CN102622783B - Multilane free-flow electronic toll collection method based on accurate position match - Google Patents
Multilane free-flow electronic toll collection method based on accurate position match Download PDFInfo
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Abstract
A multilane free-flow electronic toll collection method based on accurate position match is characterized in that electronic tag positioning and vehicle position detected results are matched to achieve multilane free-flow electronic toll collection. The method comprises the following steps: 1, obtaining vehicle-mounted electronic tag positions, vehicle positions and vehicle images to perform electronic on-stream toll collection; 2, accurately matching the vehicle-mounted electronic tag positions and the vehicle positions to distinguish legal vehicles and illegal vehicles; and 3, performing background data processing, storing images, license numbers and illegal passing records of the illegal vehicles to be used as the basis of toll collection. By accurately matching the vehicle detected results and electronic tag positioning results, the judgment of the legal vehicles and the illegal vehicles is achieved, and accordingly the multilane free-flow electronic toll collection is achieved.
Description
Technical field
The present invention relates to intelligent transportation system (Intelligent Transport System, be called for short: ITS) field, relate to multilane Free-flow electronic toll method, particularly a kind of multilane Free-flow electronic toll method based on exact position coupling.
Background technology
At present, a lot of provinces and cities of China have all built highway electric non-stop toll (Electronic Toll Collection, abbreviation: ETC) system.Existing highway electric Fare Collection System adopts bicycle road pattern, and the vehicle that vehicle carried electronic label is installed need to enter the track of appointment, take low speed (highway ETC track speed limit is as 20km/h at present), passes through ETC track; For the illegal vehicle that enters ETC track, track railing is tackled automatically, by manual intervention processing.
ETC system is by the mode of radio communication, to realize charge transaction by ETC antenna and vehicle carried electronic label, and communication protocol adopts Dedicated Short Range Communications, (Dedicated Short Range Communication is called for short DSRC) agreement.Its processing procedure is: ETC antenna (Road Side Unit, be called for short RSU) descending BST (the Beacon Service Table of periodic transmission, beacon service table) signal, vehicle carried electronic label (or board units is installed, On-Board Unit, is called for short OBU) vehicle while sailing ETC area of charge into, receive BST signal, return to VST (Vehicle Service Table, vehicle service table) signal.In VST signal, include MAC (Media Access Control, media interviews control) address, sequence number and other information of vehicle carried electronic label, wherein the MAC Address of vehicle carried electronic label is the main identification code of itself and antenna communication.Antenna is received after up DSRC signal data frame, with its MAC Address, is distinguished different vehicle carried electronic labels; Antenna is issued the downgoing signal Frame of different vehicle carried electronic labels, all the proprietary link identification take the MAC Address of target vehicle carried electronic label as downlink frame.Vehicle carried electronic label receives only the downlink data frame that proprietary link identification is identical with the MAC Address of oneself.After antenna is received VST signal, first carry out safety certification with vehicle carried electronic label, it is legal vehicle that authentication is passed through rear, carries out ETC charge transaction.After ETC transaction communications finishes, antenna transmission END instruction, then continues the periodic descending BST signal of transmitting, waits for sailing into of follow-up vehicle.
Existing ETC antenna has the structure of transceiver, also has the structure of emitting antenna and receiving antenna split, but emitting antenna and receiving antenna do not possess vehicle location function.
Although the relatively traditional manual toll collection of E-payment system of bicycle road pattern has very large technical progress, improved lane capacity, reduced the service time of paying dues, played the effect of energy-saving and emission-reduction, but still exist, civil engineering costs is higher, the speed that is open to traffic is relatively low, illegal vehicle needs the inconvenience such as on-the-spot artificial treatment.In order to adapt to highway and urban road barrier free accessibility and charge, a kind of imagination that is called as multilane Free-flow electronic toll system is suggested.
The electronic charging of multilane Free-flow refers at toll station there is no track isolation facility, toll facility is erected on the portal frame of top, track, by the mode of radio communication, complete charge transaction with the vehicle carried electronic label of installing on the vehicle that misses the stop, vehicle can be according to the normal speed of a motor vehicle (0-160km/h), (comprise by track, He Bian track, standdle carrier road) and pass through toll station in any way.A gordian technique difficult problem in multilane Free-flow E-payment system is, owing to there being the vehicle of not installing or illegally install vehicle carried electronic label, except the vehicle of normal mounting electronic tag is carried out automatic charging, also require illegal vehicle can carry out on-the-spot automatic identification evidence obtaining.At present, this is still needs further research, perfect technical barrier in multilane Free-flow electronic charging application.
Summary of the invention
For solving above-mentioned technical barrier, order of the present invention is to propose a kind of multilane Free-flow electronic toll method based on exact position coupling, by the exact matching to vehicle detection and vehicle carried electronic label positioning result, realize the automatic discrimination to normal car and illegal vehicle.
