CN101383095A - Ultrasonic fixing type traffic flow investigation equipment - Google Patents
Ultrasonic fixing type traffic flow investigation equipment Download PDFInfo
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- CN101383095A CN101383095A CNA2008100489794A CN200810048979A CN101383095A CN 101383095 A CN101383095 A CN 101383095A CN A2008100489794 A CNA2008100489794 A CN A2008100489794A CN 200810048979 A CN200810048979 A CN 200810048979A CN 101383095 A CN101383095 A CN 101383095A
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Abstract
The invention relates to fixed supersonic traffic flow investigating equipment which comprises two supersonic probes (1). The two supersonic probes (1) are mounted in the radial direction on each track to be detected, are fixed on a support (2) at the upper end of a road, and are connected with a supersonic detector which is connected with a data transmission terminal, and the data transmission terminal transmits data to a data center through the Internet. The invention overcomes the defects of poor reliability and the like of the prior traffic flow detector and has the advantages of long service life, high detection accuracy, and the like.
Description
Technical field
The present invention relates to a kind of ultrasonic fixed traffic flow investigation equipment, it is to utilize the ultrasound examination principle, by the computer general-purpose The Application of Technology, realize the information of vehicle flowrate collection of highway (highway), bridge, tunnel and special road section, the equipment of authentic and valid reflection traffic flow data.
Background technology
There has been the very long general time in ultrasound wave already in large nature before knowing for the mankind.In the animal as bat, whale, dolphin promptly be with the sonar ripple as running guide-localization, at present, ultrasound wave has been widely used in purposes such as industry, navigation and medical treatment.Ultrasound wave starts from Japan in the application of intermodulation industry.Early stage analog ultrasound wave intermodulation instrument was both heavy, troublesome poeration, and discernible vehicle kind is less; After digitalized ultrasonic wave system system occurring, major step has just been added in the application of ultrasound wave aspect intermodulation, and not only detection quality is stable, has increased the possibility that result of detection is handled again simultaneously, for paving the way appears in ultrasonic imaging.In recent years because the significantly progress of computer industry, driven the research of Related product, the upgrading of the expansion of hard-disk capacity, the amplification of internal memory, central processing unit, it is many to make the transmission of data and computing quicken, so digitized ultrasonic imaging formula intermodulation system has become the direction of a research.But the reliability of existing product is relatively poor, the price of product is higher.
The data of magnitude of traffic flow collection comprise vehicle, flow and three fundamental elements of the speed of a motor vehicle, wherein, have finished vehicle identification and just can directly obtain data on flows, so the checkout equipment on foreground is actually finishes two detections: the vehicle identification and the speed of a motor vehicle detect.
The ultimate principle of the ultrasound examination magnitude of traffic flow: detect road surface moving object height change curve.Vehicle recognition principle: identification longitudinal direction of car outer contour.Speed of a motor vehicle recognition principle: vehicle is by the mistiming identification speed of a motor vehicle of front and back probe.
Summary of the invention
The objective of the invention is to overcome weak points such as reliability that above-mentioned existing background technology detects is relatively poor, and a kind of ultrasonic fixed traffic flow investigation equipment is provided.
The objective of the invention is to reach: ultrasonic fixed traffic flow investigation equipment by following measure, it comprises that being positioned at each is examined the track two ultrasonic probes radially are installed, ultrasonic probe is fixed on the support of highway upper end, it is characterized in that described ultrasonic probe is connected with ultrasonic detector, ultrasonic detector is connected with data transmission terminal, data transmission terminal is sent to data center by internet, ultrasonic probe is successively to road emission sound wave, obtain the information of vehicles that passes through, ultrasonic detector is collected from the information of vehicles of probe, calculate type of vehicle, the transport information that clients such as speed need, data transmission terminal is transferred to data center by internet with transport information.
