CN106373407A - Vehicle detector based on geomagnetic sensing - Google Patents
Vehicle detector based on geomagnetic sensing Download PDFInfo
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- CN106373407A CN106373407A CN201611026958.3A CN201611026958A CN106373407A CN 106373407 A CN106373407 A CN 106373407A CN 201611026958 A CN201611026958 A CN 201611026958A CN 106373407 A CN106373407 A CN 106373407A
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- vehicle
- module
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- hardware system
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
Abstract
The invention relates to the technical field of intelligent transportation, and discloses a vehicle detector. The vehicle detector comprises a hardware system and a software system, and is characterized in that the hardware system includes a master control module, a communication circuit module, a power module and a sensor module; the master control module of the hardware system is an STM32 master control chip, the sensor module integrates a Honeywell magnetic sensor module HMC5843, and the real-time magnetic field intensity is read through an I2C communication protocol; and the software system includes system initialization, identification algorithm initialization, identification algorithm work, magnetic field data reading, filtering processing, vehicle identification, and vehicle information packet sending. The vehicle detection technology based on a magnetic resistance sensor has the characteristics of small size, convenient installation, no reaction to non-ferromagnetic objects and high reliability, and is very effective on dynamic and static vehicle detection, vehicle speed and length estimation, vehicle model classification, and the like.
Description
Technical field
The present invention relates to technical field of intelligent traffic, more specifically, particularly to a kind of wagon detector.
Background technology
Intelligent transport technology increasingly be subject to of concern simultaneously, as the information collection front of intelligent transportation system
One of wagon detector also increasingly paid close attention to by insider.Wagon detector is with motor vehicles for detecting target, inspection
Measuring car by or there is situation, collect relevant information, provide data supporting for intelligent transport system.External from state
See, the wagon detector commonly used at present mainly has magnetic induction coil wagon detector, ultra sonic vehicle detector, infrared vehicle
Detector, laser vehicle detector, video-based vehicle detection etc..Current wagon detector generally existing problems with: size
Greatly, power consumption is high, and anti-interference is weak, installation, maintenance inconvenience.
Content of the invention
It is an object of the invention to provide a kind of wagon detector based on earth magnetism sensing, the vehicle based on magnetoresistive transducer
Detection technique, have that size is little, easy for installation, reactionless to nonferromagnetic object, reliability the features such as, and for sound state car
Detection, speed vehicle commander estimation, vehicle classification etc. have good effect.
When vehicle is close to the detection zone of magnetic force detection sensor, the magnetic line of force of detection zone is squeezed and is polymerized；When
When vehicle will pass through detection zone, the magnetic line of force shrinks further along site polymerization；When vehicle passes through detection zone, magnetic
The line of force be subject to tractive and dissipate along center, so, using amr sensor catch vehicle close, will by and pass through inspection
Survey changing and processing of magnetic line of force during region, it is possible to achieve to vehicle real-time detection.Magnetic field intensity 3 when Fig. 1 passes through for vehicle
The variation tendency of individual durection component.
A kind of wagon detector based on earth magnetism sensing, including hardware system and software system.Hardware system includes master control
Module, communication circuit module, power module, sensing module.Software system includes system initialization, recognizer initialization, knows
Other algorithm work, reading magnetic field data, Filtering Processing, vehicle identification, transmission information of vehicles bag.
A kind of wagon detector based on earth magnetism sensing, including hardware system and software system.Hardware system includes master control
Module, communication circuit module, power module, sensing module.Hardware system adopts stm32 as main control chip, is integrated with Hall
Wei Buddhist nun magnetic sensing module hmc5843, is read real-time magnetic field intensity by i2c communication protocol, is known by earth magnetism vehicle detecting algorithm
Other vehicle by and directional information.
Software system includes system initialization (i2c agreement beginningization, sensor die initialization block), and recognizer initializes,
Subsequently system enters recognizer and starts working, and reads magnetic field data from geomagnetic sensor, begins with Filtering Processing, enters driving
Identification, be such as tested with vehicle, then pass through rs485 to controller send information of vehicles bag.