For achieving the above object, the present invention is by the following technical solutions:
Based on a multilane Free-flow electronic toll method for exact position coupling, it is characterized in that: the method comprises the following steps:
Step 1: obtain vehicle carried electronic label position, vehicle location and vehicle image, carry out electric non-stop toll transaction:
Bus or train route communication and electronic tag positioning subsystem are launched periodic downgoing signal by a read-write day alignment area of charge, communicate with the vehicle carried electronic label in area of charge, and positioning antenna receives the upward signal that vehicle carried electronic label returns,
If enter on the vehicle of communication zone vehicle carried electronic label be not installed, reading and writing antenna cannot communicate with vehicle carried electronic label, the upward signal that the vehicle carried electronic label that positioning antenna also cannot detect returns, bus or train route communication and electronic tag positioning subsystem are without this vehicle process charge station information
If enter on the vehicle of communication zone vehicle carried electronic label be installed, vehicle carried electronic label is waken up by downgoing signal, return to upward signal, bus or train route communication and electronic tag positioning subsystem are received after upward signal, and the legitimacy of vehicle carried electronic label is verified:
If vehicle carried electronic label is legal vehicle carried electronic label, read and write antenna and continue to communicate with vehicle carried electronic label, complete charge transaction,
If vehicle carried electronic label is illegal vehicle carried electronic label, read and write antenna and no longer communicate with vehicle carried electronic label, charge Fail Transaction,
No matter whether vehicle carried electronic label is legal, positioning antenna all detects the intensity of the upward signal that vehicle carried electronic label returns, bus or train route communication and electronic tag positioning subsystem are according to this uplink signal strength, orient vehicle carried electronic label position, then, bus or train route communication and electronic tag positioning subsystem are exported to track logic coordinating control system positioning time by charge transaction results, vehicle carried electronic label positioning result, vehicle carried electronic label
In above-mentioned bus or train route communication and the work of electronic tag positioning subsystem, whether vehicle detection and positioning subsystem detect has vehicle to enter surveyed area, when there being vehicle to enter after surveyed area, vehicle detection and positioning subsystem detect vehicle location immediately, automatically generate car number, and capture enabling signal to the output of track logic coordinating control system, capture enabling signal and comprise vehicle location, detection time and car number, then, vehicle detection and positioning subsystem detect contour of the vehicle profile, and automatically divide type of vehicle according to contour of the vehicle profile, then, vehicle detection and positioning subsystem by vehicle information and with this car corresponding car number export to track logic coordinating control system,
Track logic coordinating control system passes to video capture and car plate recognition subsystem by candid photograph enabling signal, video capture and car plate recognition subsystem carry out vehicle image candid photograph according to the video camera of relevant position on the vehicle position information triggering portal frame of capturing in enabling signal, the driving board of going forward side by side is identified automatically, then video capture and car plate recognition subsystem by candid photograph image, license plate recognition result and with this car corresponding car number export to track logic coordinating control system;
Track logic coordinating control system is received after the candid photograph enabling signal that vehicle detection and positioning subsystem provide at every turn, all in vehicle information database, open up a storage unit, for store car, detect the candid photograph image exported with car number, vehicle location, detection time, vehicle information and video capture and the car plate recognition subsystem of positioning subsystem output, license plate recognition result, corresponding car number with it
In the logic coordinating control system of track, be also provided with vehicle carried electronic label information database, for storing charge transaction results, vehicle carried electronic label positioning result, the vehicle carried electronic label positioning time of bus or train route communication and electronic tag positioning subsystem output,
Step 2: by exact position, mate, pick out legal car and illegal car,
The vehicle location that vehicle carried electronic label position bus or train route communication being detected with electronic tag positioning subsystem by track logic coordinating control system and vehicle detection detect with positioning subsystem mates:
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem in set distance range with bus or train route, and vehicle carried electronic label is legal vehicle carried electronic label, think that this vehicle is legal vehicle
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem in set distance range with bus or train route, but vehicle carried electronic label is illegal vehicle carried electronic label, think that this vehicle is the vehicle that electronic tag is illegally installed
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem not in set distance range with bus or train route, or only has vehicle location and without vehicle carried electronic label position, think that this vehicle is the vehicle that vehicle carried electronic label is not installed
Step 3: back-end data processing,
Track logic coordinating control system is by position matching result, and electric non-stop toll transaction results, vehicle image are captured with license plate recognition result and be uploaded to back-end data disposal system, carry out subsequent treatment.
Described same time scope refers to that the time interval is within 100 milliseconds, and described same area scope refers to that radius distance is within 0.5 meter.
The equipment adopting for enforcement said method comprises: bus or train route communication and electronic tag positioning subsystem, vehicle detection and positioning subsystem, vehicle image are captured and car plate recognition subsystem, track logic coordinating control system,
Bus or train route communication system and electronic tag positioning subsystem are by reading and writing antenna, positioning antenna and antenna controller, antenna controller internal configurations has control module, data processing unit and power detecting unit, the upward signal that control module is received for resolving read-write antenna and positioning antenna, the upward signal of receiving for read-write antenna, control module is processed according to Dedicated Short Range Communications, (DSRC) agreement, and return to downgoing signal, complete, downlink data link connects and exchanges data, the upward signal of receiving for positioning antenna, control module is given power detecting unit and is carried out signal strength detection, and by signal strength detection result, detection time, positioning antenna numbering flows to data processing unit, by data processing unit, different positioning antennas are carried out to position calculation to same vehicle carried electronic label (identification code is identical) in same sense cycle,
Vehicle detection and positioning subsystem consist of wagon detector, vehicle detection is by Laser emission receiver, detection controller composition, Laser emission receiver is round-the-clock Emission Lasers pulsating wave earthward, form laser curtain wall, and ground or vehicle are reflected to laser pulse ripple send into the photoelectric conversion unit detecting in controller, through photoelectric conversion unit, convert electric signal to, while not having vehicle to enter surveyed area, the laser pulse ripple that Laser emission receiver receives is all returned by ground return, when there being vehicle to enter surveyed area, during through laser beam curtain wall, vehicle front enters, in this period of time that rear end is left, ground return is different with the energy of the laser pulse ripple of vehicle reflection, detect controller by analyzing the energy variation of laser pulse ripple, calculate the length of vehicle, highly, width coordinate, obtain contour of the vehicle profile, and automatically divide type of vehicle according to contour of the vehicle profile, vehicle detection and positioning subsystem are responsible for the vehicle through toll station to detect, and automatically vehicle is carried out to vehicle classification,
Video capture and car plate recognition subsystem consist of high-definition camera and snapshot controller during process, snapshot controller during process disposes graphics processing unit and optical character identification unit, can complete current vehicle, comprise that license plate carries out video capture, and automatically identify the number-plate number
Track logic coordinating control system consists of driveway controller and vehicle carried electronic label information database, vehicle information database, driveway controller disposes server time calibration, track logic coordinating control system is responsible for collection, is processed the input message of above-mentioned correlation subsystem, and this system this be responsible for the duty of above each subsystem to monitor.
Realizing the required hardware system of this method comprises: bus or train route communication and electronic tag positioning subsystem, vehicle detection and positioning subsystem, video capture and car plate recognition subsystem, track logic coordinating control system etc.
Above-mentioned each system is arranged on the portal frame of toll station road top, does not take the travel space of vehicle on road; This toll station can under free transport condition by this website and be provided with through the vehicle of the vehicle carried electronic label of legal registration and implement exactly collecting of way leave charge; By the exact matching to vehicle detection and vehicle carried electronic label positioning result, realize the automatic discrimination to illegal vehicle, and then the illegal vehicle by this website is carried out to vehicle and license plate video capture, automatically extract license plate number information simultaneously; This toll station can be connected to background computer charge system by network, and above-mentioned data can be transferred to background system, thereby completes whole road toll process.
Innovation of the present invention is:
Adopt multiple positioning antennas to receive the upward signal that vehicle carried electronic label returns, according to the intensitometer of upward signal, calculate the position coordinates of vehicle carried electronic label,
Adopt wagon detector to detect vehicle traffic information, no matter whether vehicle is provided with vehicle carried electronic label, as long as vehicle is through toll station, the traffic information of vehicle, vehicle through the arrival of toll station, leave, the information such as vehicle and position all can detect by wagon detector.
The information of vehicles being detected by wagon detector triggers video capture and car plate recognition subsystem is captured vehicle and license plate picture.
