CN115376310A - Highway vehicle detection device and method based on portal system - Google Patents
Highway vehicle detection device and method based on portal system Download PDFInfo
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- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
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Abstract
Compared with the traditional vehicle detection device, the portal detection system, the optical fiber data acquisition system and the laser ranging system provided by the invention are mutually fused and supplemented, so that the functional defects of the traditional vehicle detection device are overcome, and the vehicle detection data are further improved. In addition, the highway vehicle detection device provided by the invention collects vehicle speed data and wheel base data in multiple occasions, and the data collected in the multiple occasions are mutually calibrated, so that the accuracy and the reliability of the collected data are improved.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a device and a method for detecting vehicles on a highway based on a portal system.
Background
In recent years, with the rapid development of economy in China, the construction pace of highways is continuously accelerated, the number of motor vehicles and drivers in China is rapidly increased, the management work of the highways is increasingly heavy and complex, and new problems and challenges need to be continuously faced, wherein vehicle information acquisition is an important branch field, which is a foundation for perfecting traffic intellectualization and informatization, and accurate acquisition of vehicle data is a precondition for safe traffic implementation. Through the smooth development of national cancellation provincial toll station construction projects, an ETC portal system is completely installed on an operating highway in China, the system is built on the section along the highway and is arranged in a free flow mode, the ETC portal system is composed of upper and lower bidirectional portals, the upper and lower bidirectional portals are arranged in a staggered mode in the opposite direction, and the ETC portal system is a special system and supporting facilities with functions of toll segmented charging, license plate image recognition and the like, and is wide in coverage area and convenient to power supply, install and communication access.
At present, in the field of intelligent traffic, the vehicle detection technology is rapidly developed, wherein a microwave vehicle detector and a video vehicle detector are mainly applied to a highway, wherein the microwave vehicle detector is mostly arranged on a ramp at an entrance and an exit of a toll station and an interchange, the measurement parameters mainly comprise traffic flow and vehicle speed, the number of acquisition points is small, the acquired information is incomplete, and the information cannot correspond to the specific vehicle information; the video vehicle detection can collect information such as license plates, traffic flow and vehicle speed, but the detection precision is relatively low, the information such as vehicle types and vehicle weights cannot be accurately collected, only access data can be used, high requirements are required for operators, the identification and confirmation cannot be carried out in the driving process, and the hidden dangers such as omission and misjudgment exist.
Disclosure of Invention
In order to solve the limitations and defects of the prior art, the invention provides a portal system-based highway vehicle detection device, which comprises a portal detection system, an optical fiber data acquisition system, a laser ranging system, an optical transceiver, an optical fiber link, a data switch, a storage server and a highway vehicle detection system, wherein the portal detection system is used for detecting vehicles on the highway;
the portal detection system is set based on an original ETC portal system and comprises a high-definition license plate recognition system and a microwave vehicle detector, the high-definition license plate recognition system is used for recognizing and locking vehicles passing through the ETC portal and synchronously triggering the tracking action of the portal detection system, and the microwave vehicle detector is used for detecting the speed and marking the attributes of the locked vehicles;
the optical fiber data acquisition system is arranged in a range of 5 meters in front of and behind the ETC portal and is used for acquiring vehicle speed data and vehicle weight data in a 3-data acquisition area, and the optical fiber data acquisition system and the portal detection system are used for carrying out attribute marking on a locked vehicle;
the laser ranging system is arranged by depending on the ETC portal and comprises 3 sections of laser arrays, the laser ranging system is used for acquiring vehicle length data, vehicle width data, vehicle height data and wheel base data, and the laser ranging system, the portal detection system and the optical fiber data acquisition system are used for carrying out attribute marking on a locked vehicle;
the data switch is used for calculating, analyzing and integrating data acquired by each portal detection system according to the time trigger points and restoring a dynamic track of the vehicle in the detection area;
the storage server is used for storing the acquired data, and storing the real-time data in a targeted manner according to the preset accuracy of the acquired data and the identification event type;
the road vehicle detection system is used for carrying out real-time intelligent monitoring and analysis on acquired data, and carrying out early warning and timely disposal on abnormal operation conditions of vehicles.