If sensor main by identify vehicle by when peripherally change of magnetic field strength realize the detection to vehicle, root
The speed passed through according to vehicle, sensor is sampled to absolute force around by certain frequency, and algorithm calculates any time ground
When magnetic intensity is larger with initial background geomagnetic field intensity, it is considered as having car to pass through, now magnetic strength device enters vehicle near state,
Algorithm call direction evaluation algorithm simultaneously, start identify changes of magnetic field rule, thus judge vehicle by direction.Work as sampling
When magnetic field returns the scope of normal geomagnetic field intensity, it is considered as vehicle and leaves, sensor completes a vehicle detection process, to control
Device processed sends vehicle data bag.
Compared with prior art, the present invention adopts the vehicle testing techniques of magnetoresistive transducer, has that size is little, installation side
Just the advantages of, reactionless to nonferromagnetic object, reliability, and for sound state vehicle detection, speed vehicle commander estimates, vehicle is divided
Class etc. has good effect.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the variation tendency of 3 durection components of magnetic field intensity when vehicle passes through.
Fig. 2 is system global structure figure of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the preferred embodiments of the present invention are described in detail, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, thus protection scope of the present invention is made apparent clearly defining.
Refering to shown in Fig. 2, the present invention provides a kind of wagon detector based on earth magnetism sensing, using stm32 as master control
Chip, is integrated with Hall Wei Buddhist nun magnetic sensing module hmc5843, reads real-time magnetic field intensity by i2c communication protocol, by earth magnetism
Vehicle detecting algorithm identify vehicle by and directional information.Accessory structure power module and the detection core of knowledge module composition
Piece, its structured flowchart is as shown in Figure 2.
Software system includes system initialization (i2c agreement beginningization, sensor die initialization block), and recognizer initializes,
Subsequently system enters recognizer and starts working, and reads magnetic field data from geomagnetic sensor, begins with filtering etc. and processes, carries out
Vehicle identification, is such as tested with vehicle, then pass through rs485 and send information of vehicles bag to controller.
The operation principle of the present invention is: sensor mainly by identify vehicle by when peripherally change of magnetic field strength carry out reality
The now detection to vehicle, the speed passed through according to vehicle, sensor is sampled to absolute force around by certain frequency, calculates
When method calculating any time absolute force is larger with initial background geomagnetic field intensity, it is considered as having car to pass through, now magnetic strength device
Entering vehicle near state, algorithm call direction evaluation algorithm simultaneously, starting to identify the rule of changes of magnetic field, thus judging vehicle
By direction.When magnetic field of sampling returns the scope of normal geomagnetic field intensity, it is considered as vehicle and leaves, sensor completes once
Vehicle detection process, sends vehicle data bag to controller.
Although being described in conjunction with the accompanying embodiments of the present invention, patent owner can be in claims
Within the scope of make various modifications or modification, as long as less than the present invention the protection domain described by claim, all should
Within protection scope of the present invention.
Claims (1)
1. a kind of wagon detector based on earth magnetism sensing, including hardware system and software system it is characterised in that: described hardware
System includes main control module, communication circuit module, power module, sensing module；Described hardware system main control module adopts stm32
As main control chip, sensing module Integrated Hall Wei Buddhist nun magnetic sensing module hmc5843, real-time magnetic is read by i2c communication protocol
Field intensity；Described software system includes system initialization, recognizer initialization, recognizer work, reads magnetic field data, filter
Ripple process, vehicle identification, transmission information of vehicles bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026958.3A CN106373407A (en) | 2016-11-22 | 2016-11-22 | Vehicle detector based on geomagnetic sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026958.3A CN106373407A (en) | 2016-11-22 | 2016-11-22 | Vehicle detector based on geomagnetic sensing |
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| CN106373407A true CN106373407A (en) | 2017-02-01 |
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| CN201611026958.3A Pending CN106373407A (en) | 2016-11-22 | 2016-11-22 | Vehicle detector based on geomagnetic sensing |
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Cited By (2)
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| CN109816992A (en) * | 2018-12-13 | 2019-05-28 | 杭州电子科技大学 | A kind of model recognizing method based on Geomagnetic signal |
| CN112687112A (en) * | 2019-10-17 | 2021-04-20 | 中国科学院深圳先进技术研究院 | Geomagnetic detector and control method thereof |
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Application publication date: 20170201 |
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