The traffic information of above-mentioned vehicle, the positional information of vehicle carried electronic label, electronic charging Transaction Information, and the picture of capturing and car plate identifying information etc., all submit to track logic coordinating control system, by the position to vehicle carried electronic label and vehicle location, mate, the differentiation of realization to normal vehicle and illegal vehicle, and then realize normal vehicle is carried out to electronic charging, illegal vehicle is carried out to violation enforcement and toll recovery.
The present invention's tool compared with traditional electronic toll method has the following advantages:
In the present invention, the system equipment of toll station is arranged on the portal frame of road top, and the facility of the unrestricted vehicle pass-through in road surface, as railing, toll island etc.Charge inspection operation is carried out automatically, without manually on duty.Vehicle has free passage at toll station place, travels and there is no difference with ordinary road.Therefore its traffic capacity is identical with Ordinary Rd, is much higher than the traffic capacity of traditional toll station, can solve the crowded queuing problem of the electronic charging website appearance of bicycle road pattern, can also economize the land resource, and reduces relevant civil engineering costs.
The system that realizes this method is comprised of multiple subsystems: bus or train route communication and electronic tag positioning subsystem, vehicle detection and positioning subsystem, video capture and car plate recognition subsystem, track logic coordinating subsystem and back-end data processing subsystem.
Core of the present invention is electronic tag location technology, by multiple positioning antennas, at diverse location, receive the upward signal that vehicle carried electronic label returns, according to information such as the intensity of signal, calculate the position at vehicle carried electronic label place, and the vehicle location detecting with wagon detector mates, realize the differentiation to normal vehicle and illegal vehicle.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of one embodiment of the invention.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the vertical view of Fig. 1.
Fig. 4 is the installation site schematic diagram of video camera.
Fig. 5 is label signal intensity matching schematic diagram.
Fig. 6 is label signal intensity matching schematic diagram.
Fig. 7 is hardware composition structural drawing.
Fig. 8 is the positioning result figure of vehicle location.
Fig. 9 is the positioning result figure of vehicle carried electronic label.
Figure 10 is the match map of vehicle location and vehicle carried electronic label.
Embodiment
1, device layout situation
Number in the figure
V1 automobile V2 automobile V3 automobile V4 automobile V5 automobile
1 road surface 2 portal frame 3 portal frames
4 control box 5 control box 6 control box 7 trackside racks
M1, M2, M3 read and write antenna
A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12 positioning antenna
L1, L2, L3 Laser emission receiver
C1, C2, C3, C4, C5 video camera B left side edge
The present invention is a kind of multilane Free-flow electronic toll method based on exact position coupling.This method does not arrange the road toll facility that forms current obstacle in the path space of vehicle pass-through, but the state that vehicle can be sentenced Free-flow at toll station travels, toll station only need to arrange forward and backward portal frame 2,3 above road surface 1, at forward and backward portal frame 2,3, antenna, Laser emission receiver, the high-definition camera of implementing the required use of this method is installed.
The antenna controller of above-mentioned bus or train route communication and electronic tag positioning subsystem can be arranged in control box 4, the detection controller of vehicle detection and positioning subsystem can be arranged on the snapshot controller during process of video capture and car plate recognition subsystem in control box 5 and be arranged in control box 6, control box 4, 5 are arranged on the front portal frame 2 of toll station, control box 6 is arranged on the back gantry 3 of toll station, the driveway controller of track logic coordinating control system can be arranged in trackside rack 7, portal frame 2, 3 clear height are greater than 5.5 meters, to avoid the vehicle that road pavement is current to cause obstacle.
8 meters, forward and backward portal frame interval, the communication zone of read-write antenna and vehicle carried electronic label is 4 meters, center (or its forward position) is consistent with wagon detector.
2, systemic-function
(1) bus or train route communication and electronic tag positioning subsystem function
Bus or train route communication and electronic tag positioning subsystem consist of antenna controller, read-write antenna, positioning antenna.Positioning antenna and read-write antenna can all be contained on front-seat portal frame, also can all be arranged on rear row's portal frame, but its radiation area position can be adjusted by setting angle (angle of declination) and emissive power, make communication zone basic identical, take positioning antenna and read-write antenna, be all arranged on front-seat portal frame below and describe as example.
Antenna controller is connected with the read-write antenna M1, M2, M3 and positioning antenna A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, the A12 that are arranged on front-seat portal frame 2.The quantity of read-write antenna M1, M2, M3 is corresponding one by one with track quantity.Antenna controller can consist of industrial computer, also can adopt embedded technology, and antenna controller function is embedded to read-write antenna itself.
This system, based on Dedicated Short Range Communications, (DSRC) agreement, can be carried out the communication between road, car, completes the exchanges data of charge transaction by read-write antenna M1, M2, M3 and vehicle carried electronic label; Meanwhile, this system also possesses vehicle carried electronic label accurate positioning function.On system realizes, also have another mode: system consists of emitting antenna and receiving antenna, the transmitting work that emitting antenna is only transacted business, receiving antenna is outside the reception work of transacting business, and the double uplink signal strength that does detects and OBU location.
The quantity of emitting antenna is three, identical with track quantity, and the quantity of receiving antenna is 12,
(2) vehicle detection and positioning subsystem function:
Vehicle detection and positioning subsystem consist of Laser emission receiver and detection controller.Detecting controller is connected with Laser emission receiver L1, L2, L3.Detecting controller can consist of industrial computer, also can adopt embedded technology, and antenna controller function is embedded to Laser emission receiver itself.
The scope covering due to Laser emission receiver L1, L2, L3 has certain limit, in order to realize whole road section vehicle detection, need to lay many Laser emission receivers according to road width, is generally a track and lays a Laser emission receiver.In the present embodiment, there are three tracks, therefore need to lay 3 Laser emission receivers; 3 Laser emission receiver L1, L2, L3 be always in continuous working, and the laser beam of three Laser emission receiver L1, L2, L3 transmitting forms curtain wall one, across on three tracks.If there is vehicle passing detection region, in this period of time that vehicle front enters, rear end is left, vehicle detection and positioning subsystem detect the length of vehicle, highly, width coordinate, and automatically divide type of vehicle according to contour of the vehicle profile.
Vehicle detection and positioning subsystem are responsible for detecting in toll station track exist (also can detect the arrival of vehicle and leave) of vehicle, and provide vehicle real-time positional information, and detected vehicle is carried out to automatic vehicle type categorizing.
(3) video capture and car plate recognition subsystem function
Video capture and car plate recognition subsystem mainly carry out the operations such as video capture and car plate identification.Video capture and car plate recognition subsystem consist of high-definition camera and snapshot controller during process,
Snapshot controller during process can consist of industrial computer, also can adopt embedded technology, and snapshot controller during process function is embedded to high-definition camera itself.Snapshot controller during process is provided with image processing software and character recognition software.
