Environmentally adaptive traffic flow detection method based on terrestrial magnetism

A technology for traffic flow detection and traffic flow, which is applied in the field of traffic monitoring and can solve the problem of low detection accuracy.

Inactive Publication Date: 2014-02-19
ZHEJIANG UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to provide a geomagnetic-based environmental adaptive traffic flow detection method to overcome the problem of low detection accuracy due to environmental changes in the prior art

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  • Environmentally adaptive traffic flow detection method based on terrestrial magnetism
  • Environmentally adaptive traffic flow detection method based on terrestrial magnetism
  • Environmentally adaptive traffic flow detection method based on terrestrial magnetism

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Embodiment Construction

[0034] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, and the following embodiments do not constitute a limitation of the present invention.

[0035] When the vehicle passes directly above the geomagnetic sensor, since the magnetic field generated by the ferromagnetic material contained in the vehicle itself will interfere with the magnetic field distribution in the passing area, the geomagnetic data collected by the geomagnetic sensor is as follows: figure 1 It can be seen from the figure that when the vehicle passes by completely, the strength of the geomagnetic field in this area will return to the level before the vehicle passed by. Geomagnetic sensors can detect such changes in the magnetic field, and thus can be used to detect traffic flow.

[0036] The geomagnetism-based environment adaptive traffic flow detection method of the present invention uses the above-menti...

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Abstract

The invention discloses an environmentally adaptive traffic flow detection method based on terrestrial magnetism. The detection method comprises that terrestrial-magnetism data is acquired through periodical detection; the acquired terrestrial-magnetism data is filtered, and random noise is eliminated; the terrestrial-magnetism data after random noise elimination is compared with a corresponding reference value, and the present state of a state machine is updated; and according to state change of the state machine, the traffic flow is calculated. The reference value is adaptively adjusted according to environmental change, thereby effectively reducing influence of the environmental change on the accuracy of the traffic flow detection method. The environmentally adaptive traffic flow detection method based on terrestrial magnetism improves the accuracy of traffic flow detection.

Description

technical field [0001] The invention belongs to the technical field of traffic monitoring, in particular to a method for detecting road traffic flow by using a geomagnetic sensor. Background technique [0002] With the rapid development of science and technology and economy, the number of motor vehicles in cities is also increasing day by day. Traffic problems such as traffic jams and tight parking spaces are coming one after another, and these traffic problems have plagued urban traffic managers. Urban traffic managers need to make corresponding decisions through various traffic information. Traffic information mainly includes traffic flow, vehicle speed and other information. The acquisition of traffic flow information plays a considerable role in optimizing traffic organization. [0003] Therefore, how to obtain these traffic information accurately, conveniently and quickly is the current research hotspot. Various sensors have been used for traffic flow detection at home...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/042G08G1/065
Inventor 夏明黄昊程董亚波张海洋
Owner ZHEJIANG UNIV OF TECH
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