of a geomagnetic parking space detector, and belongs to the field of parking space detection. Background technique [0002] The use of geomagnetic sensors for parking space detection combined with wireless communication technology for networking is an emerging parking space detection scheme in recent years. Compared with traditional geomagnetic induction coils, ultrasonic parking space detectors, video parking space detectors, etc., wireless geomagnetic parking space detection The detector is easy to install without wiring, and has obvious advantages in terms of construction cost and detection accuracy. It has become a very important vehicle detection device and is more and more popular among parking equipment suppliers and parking lots. [0003] The detection principle of the existing wireless geomagnetic detector is to judge whe...

AI Technical Summary

Problems solved by technology

[0007] Invention CN102930741 A high-precision parking space detection system and its detection method proposes to use the comprehensive information of at least two wireless geomagnetic parking space detectors to judge the state of the parking space, thereby improving the accuracy of parking space detection; this invention needs to install two parking spaces on each parking space detector to improve the determination accuracy, the cost is high and the burden of wireless communication is increased

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