The vehicle position information being provided according to vehicle detection and positioning subsystem by track logic coordinating control system is captured triggering, is responsible for illegal current vehicle to carry out video capture identification car plate automatically.Candid photograph equipment adopts high-definition camera, and the image after candid photograph is processed and character recognition (OCR) technology through image, obtains the information such as car plate color and number.Image or video capture time, track logic coordinating control system received that the vehicle input signal that vehicle detection and positioning subsystem detect triggers video capture and the candid photograph of car plate recognition subsystem at once by track logic coordinating control system control.The video camera that video capture and car plate recognition subsystem trigger relevant position according to vehicle location is captured vehicle image, and carries out the identification of automatic vehicle board.Near during candid photograph, vehicle is positioned under front-seat portal frame.Video capture and car plate recognition subsystem are uploaded to track logic coordinating control system by the vehicle image of candid photograph, license plate recognition result and car number.
(4) track logic coordinating control system function
Track logic coordinating control system consists of driveway controller, vehicle carried electronic label database and vehicle information database, driveway controller consists of industrial computer, driveway controller is responsible for collection, is processed the input message of above-mentioned related system, to complete on-the-spot charge process of exchange, transaction results can arrive background computer charge system by Internet Transmission.Meanwhile, logic coordinating control system in track is responsible for monitoring to above each subsystem work state and the information storage of various results.
3, gordian technique principle
(1) electronic tag location technology principle
Vehicle detection and positioning subsystem have had ripe product, and the vehicle detection technology adopting is known technology.But the accurate location of vehicle carried electronic label there is no mature technology, therefore key of the present invention is to solve vehicle carried electronic label orientation problem.
In the present invention, the positioning principle of vehicle carried electronic label is as follows:
At the equidistant at certain intervals laying vehicle carried electronic label of toll station section positioning antenna, the uplink signal strength returning for receiving vehicle carried electronic label.Analyze theoretically, the positioning antenna nearer apart from vehicle carried electronic label, the signal intensity of its vehicle carried electronic label receiving stronger (this is mainly determined by factors such as the relative position between directional pattern, positioning antenna and the electronic tag of the directional pattern of positioning antenna, electronic label antenna and distances); Otherwise the signal intensity receiving is more weak, even do not receive signal.Enough close if positioning antenna is laid, the signal strength detection value of each point be take apart from the nearest positioning antenna of vehicle carried electronic label as crest, the change curve progressively successively decreasing to both sides.And the positioning antenna of equidistant laying some detects vehicle carried electronic label signal intensity, the detected value discrete point that is equivalent to choose at a certain distance on curve, by curve fitting algorithm, can calculate peak of curve position, be vehicle carried electronic label position.
According to researching and analysing, the vehicle carried electronic label signal intensity that positioning antenna detects and the position of positioning antenna can be approximated to be quafric curve and are related to y=f (x
2).The intersection point of portal frame 2 being installed take sideline, leftmost side B and positioning antenna is as true origin, take positioning antenna apart from the distance of left side edge line as X-axis, the label signal intensity detecting take positioning antenna, as Y-axis, is set up coordinate system (as shown in Figure 5, Figure 6), supposes y=a
0x
2+ a
1x+a
2.In actual location process, each detection conventionally has 4-6 positioning antenna and vehicle carried electronic label signal intensity detected, according to least square method, can simulate curve, provides the parameter a of quafric curve
0, a
1, a
2, and then calculate the horizontal ordinate of the peak value of curve, be vehicle carried electronic label position.
Positioning antenna laying interval is less, and the precision of location is higher, but the construction cost of system is also higher; Otherwise positioning antenna laying interval is larger, positioning precision is lower, and system Construction cost is lower.Checking by experiment, positioning antenna is laid interval below 1.2 meters, and positioning precision just can meet system requirements, considers positioning precision and economic factors, and the laying interval of positioning antenna is in 0.5-1.2 rice scope.
In the present embodiment, at the three vehicle line toll websites (3.75 meters of lane widths, 11.25 meters of total section spans) of standard, positioning antenna is laid and is spaced apart 1 meter, lays altogether 12 positioning antennas.The intersection point of portal frame 2 being installed take sideline, leftmost side B and positioning antenna is as true origin, wherein first positioning antenna A1 is arranged on true origin place, second to the 12 positioning antenna A2, A3, A4, A5, A6, A7, A8, A9, A10 successively locating distance true origin at 1 meter, 2 meters, 3 meters, 4 meters, 5 meters, 6 meters, 7 meters, 8 meters, 9 meters, 10 meters, 11 meters;
The time of primary electron non-parking charge transaction is conventionally in 50 milliseconds, comprise repeatedly the data transmission of upward signal and downgoing signal, positioning antenna, when vehicle carried electronic label sends upstream data, detects the intensity of upward signal, thus the positional information of electron gain label.Each positioning antenna detects the moment strict conformance of same OBU uplink signal strength.
Receive after OBU upstream data at every turn, the control module of positioning antenna all can record testing result, in a transaction cycle of OBU and antenna, conventionally can receive the repeatedly upstream data of same vehicle carried electronic label, for the upward signal of same vehicle carried electronic label, the present invention only uses upward signal and positioning result thereof that OBU detected for the first time.
Because positioning antenna has multiple, across on whole road surface, at synchronization, the intensity of upward signal is sampled again, so, these positioning antennas may be received the upward signal of different vehicle carried electronic labels, run into this situation, the control module of positioning antenna is distinguished different vehicle carried electronic labels with the MAC Address in upward signal; Control module by the MAC Address of uplink signal strength, vehicle carried electronic label, detection time these 3 parameters flow to data processing unit, data processing unit calculates the testing result of same vehicle carried electronic label in the same detection moment each positioning antenna, as an example of vehicle carried electronic label OBU4 example, describes:
(2) bus or train route communication and electronic tag positioning subsystem principle of work
When the vehicle of vehicle carried electronic label is installed, enter after area of charge, read-write antenna can wake vehicle carried electronic label up, reads the identity information in vehicle carried electronic label, carries out label legitimate verification.Legal label if, reads and writes antenna and vehicle carried electronic label and carries out ETC charge transaction; Illegal label if, reads and writes antenna and does not carry out ETC charge transaction with vehicle carried electronic label.
The antenna detection that all can be positioned legal vehicle carried electronic label and illegal vehicle carried electronic label arrives, and according to vehicle carried electronic label signal intensity, calculate vehicle carried electronic label position, but the bus or train route communication module in bus or train route communication and electronic tag positioning subsystem is only carried out ETC charge transaction with the vehicle carried electronic label of legal registration, so the vehicle carried electronic label transaction results of registering legal is success, and illegal vehicle carried electronic label transaction results is unsuccessfully.