Optionally, the high-definition license plate recognition system and the microwave vehicle detector in the portal detection system are used for marking and continuously tracking a vehicle entering a detection area, and measuring the vehicle running speed so that the detection data and the detection target are correspondingly consistent;
the optical fiber data acquisition system is used for acquiring strain data of corresponding different time points by using 3 data acquisition areas with special structures consisting of optical fiber gratings, and calculating the speed, the weight and the wheelbase of a vehicle passing through the ETC portal frame;
the laser ranging system is used for rapidly scanning a vehicle passing through the ETC portal frame by using 3 sections of laser arrays to obtain vehicle length data, vehicle width data and vehicle height data of the vehicle;
the optical transceiver, the optical fiber link and the data switch are used for transmitting and analyzing the acquired data;
the storage server is used for storing the detection data and carrying out correction and fault-tolerant calculation on the obtained detection data;
the highway vehicle detection system is used for displaying and carrying out model analysis and calculation on vehicle information passing through the ETC portal and road sections thereof, providing basic data for road section bearing and providing technical support for road section operation service evaluation.
The invention also provides a highway vehicle detection method based on the portal system, which uses the highway vehicle detection device and comprises the following steps:
the portal detection system is provided with an independent detection thread for each vehicle, and when the vehicle enters the detection range of the portal detection system, the detection thread is T 1 Triggering the microwave vehicle detector of the portal detection system at any moment, and establishing a vehicle detection thread P by the microwave vehicle detector of the portal detection system 1 Starting to drive the vehicleThe speed is measured in a row mode, a high-definition license plate recognition system of the portal frame detection system is started at the same time, a picture is taken for license plate recognition, and recognized vehicles are locked;
when the vehicle passes through an information acquisition area in front of a portal system of the optical fiber data acquisition system, T is the time 2 At the moment, the optical fiber data acquisition system acquires optical fiber data, synchronously triggers a high-definition license plate recognition system of the portal frame detection system, and takes a picture to recognize a license plate so that the recognized license plate corresponds to a locked vehicle;
when a vehicle enters an information acquisition area below a portal system of the optical fiber data acquisition system, T is the time 3 At the moment, the optical fiber data acquisition system acquires optical fiber data, the laser ranging system is triggered synchronously, and the laser ranging system starts to acquire vehicle model data;
when the vehicle leaves the information acquisition area below the portal system of the optical fiber data acquisition system, T is the time 4 At the moment, the optical fiber data acquisition system acquires vehicle type data of a vehicle and synchronously closes the laser ranging system;
when the vehicle passes through the information acquisition area behind the portal system of the optical fiber data acquisition system, T is the time 5 At the moment, the optical fiber data acquisition system acquires optical fiber data, synchronously triggers a high-definition license plate recognition system of the portal frame detection system, and takes a picture to recognize a license plate so that the recognized license plate corresponds to a locked vehicle;
acquiring vehicle speed data, vehicle weight data and wheel base data of a vehicle according to data acquired by the optical fiber data acquisition system in the 3-block data acquisition area and corresponding acquisition time points;
when the vehicle leaves the highway vehicle detection device, the collected image information, license plate information, vehicle speed information and vehicle type information are stored in a vehicle detection record R 1 The vehicle detection thread P 1 And (6) ending.
Optionally, the method further includes: the vehicle and the running state thereof are self-corrected by the acquired detection data.
The invention has the following beneficial effects:
compared with the traditional vehicle detection device, the portal detection system, the optical fiber data acquisition system and the laser ranging system provided by the invention are mutually fused and supplemented, so that the functional defects of the traditional vehicle detection device are overcome, and the vehicle detection data are further improved. In addition, the highway vehicle detection device provided by the invention collects the vehicle speed data and the wheel base data on multiple occasions, and the data collected on the multiple occasions are mutually calibrated, so that the accuracy and the reliability of the collected data are improved.
Drawings
Fig. 1 is a block diagram of a highway vehicle detection device based on a portal system according to an embodiment of the present invention.
Fig. 2 is a layout diagram of a device of a highway vehicle detection apparatus based on a portal system according to an embodiment of the present invention.