In technique scheme, square-wave generator, driving circuit, ultrasound transmitter device, amplifying circuit, comparator circuit, ultrasonic receiver are installed in the described ultrasonic probe, square-wave generator generates the square-wave signal of appointment, drives ultrasound transmitter device to below, road surface emission ultrasound wave by driving circuit; Ultrasound wave arrives upwards reflection behind the road surface, is received by ultrasonic receiver, and ultrasonic receiver can amplify by amplifying circuit after receiving signal, after deliver to comparator circuit, stack sends the start signal of square wave, calculates difference.
In technique scheme, described ultrasonic detector comprises single-chip microcomputer, I/O mouth extended chip and 104 host machine part, behind the stack difference signal that after receiving comparator circuit, send, take a sample by single-chip microcomputer, the vehicular sideview data for projection is turned to one group of height number, 104 host machine part are differentiated altitude information, calculate traffic parameters such as type of vehicle, speed, time headway, and after deliver to data transmission terminal.
Ultrasonic fixed traffic flow investigation equipment of the present invention has following advantage: the characteristics of ultrasound examination are to rely on contour of the vehicle identification, and probe is installed vertically downward, relies on sonic detection.1., probe do not contact fully with vehicle, long service life is not destroyed the road surface fully, needs maintaining hardly.The road surface is carried out maintenance and equipment is not impacted.System maintenance is with low cost.2., probe installs vertically downward, all there is own special sensor in each track, and other contactless devices generally to be side direction install many tracks of a sensor.Under the bigger situation of traffic density, use ultrasonic detector to detect, can not take place between vehicle to block the accuracy of detection height mutually.3., ultrasound examination is to discern vehicle by the continuous detecting height of car, what read in identification module is the radially outer molded lines of vehicle, similar with the foundation of artificial cognition, the vehicle recognition result that draws is near the artificial cognition result.4., equipment uses the Modulated Ultrasonic ripple as detecting medium, common disturbing factor such as illumination condition, sleet, dense fog, dust storm, city noise etc. all can not impact identification, recognition result is accurately credible.5., this equipment utilization advanced person's full-automatic detection means replaces the complicate statistics vehicle flowrate data that fall behind, and changed loaded down with trivial details, slow, the situation that lacks accurate foundation of original manual statistics, improves constantly work efficiency and quality.6., technology such as the communication information of this equipment complex uses advanced, network, control automatically, traffic engineering, improve the ruuning situation of traffic and transportation system, improve conevying efficiency and security, reduce traffic hazard, reduce environmental pollution, thereby set up the overall transportation system of intelligentized, safe, convenient, comfortable a, environmental protection.
Description of drawings
Fig. 1 is ultrasonic imaging identification vehicle coordinate figure of the present invention.
Fig. 2 is the scheme of installation of ultrasonic probe of the present invention on the track.
Fig. 3 is the block diagram of ultrasonic probe among the present invention and ultrasonic detector.
Fig. 4 is a system construction drawing of the present invention.
Embodiment
Describe performance of the present invention in detail below in conjunction with accompanying drawing, but they do not constitute limitation of the invention, only do for example.Simultaneously by illustrating that advantage of the present invention will become clear more and understanding easily.
Consult accompanying drawing as can be known: ultrasonic fixed traffic flow investigation equipment, it comprises that being positioned at each is examined the track two ultrasonic probes radially are installed, ultrasonic probe is fixed on the support of highway upper end, it is characterized in that described ultrasonic probe is connected with ultrasonic detector, ultrasonic detector is connected with data transmission terminal, data transmission terminal is sent to data center by internet, ultrasonic probe is successively to road emission sound wave, obtain the information of vehicles that passes through, ultrasonic detector is collected from the information of vehicles of probe, calculate type of vehicle, the transport information that clients such as speed need, data transmission terminal is transferred to data center (as Fig. 1 by internet with transport information, Fig. 2, shown in Figure 4).