The time that read-write antenna and vehicle carried electronic label communicate is about 50ms, during this period, positioning antenna has detected the signal intensity of vehicle carried electronic label, and be transferred to antenna controller, antenna controller calculates the position of vehicle carried electronic label, and exist side by side soon transaction results and the positioning result of this car are exported to track logic coordinating control system.
(3) vehicle detection and positioning subsystem principle of work
Vehicle detection and positioning subsystem can adopt the technology such as laser curtain wall, video detection, echelette to realize.At this, adopt laser curtain wall scheme to be described.
When vehicle detection and positioning subsystem (laser curtain wall system) pass through laser beam curtain wall to vehicle, the time of folded light beam is added up.Vehicle detection and positioning subsystem consist of Laser emission receiver and detection controller, and generating laser is the round-the-clock Emission Lasers pulsating wave of direction earthward, and carries out rapid scanning along the transversal section in track, forms laser curtain wall.Laser pickoff receives ground or vehicle reflects laser pulse ripple, flows to the photoelectric conversion unit detecting in controller, through photoelectric conversion unit, converts electric signal to.While not having vehicle to enter surveyed area, the laser pulse ripple that laser pickoff receives is all returned by ground return; When there being vehicle to enter surveyed area, during through laser beam curtain wall, in this period of time that vehicle front enters, rear end is left, ground return is different with the energy of the laser of vehicle reflection.Detect controller photosignal is carried out to filtering, amplification, analog-to-digital conversion process, again by high-speed digital signal processor (DSP), digitized photosignal is carried out to Fourier transform, the information of time domain is converted to the information of frequency domain, by the information of frequency domain is carried out to energy spectrum analysis, can calculate the length of vehicle, highly, width, obtain contour of the vehicle profile, and automatically divide type of vehicle according to contour of the vehicle profile, this process is known mature technology, therefore no longer repeated.
Because the judgement of vehicle is than the late 1-2 of vehicle location testing result second, consider the requirement of real-time that vehicle image is captured, so vehicle detection and positioning subsystem are when detecting that vehicle arrives, when namely vehicle has just started to pass through laser curtain wall, immediately for this vehicle generates a car number.This car number is unique in system, for this vehicle of system identification, then in 10 milliseconds, the car number of the vehicle location detecting, detection time and generation is transferred to track logic coordinating control system as capturing enabling signal, and time delay 1-2 is transferred to track logic coordinating control system by the vehicle of vehicle and the car number corresponding with this car after second again.
(4) video capture and car plate recognition subsystem principle of work
Video capture and car plate recognition subsystem are responsible for illegal current vehicle (comprising license plate) to carry out video capture.Because the illegal car of system identification needs certain hour, if captured after identifying illegal car, vehicle has sailed out of area of charge again, and the technical solution that the present invention proposes is:
To capturing through all vehicles of toll station, wait after track logic coordinating control system picks out legal vehicle and illegal vehicle, for legal car, will capture result deletion, for illegal car, export candid photograph result.
Distance between forward and backward portal frame 2,3 is 8 meters, and Laser emission receiver is arranged on front-seat portal frame 2, and high-definition camera is arranged on rear row's portal frame 3.When vehicle has just started to pass through laser curtain wall, then in 10 milliseconds, to the output of track logic coordinating control system, capture enabling signal, track logic coordinating control system is received and is captured after enabling signal, in 2 milliseconds, to video capture and car plate recognition subsystem, export the position of vehicle on track, video capture and car plate recognition subsystem start the high-definition camera of relevant position the mobile object (vehicle) entering in focusing range are captured, in 8ms, complete the freeze frame of being captured vehicle, so the response time of whole system is 20ms, within this time period, vehicle is to pass through toll station with freestream conditions (60-80 kilometer approximately per hour), as an example of 72 kilometers of average speed per hours example, calculate, one minute 1.2 kilometers, one 20 meters of seconds, one millisecond 0.02 meter, so within the response time of 20ms, the vehicle 0.4 meter of left and right of having advanced, just in time be positioned under front-seat portal frame 2, in focusing range in high-definition camera.
Vehicle is 120 kilometers per hour by the Maximum speed limit of toll station, even calculate by this speed, within the response time of 20ms, vehicle is also in the focusing range in high-definition camera.Near this focusing range is positioned under front-seat portal frame 2.
The visual field maximum of a high-definition camera candid photograph can cover approximately 5 meters of scopes, and common vehicle width is no more than 2 meters, in order to guarantee that vehicle can accurately be captured, and captures in image-region and only has a car, and 5 video camera C1 need to be installed, C2, C3, C4, C5, every video camera C1, C2, C3, C4, C5 installation position is respectively 1.87 meters, 3.75, 5.62 rice, 7.5 rice, 9.37 meters, every video camera C1, C2, C3, C4, the candid photograph visual field of C5 is 4 meters, as shown in Figure 4, according to vehicle location, according to vehicle center position distribution at D1, D2, D3, D4, which district in D5 district, by appointed area video camera, be responsible for candid photograph, wherein region division is according to the result of vehicle detection and positioning subsystem location, according to vehicle location, trigger the candid photograph equipment (video camera) of correspondence position and capture, captured rear video capture and car plate recognition subsystem output candid photograph car number, capture image and license plate number, wherein car number is mated with positioning result for same car for capturing result.
(5) track logic coordinating control system principle of work
Track logic coordinating control system is multilane Free-flow charging method control hinge of the present invention, and the responsible input message of collecting, processing above-mentioned related system, to complete on-the-spot charge process of exchange.Transaction results can arrive background computer charge system by Internet Transmission.The key of its operation is the differentiation of the illegal car of the exact matching based on vehicle location and vehicle carried electronic label position.
Due in the exact matching process of vehicle carried electronic label location and vehicle location, time match is also important parameter, is therefore necessary to carry out the clock synchronous work between track logic coordinating control system and each subsystem.Its principle is as follows: default every 2 hours, carry out once to time work, system to time adopt Network Time Protocol to carry out, driveway controller in the logic coordinating control system of track is as NTP device server, by each subsystem to track logic coordinating control system tranmitting data register synchronization request, driveway controller respond each subsystem to time request.
The method of discrimination of illegal car.For by the vehicle of toll station, vehicle detection and positioning subsystem can detect the existence of vehicle exactly, and provide accurate location and the detection time of each car.Bus or train route communication and electronic tag positioning subsystem by with vehicle carried electronic label interactive information, can orient vehicle carried electronic label position, and provide positioning time.Exact matching by track logic coordinating control system to vehicle carried electronic label position and vehicle location in same time scope and regional extent, for having vehicle carried electronic label position to match with vehicle location and the vehicle of Transaction Success is legal vehicle; Otherwise, only has vehicle location and the vehicle that can match without vehicle carried electronic label position, or have vehicle location and electronic tag position to match, but Fail Transaction is illegal vehicle.