Fig. 3a is a schematic structural diagram of a data acquisition area A1 according to an embodiment of the present invention.
Fig. 3b is a schematic structural diagram of a data acquisition area A2 according to an embodiment of the present invention.
Fig. 4a is a schematic structural diagram of a data acquisition area A3 according to an embodiment of the present invention.
Fig. 4b is an exemplary diagram of a data acquisition area A3 according to an embodiment of the present invention.
Fig. 5a is a schematic structural diagram of a laser array B1 and a laser array B2 of a laser ranging system according to an embodiment of the present invention.
Fig. 5B is a schematic structural diagram of a laser array B3 of a laser ranging system according to an embodiment of the present invention.
Wherein the reference numerals are: m1, M2 are ETC portal, A1, A2, A3 are the data acquisition region of optical data acquisition system, B1, B2, B3 are the laser array of laser ranging system, C1 is microwave vehicle detector, C2-C5 are high definition license plate recognition system, D is ETC portal intelligent control cabinet, L 1 -L 5 For data transmission fibres, L 6 、L 7 For sensing lightAnd L is the width of the road surface, and F1-F (n + 3) is a fiber grating sensor.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the highway vehicle detection device based on the portal system and the method thereof in detail with reference to the attached drawings.
Example one
The embodiment provides a highway vehicle detection device based on a portal system, which is characterized in that the portal detection system, an optical fiber data acquisition system and a laser ranging system are combined with each other, and physical indexes and real-time data such as license plate, speed, weight, length, width, height and wheelbase of a vehicle passing through an ETC portal can be obtained by acquiring real-time data and calculating and analyzing the vehicle, so that data support is provided for further realizing highway free flow charging and operation.
Fig. 1 is a block diagram of a highway vehicle detection device based on a portal system according to an embodiment of the present invention. As shown in fig. 1, the whole device mainly comprises a portal detection system, an optical fiber data acquisition system, a laser ranging system, an optical transmitter and receiver, an optical fiber link, a data switch, a storage server and a road vehicle detection system.
Portal detecting system in FIG 1 mainly arranges based on original ETC portal system, including high definition license plate recognition system and microwave vehicle detector, wherein high definition license plate recognition system discerns, locks the vehicle through ETC portal detection device, triggers the procedure of pursuing in step to carry out speed of a motor vehicle and detect and attribute mark to the locking vehicle through microwave vehicle detector.
The optical fiber data acquisition system in the graph 1 is mainly arranged in the range of 5 meters around the ETC portal, 3 optical fiber data acquisition areas are utilized, the accurate acquisition of physical indexes of the speed and the weight of a vehicle is realized, and the optical fiber data acquisition system is linked with a portal detection system to perform attribute marking on a locked vehicle.
The laser ranging system in the figure 1 is mainly laid by depending on an ETC portal and comprises 3 sections of laser arrays, so that the physical information of vehicles such as vehicle length, vehicle width, vehicle height, wheel base and the like can be acquired, and the laser ranging system is linked with a portal detection system and an optical fiber data acquisition system to perform attribute marking on a locked vehicle.
Fig. 1 shows an optical transceiver and a transmission fiber, which are mainly used for transmitting collected information; in fig. 1, the data switch calculates, analyzes and integrates data collected by each detection system mainly through a time trigger point, and restores a dynamic trajectory of a vehicle in a detection area with high precision; the storage server in fig. 1 is mainly used for storing a large amount of detection data, and performing targeted storage on a large amount of real-time data through the acquisition precision and the event type identification set by the system; the road vehicle detection system in fig. 1 mainly carries out real-time intelligent monitoring and analysis on collected vehicle information, and carries out early warning and disposal on abnormal operation conditions.
Fig. 2 is a layout diagram of a device of a highway vehicle detection apparatus based on a portal system according to an embodiment of the present invention. Wherein, M1, M2 are ETC portal, A1, A2, A3 are 3 optic fibre data acquisition regions among the optic fibre data acquisition system, B1, B2, B3 are 3 sections of laser array among the laser ranging system, C1 is the microwave vehicle detector among the portal detecting system, C2-C5 are high definition license plate recognition system among the portal detecting system, D is ETC portal intelligent control cabinet, L 1 -L 5 For data-carrying fibre-sensing fibres, L 6 、L 7 Is a sensing optical fiber.