Square-wave generator, driving circuit, ultrasound transmitter device, amplifying circuit, comparator circuit, ultrasonic receiver are installed in the ultrasonic probe, square-wave generator generates the square-wave signal of appointment, drives ultrasound transmitter device to below, road surface emission ultrasound wave by driving circuit; Ultrasound wave arrives upwards reflection behind the road surface, is received by ultrasonic receiver, and ultrasonic receiver can amplify by amplifying circuit after receiving signal, after deliver to comparator circuit, stack sends the start signal of square wave, calculates difference (as shown in Figure 3).
Ultrasonic detector comprises single-chip microcomputer, I/O mouth extended chip and 104 host machine part, behind the stack difference signal that after receiving comparator circuit, send, take a sample by single-chip microcomputer, the vehicular sideview data for projection is turned to one group of height number, 104 host machine part are differentiated altitude information, calculate traffic parameters such as type of vehicle, speed, time headway, and after deliver to data transmission terminal (as shown in Figure 3).
Using the method for ultrasonic imaging identification vehicle is to obtain vehicle side to image (as shown in Figure 1), and this has omitted details fully, and the pure image of being made up of height H and radical length L fully can identified vehicle " minibus ".
The working method of common ultrasonic imaging (two dimension), mainly can be divided into two kinds: first kind is mechanical type motor probe (Mechanical device), drive built-in ultrasonic probe by motor, in set scope,, obtain a series of two dimensional image with constant scanning.Second kind for magnetic field location image obtains, and utilizes electromagnetic field to do the two-dimensional space location for each group data that probe obtained, and again data and spatial information is integrated with data processor and does the synthetic two dimensional image of computing.
Because the characteristics of intermodulation work, mechanical type motor probe is obviously inadvisable, complicated and accurate moving component is difficult to reach the reliability requirement of outdoor all weather operations, though and locate mode probe in magnetic field can satisfy reliability requirement, and on the ultrasound wave intermodulation equipment of part import, find application, but system complex costs an arm and a leg.
Ultrasonic fixed traffic flow investigation equipment of the present invention has adopted stationary probe, probe is vertically mounted on the top, road surface, to the road surface emission pulse ultrasonic, and the ultrasound wave of reception reflected back, by measuring the mistiming t of sound wave emissions and reception, can calculate road surface relative height h0.
The h0=V velocity of sound * t/2
When vehicle passed through this detecting device below, the relative height on road surface was changed to h1, so just can calculate the height value H of this car.
H＝h0-h1
By continuous emission ultrasound wave, can obtain one group of vehicle height value H1, H2, H3......Hn that changes.
The data that obtain like this are one group of sampled datas, as long as obtain the radical length data L of each data correspondence in theory, and the sampling interval time are reduced to infinitesimal, just can obtain being examined vehicle two dimensional image radially accurately.
In order to obtain the radical length of vehicle, ultrasound wave magnitude of traffic flow observation subsystem is examined the track at each two ultrasonic probes (as shown in Figure 2) radially is installed, because the spaced radial of two probes distance is known, by just judging the vehicle radical length that each h value is corresponding accurately to the contrast of two probe transmitting-receiving times.The vehicle radical length L that this mode is obtained is very accurate, and sees the moment speed of a motor vehicle and average speed when obtaining vehicle accurately by the probe below by account form, and computing formula is as follows:
K is the sequence number that vehicle occurs
The mean flow rate of road surface wagon flow is:
N
2, N
1Be respectively the zero-time of metering time
As described above, as long as the sampling interval time is reduced to infinitesimal, just can obtain being examined vehicle two dimensional image radially accurately.But too little sampling interval time can cause system complexity to rise, and ultrasound wave magnitude of traffic flow observation subsystem of the present invention has adopted advanced sound field rebuilding algorithm.A complete 2D image is made up of many pixels, and the least unit of two-dimensional acoustic field then is made up of voxel.Obtain when coming from probe when a series of 2D data, just must fill up automatically by computing machine in the gap of two groups of data, fill up utilization itself the mathematical operation employing be law of average (interpolation method); In other words, the voxel numerical value of any point the unknown in the image will be filled up the two-dimensional acoustic field of finishing and just form a complete two dimensional image by contiguous 2 known pixels by the decision of interpolation method.
