CN106683416A - Ground induction coil vehicle inspection device background noise removal method and device - Google Patents
Ground induction coil vehicle inspection device background noise removal method and device Download PDFInfo
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- CN106683416A CN106683416A CN201710008914.6A CN201710008914A CN106683416A CN 106683416 A CN106683416 A CN 106683416A CN 201710008914 A CN201710008914 A CN 201710008914A CN 106683416 A CN106683416 A CN 106683416A
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- background noise
- induction coil
- vehicle checker
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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
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Abstract
The present invention provides a ground induction coil vehicle inspection device background noise removal method and device. A amplitude threshold and a time threshold matching with the background noise are set, the iteration is determined to allow the device to determine the instantaneous noise and the stable state noise so as to reject the background noise. The method and device also can employ a plurality of vehicle inspection devices as reference modules to perform mutual comparison to identify the background noise to allow the detection method to improve the parking stall information accuracy rate above 98%. The device provided by the invention is arranged in the vehicle deceleration strip, can be installed for usage with no need for embedment underground, and is wide in application range.
Description
Technical field
The present invention relates to a kind of vehicle geomagnetism detecting technology, more particularly to the dress that a kind of geomagnetic sensor background noise is removed
Put and method.
Background technology
Intelligent city's concept is progressively well known, and wherein intelligent transportation is its important ring.Intelligent road, intelligent parking
Field etc. is put forward higher requirement by vehicle detecting sensor.In the prior art, mainly there is induction coil, microwave technology, red
Outer technology, video identification and radio-frequency technique etc..Sense coil vehicle checker be current collection vehicle stop information predominantly detect handss
Section.Its object is to gather road-surface concrete information, instant sending signal (parking space information) gives communication base station.
Hall linear magnetic field sensor as sensor output voltage, under being disposed at the road surface that vehicle was said.No
When vehicle is passed through, the low-voltage of Hall linear transducer output；When having vehicle to cross from sensor to park, the ground of sensor
Magnetic magnetic field intensity strengthens, Hall linear magnetic field sensor output HIGH voltage.Judge whether vehicle enters by the change of comparison voltage
Cross, it is close, park or sail out of.
Patent documentation 1：CN205491510U
Patent documentation 2：CN205194074U
Patent documentation 3：CN205211169U
Patent documentation 4：CN101383097U
Patent documentation 5：CN2731611Y
Patent documentation 6：CN2708418Y
Patent documentation 7：CN104076404A
Due to all being installed using buried mode mostly in prior art, cause not easy to install, pavement destruction, be suitable for model
Enclose limited, power supply laying difficulty etc..Simultaneously geomagnetic sensor has the shortcomings that itself as magnetic inductor, i.e., be easily subject to earth magnetism
Background noise affects, and detects the shortcomings of rate of false alarm is high.
The content of the invention
In view of the above problems, ground induction coil vehicle checker of the present invention is set to speed bump structure to the present invention, without buried i.e. real
Installation is applied, earth construction is not destroyed.Simultaneously the characteristics of analysis background magnetic noise, or being slowly varying, or after occurring suddenly
Disappear, the persistent period is shorter；And the magnetic variation signal amplitude and rate of change of detected object vehicle be not in an order of magnitude scope
It is interior.Therefore, the application arranges background magnetic noise parameter, and by real-time detection the parameter is replaced, and by noise amplitude threshold and
The impact that background magnetic noise is caused is screened and cut down by way of iteration to time threshold noise signal, and right to retaining its
The sensitivity in vertiginous magnetic field.In accordance with the invention it is possible to provide a kind of method for being easily installed, eliminating earth magnetism background noise
And ground induction coil vehicle checker.
Description of the drawings
Fig. 1, ground induction coil vehicle checker surface structure of the present invention
Fig. 2, feel vehicle checker module concrete structure
The modular structure of Fig. 3, ground induction coil vehicle checker
Fig. 4, ground induction coil vehicle checker background noise minimizing technology flow chart
Vehicle checker module is felt in Fig. 5, the configuration of same ground induction coil vehicle checker multiplely
Laying scheme is installed on Fig. 6, road surface
Specific embodiment
Hereinafter, embodiments of the invention are illustrated referring to the drawings.Embodiment 1, Fig. 1 shows the overall structure of the present invention
Into.Detection means 1 includes ground sense vehicle checker module 2 and power module 3, is set to the belt shape that typically slows down, surface be arc or
Similar structures.Feel vehicle checker module 2 and be arranged in the middle of two power modules 3 in ground.The top of battery module 3 and ground sense car test module
2 top collectively forms arc or similar structures, whole device is constituted and is protected, and deceleration salient point can be arranged thereon.Ground sense car
Inspection device module 2 is realized electrically connecting with power module 3, and power module 3 is felt over the ground vehicle checker module 2 and is powered.
Power module 3 can be external power supply, battery or mechanical automatic generating structure or its combination.When power module 3 is machine
During tool automatic generating structure, the mechanical energy that achievable automobile is rolled is changed into electronic.