In FIG. 2, M1 and M2 are ETC gantries, and the two upward and downward gantries are arranged in a back-to-back staggered manner; in fig. 2, A1, A2, and A3 are 3 optical fiber data acquisition regions in the optical fiber data acquisition system, and before use, a standard vehicle is used to calibrate the acquisition system (for multiple vehicle types and multiple vehicle weights), and a calibration map is drawn. A1 and A2 are double-channel staggered structure strain acquisition devices composed of fiber gratings, and A3 is a double-channel array structure strain acquisition device composed of fiber gratings. When the vehicle passes A1 (T) 2 Time of day), A3 leading edge (T) 3 Time), A3 trailing edge (T) 4 Time), A2 (T) 5 Time) and strain values are generated at corresponding positions, wherein the distances among the front edges of A1 and A3, the rear edges of A3 and A2 are fixed values, and the speed of each section of vehicle can be calculated according to multiple groups of time differences and solvedOn average, the vehicle running speed V can be achieved A (ii) a When the vehicle passes through the array areas A1, A2 and A3, the vehicle weight and the wheel base of the vehicle can be obtained by utilizing the generated strain value information, the position information and the generated time and according to the calibration mapping chart.
In fig. 2, B1, B2, and B3 are 3-segment laser arrays in the laser ranging system, wherein B1 and B2 are arranged on both sides of the ETC portal frame, B3 is arranged on the top of the ETC portal frame, and when a vehicle enters the A3 region (T) 3 Moment), a laser ranging system is triggered, high-frequency measurement (ms level) is started by 3 sections of laser arrays, when a vehicle does not enter or drive away from the cross section of the portal, the ranging values are fixed values, the measurement results of B1 and B2 are the road width L, and the measurement result of B3 is the height H of the portal. When a vehicle passes through the lane, the speed V and the speed L obtained by the optical fiber data acquisition system B1 、L B2 、L B3 Three real-time laser ranging values can obtain the three-dimensional shape scanning structure (vehicle width, vehicle height and wheel base) of the passing vehicle.
In fig. 2, C1 is a microwave vehicle detector in the portal detection system, which mainly starts a vehicle detection program for a vehicle that has just entered a detection area and measures the speed; C2-C5 are high-definition license plate recognition systems in the portal detection system, and are mainly used for capturing and recognizing license plates of all collected data nodes in the whole detection area driving process of vehicles, so that the collected data are ensured to correspond to the detected vehicles.
Fig. 2D is an ETC portal intelligent control cabinet, which mainly includes an optical fiber sensing demodulation system, a data switch, a low-voltage power distribution facility, and an optical transceiver, and mainly transmits field-collected data to a loop segment monitoring center through an optical communication network; l is 1 -L 5 The intelligent control cabinet is a data transmission optical fiber and mainly transmits data acquired by the portal detection system, the optical fiber data acquisition system and the laser ranging system back to the intelligent control cabinet; l is 6 、L 7 The connection of the acquisition areas A1 and A2 is mainly realized for the sensing optical fiber.
Fig. 3a is a schematic structural diagram of a data acquisition area A1 according to a first embodiment of the present invention, and fig. 3b is a schematic structural diagram of a data acquisition area A2 according to a first embodiment of the present invention. Wherein L is 1 、L 2 For data transmission optical fibres，L 6 、L 7 For the sensing fiber, L is the road surface width, F1-F (n + 3) is the fiber grating sensor (FBG), and the layout mode is as shown in FIG. 3a and FIG. 3b.
The fiber grating sensors of F1-F (n + 3) in the structure A1 in FIG. 3a have the same central wavelength with the same up-down position, A1 passes through L 6 、L 7 Connected to A2, with a lateral FBG center point spacing of 0.1m.
The fiber grating sensors of F1-F (n + 3) in the A2 structure in FIG. 3b have the same center wavelength and are positioned vertically, A2 passes through L 6 、L 7 Connected to A1, with transverse FBG center points spaced 0.1m apart, looped back at F (n + 2) and F (n + 3) such that L 1 、L 2 The optical fibers are communicated.
