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Method and device for speed measurement based on geomagnetic sensing

A technology of geomagnetic sensing and speed measuring device, which is applied to traffic control systems, instruments, and traffic control systems of road vehicles, etc., can solve the problems that video speed measurement is easy to be detected by drivers, radar speed measurement is manned, and coil speed measurement is difficult to carry. It is convenient for regular maintenance, no need for personnel on duty, and easy to replace.

Active Publication Date: 2017-01-25
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These speed measurement technologies are relatively mature and have been widely used, but there are still many problems, such as radar speed measurement needs to be manned, laser speed measurement is expensive, coil speed measurement is difficult to carry, and video speed measurement is easy to be detected by drivers, etc.

Method used

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  • Method and device for speed measurement based on geomagnetic sensing
  • Method and device for speed measurement based on geomagnetic sensing
  • Method and device for speed measurement based on geomagnetic sensing

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Embodiment 1

[0037] like figure 1 , 2 As shown, the geomagnetic sensor uses the magnetoresistance effect of ferromagnetic metal iron, cobalt, nickel and their alloys. in figure 1(a) is a schematic diagram of the angle θ between the bias current I and the magnetic field direction M when there is no magnetic field, figure 1 (b) is a schematic diagram of the angle θ between the bias current I and the direction of the magnetic field M when there is a magnetic field. Depend on figure 2 It can be seen that the resistance value of the ferromagnetic metal decreases with the increase of the angle θ between the bias current I and the magnetic field direction M.

[0038] The geomagnetic sensor is composed of a Wheatstone bridge. When the magnetic field changes, the resistance in the bridge converts the change of the magnetic field into a differential voltage output by using the characteristic that the resistance value of the nickel-iron alloy changes with the magnetic field. By amplifying the ou...

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Abstract

The invention discloses a method and a device for speed measurement based on geomagnetic sensing. The method comprises the following steps of: arranging multiple groups of geomagnetic sensor nodes on a same lane of a road, each group comprising two geomagnetic sensors with a fixed distance and in the same direction; detecting, by the geomagnetic sensors, a passing situation of vehicles by using a fixed threshold value method: setting a fixed geomagnetic strength as a threshold value, and determining the arrival of a vehicle when detecting that the magnetic field strength is changed and continuously exceeds the threshold value; determining the departure of the vehicle when the magnetic field strength is changed and is continuously smaller than the threshold value; and according to the distance between two geomagnetic sensors in each group of the geomagnetic sensor nodes, and the times of the arrival and departure of the vehicle, calculating the driving speed of the vehicle in this period of time, wherein the average value of the driving speeds of the vehicle, calculated by the multiple groups of geomagnetic sensor nodes, is a finally measured driving speed of the vehicle. By use of the method and the device disclosed by the invention, overspeed phenomena on a common road or an expressway can be effectively detected and corrected in time, so that the method and the device have the characteristics of strong function, low price, convenience, flexibility and the like.

Description

technical field [0001] The invention relates to the technical field of vehicle speed measurement, in particular to a speed measurement method and device based on geomagnetic sensing. Background technique [0002] In recent decades, due to the rapid development of the automobile industry, the number of automobiles has increased sharply, the traffic flow has increased, the ratio between the growth rate of vehicles and the development speed of road construction has been seriously out of balance, and traffic management has caused frequent traffic accidents. a major public hazard. The economic loss caused by road traffic accidents in many countries is about 1% of their national economic output. Therefore, people call road traffic accidents "disease of modern civilization" and "endless war". [0003] There are many reasons for road traffic accidents, mainly including driver factors, pedestrian factors, road factors and management factors, among which speeding is one of the most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/042G08G1/052
CPCG08G1/042G08G1/052
Inventor 李建妹李千目戚湧王印海
Owner NANJING UNIV OF SCI & TECH
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