Fig. 2 feels the concrete structure of vehicle checker module 2 with showing, ground sense vehicle checker module 2 includes protection department 21, sensor
22 and 23 control modules.Protection department 21 is the housing that top is arc or similar structures, is rigidity or semi-compliant structure, with power supply
Module 3 coordinates the mechanical deformation being capable of achieving in subrange.Sensor 22 can be ground induction coil, piezoelectric transducer, metal foil
The sensors such as film magnetic resistance type, can detect vehicles drive signal.The control module of sensor 22 and 23 is electrically connected, by power module
3 pairs its be powered.
Fig. 3 shows the concrete structure of control module 23.Control module 23 is by operational part 231, magnetic signal process circuit
232nd, referrer module 233 and radio receiving transmitting module 234 are constituted.Signal processing circuit 232 receives the signal of sensor 22, to carrying out
Trimming filters and is sent to operational part 231.Operational part 231 receives the reference letter of the signal of signal processing part 232 and referrer module
Computing judgement is carried out to it after number, judged result is transmitted by radio receiving transmitting module 234.Radio receiving transmitting module 234 will be believed
Number host computer or other referrer modules are sent to, and receive the signal that the control signal or other control modules of host computer are transmitted.
Referrer module 233 receives the reference signal that host computer or other vehicle checker control modules send, and the signal can be by wireless receiving and dispatching
Module is transmitted.
Signal processing circuit 232 receives the signal of sensor 22, and to carrying out trimming filtering, using gaussian filtering, its is concrete
Step is：Wherein σsDetermine the width of Gaussian function, xsIt is the sensor signal.
Fig. 4 shows the major calculations step of operational part of the present invention.
Step 1, initializes P0、P1、t、Pmax1、Pmax2, Tmax, wherein Pmax1＜ Pmax2；
Step 2, obtain field signal carries out wavelet de-noising to it, will set P after its noise reduction1；
Step 3, judges P1-P0≤Pmax1If, into step 7；If it is not, into step 4；
Step 4, judgement P1-P0≤Pmax2If, into step 6, if not into step 5；
Step 5, judgement nearby have car to move, and record P1-P0；
Step 6, by t=t+1, judge t >=TmaxIf, so that t=0, into step 7；If being otherwise directly entered step
2；
Step 7, cause P0=P1, return to step 2；
Wherein step 2 carries out wavelet de-noising to magnetic field, and the step specifically includes following steps：
E, choose wavelet basis function and determine wavelet decomposition level；
F, signal is filtered process, obtains wavelet coefficient；
G, according to default wavelet decomposition level, carry out threshold value quantizing process to wavelet coefficient, obtain the small echo after quantifying
Coefficient；
H, by wavelet reconstruction filtering obtain reconstruction signal.
Step c also includes, according to equation below threshold value quantizing process is carried out,
Wherein, σ is poor for noise criteria, mid (| d1,k|) for ground floor high frequency coefficient absolute intermediate value, D for noise standard
Poor regulation coefficient, N is the length of signal, and T is small echo quantization threshold.
Embodiment 2, such as Fig. 5, Fig. 6 or both are combined, and build multiple detection sensor arrays, mutually reference.By embodiment 1
Middle increase implements the dual pathways or the relevant suppression background earth magnetism noise step of multichannel with referrer module 233.The referrer module 233 can
Think that the ground inside the signal or other detection means 1 of the transmission of car detection module 2 is felt on other ground inside same detection means 1
The signal that sense car detection module 2 sends.
N number of sensor detection signal, y are obtained respectively in the particular sample time period1(n)、y2(n)…yNN (), is converted
For frequency domain Y1(ω, k), Y2(ω,k)…YN(ω, k), wherein k data windows ordinal number, ω representation signal frequencies.By each frequency domain
Signal is concerned with asks for common power spectrum two-by-two, and the power spectrum is ascended the throne, and (ω, k), by background noise E, (ω k) turns background noise E
Time domain e (n) is changed to, the step 7 in Jing embodiments 1 is revised as：
Step 7, cause P0=min (P1, e), return to step 2, other normal calculating.
The ground induction coil vehicle checker of the present invention is set to speed bump structure, is capable of achieving to install without buried, not destructively
Face structure, strong adaptability.Simultaneously arrange parameter is changed according to background magnetic field change, makes the device reduce the interference of background magnetic noise,
Nor affect on its sensitivity.Decayed slowly varying changes of magnetic field, optionally has sensitivity to vertiginous magnetic field
Property.Whether disturbance of magnetic field amount has the stable change beyond threshold value in detection certain hour, contrasts standard when having car in parking stall
Disturbance of magnetic field amount carrying out judging whether parking stall has car, the determination methods can by parking space information accuracy rate bring up to 98% with
On.
Claims (10)
1. a kind of method that ground induction coil vehicle checker background noise is removed, the method comprises the steps：
Step 1, initializes P0、P1、t、Pmax1、Pmax2, Tmax, wherein Pmax1＜ Pmax2；
Step 2, obtain field signal carries out wavelet de-noising to it, will set P after its noise reduction1；
Step 3, judges P1-P0≤Pmax1If, into step 7；If it is not, into step 4；
Step 4, judgement P1-P0≤Pmax2If, into step 6, if not into step 5；
Step 5, judgement nearby have car to move, and record P1；
Step 6, by t=t+1, judge t >=TmaxIf, so that t=0, into step 7；If being otherwise directly entered step 2；
Step 7, cause P0=P1, return to step 2.