When a vehicle passes through the detection devices A1 and A2, the single-tire contact point at least acts on the 4-position acquisition grating, and the speed and the weight of the passing vehicle can be obtained by comparing and analyzing the acquired strain value, position information and time information with a calibration mapping chart.
Optical fiber sensing acquisition system pair L 1 、L 2 The two channels carry out staggered acquisition, the fiber grating sensors with consistent positions and equal central wavelengths distinguish acquired information through data return time, and the system acquisition precision can be improved and the data fault tolerance performance can be improved through the special arrangement of the grating structure and the two-channel staggered acquisition mode.
Fig. 4a is a schematic structural diagram of a data acquisition area A3 according to a first embodiment of the present invention, and fig. 4b is an exemplary diagram of the data acquisition area A3 according to the first embodiment of the present invention. Wherein L is the width of the road surface, L 3 、L 4 Is a data transmission fiber.
In fig. 4a, the area A3 has a length of 10m, and the internal portion is a 12 × 12 fiber grating layout array, which is divided into two channels to connect with the fiber sensing demodulation system. When the length of the vehicle wheel base is less than 10m, the vehicle passes through the detection device A3, all tires can contact the fiber bragg grating acquisition matrix, and the vehicle wheel base L0 can be directly obtained; and the single tire contact point can act on 4 acquisition gratings, and the speed and the weight of the passing vehicle can be obtained by contrasting and analyzing the acquired strain value, position information and time information with a calibration mapping chart.
When the length of the vehicle wheel base is greater than 10m, taking the situation of fig. 4b as an example, the vehicle driving distance from the front wheel of the vehicle to the detection device A3 to the rear wheel of the vehicle to the detection device A3 is L0+10, and the vehicle wheel base L0 can be obtained by using the data acquisition time difference and the vehicle driving speed; in the process of passing the vehicle, the single tire contact point at least acts on 4 acquisition gratings, and the speed and the weight of the passing vehicle can be obtained by comparing and analyzing the acquired strain value, position information and time information with a calibration mapping chart.
Fig. 5a is a schematic structural diagram of a laser array B1 and a laser array B2 of a laser ranging system according to a first embodiment of the present disclosure, and fig. 5B is a schematic structural diagram of a laser array B3 of a laser ranging system according to a first embodiment of the present disclosure. In fig. 5a, the array B1 and the array B2 have the same structure, the height of the array B1 is equal to that of an ETC portal H (6.5 m), the length of the array B3 is the width L of a road surface, high-precision laser ranging points (T1-Tn) are arranged in the laser array every 0.5m, and 9 common laser ranging points (T11-T19) are distributed between every two adjacent high-precision laser ranging points (T1 and T2).
When passing the leading edge (T) of the optical fiber acquisition system A3 by a vehicle 3 Moment), the laser ranging system is triggered to carry out high-frequency measurement (ms level), and in the scanning process, when the real-time data of two high-precision laser ranging points of the B1 and B2 arrays and the common laser ranging point in the middle of the two high-precision laser ranging points are all H, the acquisition of the ranging interval is stopped in the next acquisition period.
The embodiment provides a highway vehicle detection device based on portal system, compares traditional vehicle detection device, and portal detecting system, optic fibre data acquisition system, the mutual complementation that fuses of laser range finding system that this embodiment provided have compensatied the not enough of traditional vehicle detection device function, have further perfected vehicle detection data. In addition, the highway vehicle detection device provided by the embodiment collects vehicle speed data and wheel base data on multiple occasions, and the data collected on the multiple occasions are mutually calibrated, so that the accuracy and the reliability of the collected data are improved.