Ultrasonic fixed traffic flow investigation equipment performance index of the present invention:
Claims (3)
1, ultrasonic fixed traffic flow investigation equipment, it comprises that being positioned at each is examined the track two ultrasonic probes (1) radially are installed, ultrasonic probe (1) is fixed on the support (2) of highway upper end, it is characterized in that described ultrasonic probe (1) is connected with ultrasonic detector, ultrasonic detector is connected with data transmission terminal, data transmission terminal is sent to data center by internet, ultrasonic probe (1) is successively to road emission sound wave, obtain the information of vehicles that passes through, ultrasonic detector is collected from the information of vehicles of probe, calculate type of vehicle, the transport information that clients such as speed need, data transmission terminal is transferred to data center by internet with transport information.
2, ultrasonic fixed traffic flow investigation equipment according to claim 1, it is characterized in that in the described ultrasonic probe (1) square-wave generator, driving circuit, ultrasound transmitter device, amplifying circuit, comparator circuit, ultrasonic receiver being installed, square-wave generator generates the square-wave signal of appointment, drives ultrasound transmitter device to below, road surface emission ultrasound wave by driving circuit; Ultrasound wave arrives upwards reflection behind the road surface, is received by ultrasonic receiver, and ultrasonic receiver can amplify by amplifying circuit after receiving signal, after deliver to comparator circuit, stack sends the start signal of square wave, calculates difference.
3, ultrasonic fixed traffic flow investigation equipment according to claim 1, it is characterized in that ultrasonic detector comprises single-chip microcomputer, I/O mouth extended chip and 104 host machine part, behind the stack difference signal that after receiving comparator circuit, send, take a sample by single-chip microcomputer, the vehicular sideview data for projection is turned to one group of height number, 104 host machine part are differentiated altitude information, calculate traffic parameters such as type of vehicle, speed, time headway, and after deliver to data transmission terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100489794A CN101383095A (en) | 2008-08-25 | 2008-08-25 | Ultrasonic fixing type traffic flow investigation equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100489794A CN101383095A (en) | 2008-08-25 | 2008-08-25 | Ultrasonic fixing type traffic flow investigation equipment |
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| CN101383095A true CN101383095A (en) | 2009-03-11 |
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| CNA2008100489794A Pending CN101383095A (en) | 2008-08-25 | 2008-08-25 | Ultrasonic fixing type traffic flow investigation equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833860A (en) * | 2010-05-11 | 2010-09-15 | 武汉市路安电子科技有限公司 | High-precision ultrasonic fixed traffic flow investigation equipment |
| CN102917351A (en) * | 2011-08-05 | 2013-02-06 | 中国移动通信集团公司 | Method and device for realizing application in user identification card and user identification card |
| CN108399753A (en) * | 2018-03-01 | 2018-08-14 | 山东建筑大学 | Vehicle tracing method and system based on ultrasonic wave wave-record chart |
| CN110246348A (en) * | 2019-04-10 | 2019-09-17 | 中冶南方工程技术有限公司 | A kind of through street intelligent speed-limiting device |
-
2008
- 2008-08-25 CN CNA2008100489794A patent/CN101383095A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833860A (en) * | 2010-05-11 | 2010-09-15 | 武汉市路安电子科技有限公司 | High-precision ultrasonic fixed traffic flow investigation equipment |
| CN102917351A (en) * | 2011-08-05 | 2013-02-06 | 中国移动通信集团公司 | Method and device for realizing application in user identification card and user identification card |
| CN102917351B (en) * | 2011-08-05 | 2015-04-01 | 中国移动通信集团公司 | Method and device for realizing application in user identification card and user identification card |
| CN108399753A (en) * | 2018-03-01 | 2018-08-14 | 山东建筑大学 | Vehicle tracing method and system based on ultrasonic wave wave-record chart |
| CN110246348A (en) * | 2019-04-10 | 2019-09-17 | 中冶南方工程技术有限公司 | A kind of through street intelligent speed-limiting device |
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Open date: 20090311 |