2. the method that ground induction coil vehicle checker background noise according to claim 1 is removed, wherein step 2 is carried out to magnetic field
Wavelet de-noising, the step specifically includes following steps：
A, choose wavelet basis function and determine wavelet decomposition level；
B, signal is filtered process, obtains wavelet coefficient；
C, according to default wavelet decomposition level, carry out threshold value quantizing process to wavelet coefficient, obtain the wavelet coefficient after quantifying；
D, by wavelet reconstruction filtering obtain reconstruction signal.
3. the method that ground induction coil vehicle checker background noise according to claim 2 is removed, step c also includes, root
Threshold value quantizing process is carried out according to equation below,
Wherein, σ is poor for noise criteria, mid (| d1,k|) for the absolute intermediate value of ground floor high frequency coefficient, D for noise standard deviation
Regulation coefficient, N is the length of signal, and T is small echo quantization threshold.
4. a kind of method that ground induction coil vehicle checker background noise is removed, the method comprises the steps：
Step 1, initializes P0、P1、t、Pmax1、Pmax2, Tmax, wherein Pmax1＜ Pmax2；
Step 2, obtain field signal carries out wavelet de-noising to it, will set P after its noise reduction1；
Step 3, judges P1-P0≤Pmax1If, into step 7；If it is not, into step 4；
Step 4, judgement P1-P0≤Pmax2If, into step 6, if not into step 5；
Step 5, judgement nearby have car to move, and record P1；
Step 6, by t=t+1, judge t >=TmaxIf, so that t=0, into step 7；If being otherwise directly entered step 2；
Step 7, the multiple detection sensor arrays of structure, N is obtained respectively in the particular sample time period by detection sensor array
Individual sensor detection signal, y1(n)、y2(n)…yNN (), is converted into frequency domain Y1(ω, k), Y2(ω,k)…YN(ω,k),
Wherein k data windows ordinal number, ω representation signal frequencies；Each frequency-region signal is concerned with two-by-two and asks for common power spectrum, the work(
Rate spectrum is ascended the throne, and (ω, k), by background noise E, (ω k) is converted to time domain e (n) to background noise E；So that P0=min (P1, e), return
Step 2.
5. a kind of ground induction coil vehicle checker background noise removal device, the device includes ground sense vehicle checker module (2) and power supply mould
Block (3), is totally set to the belt shape that typically slows down, and surface is arc or similar structures.
6. ground induction coil vehicle checker background noise removal device according to claim 5, ground sense vehicle checker module (2) is arranged
In the middle of two power modules (3), collectively form at the top of the top and ground sense car test module (2) of battery module (3) arc or
Similar structures, constitute to whole device and protect, and deceleration salient point can be arranged thereon；Ground sense vehicle checker module (2) and power module 3
Electrical connection is realized, power module (3) is felt over the ground vehicle checker module (2) and is powered.
7. ground induction coil vehicle checker background noise removal device according to claim 6, the power module (3) can be
External power supply, battery or mechanical automatic generating structure or its combination；When power module 3 is mechanical automatic generating structure, vapour is capable of achieving
The mechanical energy that car is rolled is changed into electronic.
8. ground induction coil vehicle checker background noise removal device according to claim 7, feels vehicle checker module (2) describedly
Including protection department (21), sensor (22) and control module (23)；Protection department 21 is the housing that top is arc or similar structures,
For rigidity or semi-compliant structure, the mechanical deformation being capable of achieving in subrange is coordinated with power module (3)；Sensor (22) can be with
It is the sensors such as ground induction coil, piezoelectric transducer, metal film magnetoresistance formula, vehicles drive signal can be detected；Sensor 22
With the electrical connection of 23 control modules, it is powered by power module 3.
9. ground induction coil vehicle checker background noise removal device according to claim 8, control module (23) is by operational part
(231), magnetic signal process circuit (232), referrer module (233) and radio receiving transmitting module (234) are constituted；Signal processing circuit
(232) signal of sensor (22) is received, to carrying out trimming operational part (231) is filtered and be sent to；Operational part (231) receives letter
Computing judgement is carried out to it after number signal of processing unit (232) and the reference signal of referrer module, to judged result by wirelessly receiving
Send out module (234) to be transmitted；Radio receiving transmitting module (234) transmits signals to host computer or other referrer modules, and receives
The signal that the control signal of host computer or other control modules are transmitted；Referrer module (233) receives host computer or other vehicle checkers
The reference signal that control module sends, the signal can be transmitted by radio receiving transmitting module.
10. ground induction coil vehicle checker background noise removal device according to claim 9, can implement such as claim 1-
4 any background noise methods.
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| CN201710008914.6A CN106683416B (en) | 2017-01-06 | 2017-01-06 | Ground sensing vehicle detector background noise removing method and device |
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Cited By (1)
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| CN106683416B (en) | 2021-03-02 |
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