Example two
The embodiment provides a highway vehicle detection method based on a portal system, which uses the highway vehicle detection device provided by the embodiment one and mainly comprises a portal detection system, an optical fiber data acquisition system, a laser ranging system, an optical transmitter and receiver, an optical fiber link, a data exchange, a storage server and a highway vehicle detection system, wherein the portal detection system is mainly arranged based on the original ETC portal system and comprises a high-definition license plate recognition system and a microwave vehicle detector, the high-definition license plate recognition system recognizes and locks vehicles passing through the ETC portal detection device, a tracking program is synchronously triggered, and the microwave vehicle detector detects the speed of the locked vehicles and marks the attributes of the locked vehicles; the optical fiber data acquisition system is mainly arranged in the range of 5 meters in front of and behind the ETC portal, 3 optical fiber data acquisition areas are utilized to realize the accurate acquisition of physical indexes of vehicle speed and vehicle weight, and the optical fiber data acquisition system is linked with the portal detection system to mark the attributes of the locked vehicle; the laser ranging system is mainly arranged by depending on an ETC portal and consists of 3 sections of laser arrays, can realize the acquisition of vehicle physical information such as vehicle length, vehicle width, vehicle height, wheel base and the like, is linked with a portal detection system and an optical fiber data acquisition system, and carries out attribute marking on a locked vehicle; the data switch calculates, analyzes and integrates the data collected by each detection system mainly through a time trigger point, and restores the dynamic track of the vehicle in the detection area with high precision; the storage server is mainly used for storing massive detection data, and performing targeted storage on massive real-time data through the acquisition precision and the event type identification set by the system; the road vehicle detection system mainly carries out real-time intelligent monitoring and analysis on the acquired vehicle information, and carries out early warning and disposal on abnormal operation conditions in advance.
The highway vehicle detection device provided by the embodiment one consists of a portal detection system, an optical fiber data acquisition system, a laser ranging system, an optical transmitter and receiver, an optical fiber link, a data switch, a storage server and a highway vehicle detection system. Marking and continuously tracking vehicles entering a detection area through a high-definition license plate recognition system and a microwave vehicle detector in a portal detection system, and measuring the running speed of the vehicles to enable detection data to be correspondingly consistent with a detection target; the optical fiber data acquisition system mainly utilizes 3 detection areas with special structures consisting of optical fiber gratings to finish strain data acquisition of corresponding different time points, so that information of speed, vehicle weight, wheel base and the like of a passing vehicle is deduced and calculated; the laser ranging system mainly utilizes 3 sections of laser arrays to rapidly scan the vehicles passing through the portal frame, so that vehicle type data (vehicle length, vehicle width and vehicle height) of the vehicles are obtained; the optical transceiver, the optical fiber link and the data switch are mainly used for transmission and technical analysis of the acquired data; the storage server is mainly used for storing massive detection data and carrying out correction and fault-tolerant calculation on the obtained data; the highway vehicle detection system mainly displays and analyzes and calculates the vehicle information passing through the ETC portal and the road section, provides basic data for road section bearing, and provides technical support for road section operation service evaluation.
The working flow of the expressway vehicle detection method based on the portal system provided by the embodiment is as follows: the embodiment relates to the integration of multiple technologies, and the physical information and dynamic information acquisition of vehicles is completed, wherein each vehicle is an independent detection thread, and a microwave vehicle detector (T) can be triggered when a vehicle enters the detection range of a portal detection system 1 Time of day), a vehicle detection program P is established 1 Starting to measure the speed of the vehicle, starting a high-definition license plate recognition system, shooting a high-definition picture to perform license plate recognition and locking the vehicle; when the vehicle passes through the information acquisition area (T) of the first part (front of the portal system) of the optical fiber data acquisition system 2 At the moment), acquiring optical fiber data, synchronously triggering a high-definition license plate recognition system, and shooting a picture to recognize a license plate so as to enable the license plate to correspond to a locked vehicle; when the vehicle enters the information acquisition area (T) of the second part (below the portal system) of the optical fiber data acquisition system 3 Moment), collecting optical fiber data, synchronously triggering the laser ranging system, starting vehicle type data collection, and when the vehicle leaves the second part (below the portal system) of the optical fiber data collection system, collecting information collection area (T) 4 Time), synchronously closing the laser ranging system to finish vehicle type data acquisition of the vehicle; when the vehicle passes through the third part (behind the portal system) of the optical fiber data acquisition system, the information is acquiredRegion of concentration (T) 5 At that time), acquiring optical fiber data, synchronously triggering a high-definition license plate recognition system, and shooting a picture to recognize a license plate so as to enable the license plate to correspond to a locked vehicle; the collection of the speed, the weight and the wheel base of the vehicle can be finished by utilizing 3 detection area data and collection time points of the optical fiber data collection system, and after the vehicle drives away from the vehicle detection device, the collected information such as images, license plates, the speed, the type and the like are stored in a vehicle detection record R 1 Vehicle detection program P 1 And (6) ending. The vehicle and the driving state thereof can be self-corrected by detecting the data.