Vehicle location and vehicle carried electronic label position matching principle.The coupling of vehicle location and tag location result is responsible for by track logic coordinating control system, the vehicle location that the vehicle carried electronic label position that track logic coordinating control system comparison bus or train route communication and electronic tag positioning subsystem detect and vehicle detection and positioning system detect, by exact matching, pick out legal car and illegal car.
Due to vehicle detection and tag location result by different systems vehicle by time detect, understand some difference the detection time of same its vehicle detection of car and tag location, tag location and the vehicle location result of same car of same reason also have different, consider the feature of real system operation, can not there is at short notice two cars to occur in same position, therefore both detection times poor (< 0.1s) within the specific limits, the difference of detection position is (0.5 meter of <) within the specific limits, be coupling for same car.
Embodiment:
In the present embodiment, on road surface 1, there are three tracks, have five automobile V1, V2, V3, V4, V5 to pass through toll station in the mode of freely exercising.
The present invention is a kind of multilane Free-flow electronic toll method based on exact position coupling, and the method comprises the following steps:
Step 1:
Obtain vehicle carried electronic label position, vehicle location and vehicle image, carry out electric non-stop toll transaction:
Bus or train route communication and electronic tag positioning subsystem are launched periodic downgoing signal by read-write antenna M1, M2, M3 to area of charge, communicate with the vehicle carried electronic label in area of charge, positioning antenna A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12 receive vehicle carried electronic label signal.
If enter on the vehicle of communication zone vehicle carried electronic label be not installed, do not have upward signal and return.That is, read-write antenna M1, M2, M3 cannot communicate with vehicle carried electronic label, positioning antenna A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12 also cannot detect the upward signal that vehicle carried electronic label returns, and bus or train route communication and electronic tag positioning subsystem are without this vehicle process toll station information.
If enter on the vehicle of communication zone vehicle carried electronic label be installed, vehicle carried electronic label is called out hangover by downgoing signal, return to upward signal, and received by read-write antenna M1, M2, M3, bus or train route communication and electronic tag positioning subsystem are received after upward signal, and the legitimacy of vehicle carried electronic label is verified:
If vehicle carried electronic label is legal vehicle carried electronic label, read and write antenna M1, M2, M3 continuation and vehicle carried electronic label and communicate, being successfully completed charge transaction;
If vehicle carried electronic label is illegal vehicle carried electronic label, read and write antenna M1, M2, M3 no longer communicates with vehicle carried electronic label, charge Fail Transaction.
No matter whether vehicle carried electronic label is legal, and positioning antenna A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12 detect the intensity of the upward signal that vehicle carried electronic label returns.Bus or train route communication according to the intensity of upward signal, is oriented vehicle carried electronic label position with electronic tag positioning subsystem.
In the present embodiment, on road surface 1, have five cars, wherein on vehicle V2, V3, V4, V5, be separately installed with vehicle carried electronic label OUB2, OBU3, OUB4, OUB5, vehicle V1 does not install vehicle carried electronic label, these five cars pass through toll station successively, the uplink signal strength that each vehicle carried electronic label detected successively of 12 positioning antennas, its detected value as shown in Table 2.
Form 2:
The intensity of the upward signal that bus or train route communication and electronic tag positioning subsystem return according to this vehicle carried electronic label, orients vehicle carried electronic label position.Take vehicle carried electronic label OBU4 as example, calculate vehicle carried electronic label position below.Only positioning antenna A3, A4, A5, A6, A7 detect that the uplink signal strength that the vehicle carried electronic label OBU4 of vehicle V4 returns is designated as Y3, Y4, Y5, Y6, Y7, be respectively 62,142,206,200,113, other positioning antennas do not detect the uplink signal strength that vehicle carried electronic label OBU4 returns, the coordinate system of setting up according to Fig. 5, above-mentioned positioning antenna position X coordinate components is counted X3, X4, X5, X6, X7, be respectively 2 meters, 3 meters, 4 meters, 5 meters, 6 meters, above-mentioned data can represent with form 3.
Form 3: positioning antenna detects data coordinates the results list
As previously described, the vehicle carried electronic label signal intensity that positioning antenna detects and the position of positioning antenna can be approximated to be quafric curve relation, and the mathematic(al) representation of this quafric curve is:
Y=a
0x
2+ a
1x+a
2(formula one)
Wherein Y is the signal intensity of the vehicle carried electronic label OBU4 that measures of positioning antenna,
X is the X coordinate of this positioning antenna, a
0, a
1, a
2for coefficient to be solved,
For calculating a
0, a
1, a
2, bring form 3 data into formula one,
Can obtain system of equations
62＝a
02
2+a
12+a
2
142＝a
03
2+a
13+a
2
206＝a
04
2+a
14+a
2
200＝a
05
2+a
15+a
2
113＝a
06
2+a
16+a
2
Arrangement is
Wherein,
According to least square method, solve and can obtain [a
0, a
1, a
2]=[-28.8571,246.8571 ,-323.4000], the result of matching is y=-28.8571x
2+ 246.8571x-323.4000; The peak value horizontal ordinate of curve is x=-a
1/ (2*a
0)=4.28,
The position of vehicle carried electronic label OBU4 is 4.28 meters.
Adopt and use the same method, the vehicle carried electronic label positioning result of all the other each cars also can calculate, and positioning result is as shown in form 4.
Form 4:
| Vehicle carried electronic label numbering | The position that vehicle carried electronic label occurs | Positioning time |
| Vehicle carried electronic label XA | 4.28 rice | 09:00:00 001 |
| Vehicle carried electronic label XB | 4.97 rice | 09:00:00 518 |
| Vehicle carried electronic label XC | 7.86 rice | 09:00:01 076 |
| Vehicle carried electronic label XD | 9.17 rice | 09:00:00 073 |
Bus or train route communication and electronic tag positioning subsystem are exported to track logic coordinating control system by charge transaction results, vehicle carried electronic label positioning result, vehicle carried electronic label positioning time, by track logic coordinating control system, are stored in vehicle carried electronic label information database.
Data in vehicle carried electronic label information database as shown in Table 5.
Form 5:
In above-mentioned bus or train route communication and the work of electronic tag positioning subsystem, whether vehicle detection and positioning subsystem are detected and are had vehicle to enter surveyed area by Laser emission receiver.When there being vehicle to enter after surveyed area, encounter after the laser curtain wall of Laser emission receiver transmitting, vehicle detection and positioning subsystem detect immediately vehicle location, generate car number, detection time, and capture enabling signal to the output of track logic coordinating control system, capture enabling signal and comprise vehicle position information, detection time and car number, in the present embodiment, capture enabling signal and have five, as shown in Table 6.
