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Geomagnetic calibration method and system based on wireless signal intensity

A wireless signal strength, wireless signal technology, applied in the traffic control system of road vehicles, traffic control system, measurement of magnetic variables and other directions, can solve the problems of difficult vehicle moving, inconvenient actual operation, inaccurate detection, etc., to achieve low maintenance costs , high accuracy, simple calibration effect

Pending Publication Date: 2020-08-25
迈锐数据(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the earth's magnetic field is stable within a few kilometers, and the changes caused by each vehicle to the earth's magnetic field are different, so when the initialization magnetic field calibration work is carried out, it must be required that there is no vehicle parked in the installation parking space. If there is a car parked, the car needs to be moved. In addition, and the road parking space itself is a scarce public resource, it is very difficult to move the car when actually initializing the magnetic field calibration
[0003] In addition, the service life of geomagnetic vehicle detectors is generally more than 5 years. During the 5 years of use, the environment changes, the hysteresis effect of the equipment itself, and the large-scale infrastructure construction will cause the first initialization magnetic field calibration value to drift, resulting in inaccurate detection. precise
The current method to solve this inaccurate detection is to re-initialize the magnetic field calibration, but the actual operation is extremely inconvenient

Method used

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  • Geomagnetic calibration method and system based on wireless signal intensity
  • Geomagnetic calibration method and system based on wireless signal intensity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A geomagnetic calibration method based on wireless signal strength, comprising the following steps:

[0021] S10, recording the initial value of the car-free magnetic field detected by the geomagnetic sensor and the initial value of the car-free wireless signal of the wireless communication module when there is no car in the parking space;

[0022] S20, sequentially recording the magnetic field value with the vehicle, the wireless signal value with the vehicle, the magnetic field value without the vehicle and the wireless signal value without the vehicle when the vehicle enters the parking space and leaves the parking space;

[0023] S30. Calculate the average value of the magnetic field with the vehicle, the average value of the wireless signal with the vehicle, and the average magnetic field without the vehicle after recording the magnetic field value with the vehicle, the wireless signal value with the vehicle, the magnetic field value without the vehicle and the wire...

Embodiment 2

[0032] Between steps S20 and S30, it also includes that if the car-free magnetic field value is equal to the car-free magnetic field initial value and the car-free wireless signal value is equal to the car-free wireless signal initial value, then enter S30, otherwise return to S20; the recorded in the step S30 Calculate the average value of the magnetic field with the car, the wireless signal with the car, the magnetic field without the car and the wireless signal without the car for no less than three consecutive times.

[0033] The magnetic field judgment threshold is 20-50, and the signal judgment threshold is 5-20. In the following, the specific steps will be described when the magnetic field judgment threshold is 35, the signal judgment threshold is 10, and the results of continuous detection reach five times.

[0034] Such as figure 1 As shown, a geomagnetic calibration method based on wireless signal strength includes the following steps:

[0035] S101, recording the ...

Embodiment 3

[0051] Such as figure 2 As shown, a geomagnetic calibration system based on wireless signal strength, including a geomagnetic detection module, the geomagnetic detection module is used to detect whether there is a vehicle in the parking space and the magnetic field value; a parking space 2.4GHz wireless module, the parking space 2.4GHz module is used for sending and receiving Wireless signal and detect wireless signal value; Parking space detection control module, the parking space detection control module is electrically connected with the geomagnetic detection module and the parking space 2.4GHz wireless module respectively, and the parking space detection control module is used to detect and record whether there is a car or not The magnetic field value and wireless signal value at the same time, and calculate the average value of the magnetic field with the car, the average value of the wireless signal with the car and the average value of the magnetic field without the car...

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Abstract

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.

Description

technical field [0001] The invention relates to a calibration method of a geomagnetic sensor, in particular to a geomagnetic calibration method and system based on wireless signal strength. Background technique [0002] The use of geomagnetic principles for vehicle detection requires initial magnetic field calibration after the installation of the geomagnetic vehicle detector. Because the earth's magnetic field is stable within a few kilometers, and the changes caused by each vehicle to the earth's magnetic field are different, so when the initialization magnetic field calibration work is carried out, it must be required that there is no vehicle parked in the installation parking space. If there is a car parked, the car needs to be moved. In addition, the road parking space itself is a scarce public resource, and it is very difficult to move the car when actually initializing the magnetic field calibration. [0003] In addition, the service life of geomagnetic vehicle detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00G01R33/00G08G1/042
CPCG01V13/00G01R33/0023G08G1/042
Inventor 高全勇刘刚朱长健宋磊
Owner 迈锐数据(无锡)有限公司