A Method of Improving the Accuracy of Geomagnetic Parking Space Detector
A parking space detector and an accurate technology, applied in the field of parking space detection, can solve the problems of high cost and increase the burden of wireless communication, and achieve the effects of prolonging the service life, avoiding the error of parking space state determination or abnormal operation of the equipment, and reducing power consumption.
Active Publication Date: 2017-05-31
JIANGSU PROVINCIAL COMM PLANNING & DESIGN INST
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[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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[0053] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0054] This embodiment is a method for improving the accuracy of the geomagnetic parking space detector, which is realized on the geomagnetic parking space detector. Figure 5 It is the circuit block diagram of the geomagnetic parking space detector used in the present invention, as Figure 5 As shown, the geomagnetic detector includes a low-power microprocessor module, a battery-powered module, a wireless communication module, a reed relay reset module, a three-axis magnetoresistive sensor, a data storage module, an RTC clock module, and a battery voltage monitoring module; The low-power consumption microprocessor module is connected with the wireless communication module, the three-axis magnetoresistive sensor, the battery voltage monitoring module and the data storage module respectively through the I / O port, and the power supply module is connected with the wirel...
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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...
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IPC IPC(8): G08G1/14
CPCG08G1/042G08G1/14
Inventor周云城王维锋季锦章万剑
OwnerJIANGSU PROVINCIAL COMM PLANNING & DESIGN INST