Form 6:
Then, vehicle detection and positioning subsystem detect the length of vehicle, highly, width, obtain contour of the vehicle profile, and automatically divide type of vehicle according to contour of the vehicle profile.Then, vehicle detection and positioning subsystem by vehicle information and with this car corresponding car number export to track logic coordinating control system, the content of output as shown in Table 7:
Form 7:
| Car number | Vehicle |
| Z1 | Large-scale |
| Z2 | Medium-sized |
| Z3 | Small-sized |
| Z4 | Small-sized |
| Z5 | Small-sized |
Track logic coordinating control system passes to video capture and car plate recognition subsystem by candid photograph enabling signal, video capture and car plate recognition subsystem carry out vehicle image candid photograph according to the video camera of relevant position on the vehicle position information triggering portal frame of capturing in enabling signal, the driving board of going forward side by side is identified automatically, then video capture and car plate recognition subsystem by candid photograph image, license plate recognition result and with it corresponding car number export to track logic coordinating control system; Output content as shown in Table 8:
Form 8:
Track logic coordinating control system is received after the candid photograph enabling signal that vehicle detection and positioning subsystem provide at every turn, all in vehicle information database, open up a storage unit, for store car, detect the candid photograph image exported with car number, vehicle location, detection time, vehicle information and video capture and the car plate recognition subsystem of positioning subsystem output, license plate recognition result and corresponding car number with it
The content of storing in vehicle information database is as shown in Table 9:
Form 9:
Step 2: by exact position, mate, pick out legal car and illegal car,
The vehicle location that vehicle carried electronic label position bus or train route communication being detected with electronic tag positioning subsystem by track logic coordinating control system and vehicle detection detect with positioning subsystem mates:
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem in set distance range with bus or train route, and vehicle carried electronic label is legal vehicle carried electronic label, think that this vehicle is legal vehicle;
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem in set distance range with bus or train route, but vehicle carried electronic label is illegal vehicle carried electronic label, think that this vehicle is the vehicle that electronic tag is illegally installed;
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem not in set distance range with bus or train route,
Or only have vehicle location and without vehicle carried electronic label position, think that this vehicle is the vehicle that vehicle carried electronic label is not installed.
The time period of setting refers to that the difference of vehicle carried electronic label positioning time and vehicle location positioning time is within 100 milliseconds, and set distance range refers to that the difference of the position of vehicle carried electronic label and the position of vehicle carried electronic label is within 0.5 meter.Relatively form 5, form 9 are known,
For vehicle V1, within 592 ± 100 milliseconds of time periods of 09:00:00, do not have vehicle carried electronic label can match with vehicle location time 09:00:00 592 positioning time, within the scope of 1.5 meters ± 0.5 meter, only have 1.5 meters of vehicle locations and can match with it without vehicle carried electronic label position, illustrate that vehicle V1 has passed through toll station, but this vehicle is not installed vehicle carried electronic label, so vehicle V1 is illegal vehicle;
For vehicle V2, within 558 ± 100 milliseconds of time periods of 09:00:00, have to match with vehicle location time 09:00:00 518 positioning time of vehicle carried electronic label XB, in 5.05 meters ± 0.5 meter distance range, have 4.97 meters of vehicle carried electronic label XB positions to match with 5.05 meters of vehicle locations, but transaction results is unsuccessfully, illustrates that vehicle V2 has passed through toll station, but this vehicle is not installed the vehicle carried electronic label of legal registration, so vehicle V2 is illegal vehicle;
For vehicle V3, within 103 ± 100 milliseconds of time periods of 09:00:00, there is 09:00:00073 positioning time of vehicle carried electronic label XD to match with vehicle location time 09:00:00103, in 9.2 meters ± 0.5 meter distance range, have 9.17 meters of vehicle carried electronic label XC positions to match with 9.20 meters of vehicle locations, and transaction results is successfully, illustrates that vehicle V3 has passed through toll station, and this vehicle is provided with the vehicle carried electronic label of legal registration, so vehicle V3 is legal vehicle;
For vehicle V4, within 031 ± 100 millisecond of time period of 09:00:00, there is 09:00:00 positioning time of vehicle carried electronic label XA 001 can match with this vehicle location time 09:00:00 031, in 4.15 meters ± 0.5 meter distance range, there are 4.28 meters of vehicle carried electronic label XA positions to match with 4.15 meters of vehicle locations, illustrate that vehicle V4 has passed through toll station, and this vehicle is provided with the vehicle carried electronic label of legal registration, and transaction results is successfully, so vehicle V4 is legal vehicle;
For vehicle V5, within 094 ± 100 millisecond of time period of 09:00:01, there is 09:00:01 positioning time of vehicle carried electronic label XC 076 can match with this vehicle location time 09:00:01 094, in 7.75 meters ± 0.5 meter distance range, there are 7.86 meters of the positions of vehicle carried electronic label XC to match with 7.75 meters of vehicle locations, illustrate that vehicle V5 has passed through toll station, and this vehicle is provided with the vehicle carried electronic label of legal registration, and transaction results is successfully, so vehicle V5 is legal vehicle;
Above-mentioned matching process is as shown in Fig. 8, Fig. 9, Figure 10, Fig. 8 is the positioning result figure of vehicle location, Fig. 9 is the positioning result figure of vehicle carried electronic label, Figure 10 is the matching result figure of vehicle location and vehicle carried electronic label, comparison diagram 8, Fig. 9 are known, process vehicle location mates with vehicle carried electronic label, and the vehicle that car number is Z1 is not installed vehicle carried electronic label.
Step 3: back-end data processing,
Track logic coordinating control system is by position matching result, and electric non-stop toll transaction results, vehicle image are captured with license plate recognition result and be uploaded to back-end data disposal system, carry out subsequent treatment.Because vehicle V3, V4, V5 are legal vehicle, back-end data disposal system is deleted the candid photograph picture of vehicle V3, V4, V5, the photo of illegal vehicle V1, V2, number-plate number information are stored together with the car record of breaking rules and regulations, as the foundation of recovery toll simultaneously.
Claims (3)
1. the multilane Free-flow electronic toll method based on exact position coupling, is characterized in that: the method comprises the following steps:
Step 1: obtain vehicle carried electronic label position, vehicle location and vehicle image, carry out electric non-stop toll transaction:
Bus or train route communication and electronic tag positioning subsystem are launched periodic downgoing signal by a read-write day alignment area of charge, communicate with the vehicle carried electronic label in area of charge, and positioning antenna receives the upward signal that vehicle carried electronic label returns,
If enter on the vehicle of communication zone vehicle carried electronic label be not installed, reading and writing antenna cannot communicate with vehicle carried electronic label, the upward signal that the vehicle carried electronic label that positioning antenna also cannot detect returns, bus or train route communication and electronic tag positioning subsystem are without this vehicle process charge station information
If enter on the vehicle of communication zone vehicle carried electronic label be installed, vehicle carried electronic label is waken up by downgoing signal, return to upward signal, bus or train route communication and electronic tag positioning subsystem are received after upward signal, and the legitimacy of vehicle carried electronic label is verified:
If vehicle carried electronic label is legal vehicle carried electronic label, read and write antenna and continue to communicate with vehicle carried electronic label, complete charge transaction,
If vehicle carried electronic label is illegal vehicle carried electronic label, read and write antenna and no longer communicate with vehicle carried electronic label, charge Fail Transaction,
No matter whether vehicle carried electronic label is legal, positioning antenna all detects the intensity of the upward signal that vehicle carried electronic label returns, bus or train route communication and electronic tag positioning subsystem are according to this uplink signal strength, orient vehicle carried electronic label position, then, bus or train route communication and electronic tag positioning subsystem are exported to track logic coordinating control system positioning time by charge transaction results, vehicle carried electronic label positioning result, vehicle carried electronic label
In above-mentioned bus or train route communication and the work of electronic tag positioning subsystem, whether vehicle detection and positioning subsystem detect has vehicle to enter surveyed area, when there being vehicle to enter after surveyed area, vehicle detection and positioning subsystem detect vehicle location immediately, automatically generate car number, and capture enabling signal to the output of track logic coordinating control system, capture enabling signal and comprise vehicle location, detection time and car number, then, vehicle detection and positioning subsystem detect contour of the vehicle profile, and automatically divide type of vehicle according to contour of the vehicle profile, then, vehicle detection and positioning subsystem by vehicle information and with this car corresponding car number export to track logic coordinating control system,
Track logic coordinating control system passes to video capture and car plate recognition subsystem by candid photograph enabling signal, video capture and car plate recognition subsystem carry out vehicle image candid photograph according to the video camera of relevant position on the vehicle position information triggering portal frame of capturing in enabling signal, the driving board of going forward side by side is identified automatically, then video capture and car plate recognition subsystem by candid photograph image, license plate recognition result and with this car corresponding car number export to track logic coordinating control system;
Track logic coordinating control system is received after the candid photograph enabling signal that vehicle detection and positioning subsystem provide at every turn, all in vehicle information database, open up a storage unit, for store car, detect the candid photograph image exported with car number, vehicle location, detection time, vehicle information and video capture and the car plate recognition subsystem of positioning subsystem output, license plate recognition result, corresponding car number with it
In the logic coordinating control system of track, be also provided with vehicle carried electronic label information database, for storing charge transaction results, vehicle carried electronic label positioning result, the vehicle carried electronic label positioning time of bus or train route communication and electronic tag positioning subsystem output;
Step 2: by exact position, mate, pick out legal car and illegal car,
The vehicle location that vehicle carried electronic label position bus or train route communication being detected with electronic tag positioning subsystem by track logic coordinating control system and vehicle detection detect with positioning subsystem mates:
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem in set distance range with bus or train route, and vehicle carried electronic label is legal vehicle carried electronic label, think that this vehicle is legal vehicle
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem in set distance range with bus or train route, but vehicle carried electronic label is illegal vehicle carried electronic label, think that this vehicle is the vehicle that electronic tag is illegally installed
If within the time period of setting, the vehicle location that vehicle detection detects with positioning subsystem is communicated by letter the vehicle carried electronic label position that detects with electronic tag positioning subsystem not in set distance range with bus or train route, or only has vehicle location and without vehicle carried electronic label position, think that this vehicle is the vehicle that vehicle carried electronic label is not installed
Step 3: back-end data processing,
Track logic coordinating control system is by position matching result, and electric non-stop toll transaction results, vehicle image are captured with license plate recognition result and be uploaded to back-end data disposal system, carry out subsequent treatment.
2. the multilane Free-flow electronic toll method based on exact position coupling as claimed in claim 1, is characterized in that: the time period of described setting refers to that the time interval is within 100 milliseconds, and described set distance range refers to that radius distance is within 0.5 meter.
3. the equipment adopting for the method implementing the claims described in 1, it is characterized in that: described equipment comprises: bus or train route communication and electronic tag positioning subsystem, vehicle detection and positioning subsystem, video capture and car plate recognition subsystem, track logic coordinating control system
Bus or train route communication and electronic tag positioning subsystem are by reading and writing antenna, positioning antenna and antenna controller form, antenna controller internal configurations has control module, data processing unit and power detecting unit, the upward signal that control module is received for resolving read-write antenna and positioning antenna, the upward signal of receiving for read-write antenna, control module is processed according to dedicated short-range communication, and return to downgoing signal, complete, downlink data link connects and exchanges data, the upward signal of receiving for positioning antenna, control module is given power detecting unit and is carried out signal strength detection, and by signal strength detection result, detection time, positioning antenna numbering flows to data processing unit, by data processing unit, different positioning antennas are carried out to position calculation to same vehicle carried electronic label in same sense cycle,
Vehicle detection and positioning subsystem consist of wagon detector, wagon detector is by Laser emission receiver, detection controller composition, Laser emission receiver is round-the-clock Emission Lasers pulsating wave earthward, form laser curtain wall, and ground or vehicle are reflected to laser pulse ripple send into the photoelectric conversion unit detecting in controller, through photoelectric conversion unit, convert electric signal to, while not having vehicle to enter surveyed area, the laser pulse ripple that Laser emission receiver receives is all returned by ground return, when there being vehicle to enter surveyed area, during through laser beam curtain wall, vehicle front enters, in this period of time that rear end is left, ground return is different with the energy of the laser pulse ripple of vehicle reflection, detect controller by analyzing the energy variation of laser pulse ripple, calculate the length of vehicle, highly, width coordinate, obtain contour of the vehicle profile, and automatically divide type of vehicle according to contour of the vehicle profile, vehicle detection and positioning subsystem are responsible for the vehicle through toll station to detect, and automatically vehicle is carried out to vehicle classification,
Video capture and car plate recognition subsystem consist of high-definition camera and snapshot controller during process, snapshot controller during process disposes graphics processing unit and optical character identification unit, can complete current vehicle, comprise that license plate carries out video capture, and automatically identify the number-plate number
Track logic coordinating control system consists of driveway controller and vehicle carried electronic label information database, vehicle information database, driveway controller disposes server time calibration, track logic coordinating control system is responsible for collection, is processed the input message of above-mentioned correlation subsystem, and this system is responsible for the duty of above each subsystem to monitor.
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