The embodiment provides a highway vehicle detection method based on portal system, compares traditional vehicle detection device, and portal detection system, optic fibre data acquisition system, the mutual complementation that fuses of laser range finding system that this embodiment provided have compensatied the not enough of traditional vehicle detection device function, have further perfected vehicle detection data. In addition, the highway vehicle detection device provided by the embodiment collects the vehicle speed data and the wheel base data on multiple occasions, and the data collected on the multiple occasions are mutually calibrated, so that the accuracy and the reliability of the collected data are improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (4)
1. A highway vehicle detection device based on a portal system is characterized by comprising a portal detection system, an optical fiber data acquisition system, a laser ranging system, an optical transmitter and receiver, an optical fiber link, a data switch, a storage server and a highway vehicle detection system;
the portal detection system is set based on an original ETC portal system and comprises a high-definition license plate recognition system and a microwave vehicle detector, the high-definition license plate recognition system is used for recognizing and locking vehicles passing through the ETC portal and synchronously triggering the tracking action of the portal detection system, and the microwave vehicle detector is used for detecting the speed and marking the attributes of the locked vehicles;
the optical fiber data acquisition system is arranged in a range of 5 meters in front of and behind the ETC portal and is used for acquiring vehicle speed data and vehicle weight data in a 3-data acquisition area, and the optical fiber data acquisition system and the portal detection system are used for carrying out attribute marking on a locked vehicle;
the laser ranging system is arranged by depending on the ETC portal frame and comprises 3 sections of laser arrays, the laser ranging system is used for acquiring vehicle length data, vehicle width data, vehicle height data and wheel base data, and the laser ranging system, the portal frame detection system and the optical fiber data acquisition system are used for carrying out attribute marking on a locked vehicle;
the data switch is used for calculating, analyzing and integrating data acquired by each portal detection system according to the time trigger points and restoring the dynamic track of the vehicle in the detection area;
the storage server is used for storing the acquired data, and storing the real-time data in a targeted manner according to the preset accuracy of the acquired data and the identification event type;
the road vehicle detection system is used for carrying out real-time intelligent monitoring and analysis on the acquired data, and carrying out early warning and timely disposal on the abnormal operation condition of the vehicle.
2. The portal system based highway vehicle detecting device according to claim 1, wherein a high-definition license plate recognition system and a microwave vehicle detector in the portal detecting system are used for marking and continuously tracking vehicles entering a detection area, and measuring the running speed of the vehicles so that the detection data and the detection target are correspondingly consistent;
the optical fiber data acquisition system is used for acquiring strain data of corresponding different time points by using 3 data acquisition areas with special structures consisting of optical fiber gratings, and calculating the speed, the weight and the wheelbase of a vehicle passing through the ETC portal frame;
the laser ranging system is used for rapidly scanning the vehicles passing through the ETC portal frame by using 3 sections of laser arrays to obtain vehicle length data, vehicle width data and vehicle height data of the vehicles;
the optical transceiver, the optical fiber link and the data switch are used for transmitting and analyzing the acquired data;
the storage server is used for storing the detection data and carrying out correction and fault-tolerant calculation on the obtained detection data;
the highway vehicle detection system is used for displaying and carrying out model analysis and calculation on vehicle information passing through the ETC portal and road sections thereof, providing basic data for road section bearing and providing technical support for road section operation service evaluation.
3. A method for detecting vehicles on a highway based on a portal system, wherein the method for detecting vehicles on a highway uses the device for detecting vehicles on a highway as claimed in claim 1 or claim 2, and the method for detecting vehicles on a highway comprises the following steps:
the portal detection system is provided with an independent detection thread for each vehicle, and when the vehicle enters the detection range of the portal detection system, the detection thread is T 1 Triggering the microwave vehicle detector of the portal detection system at any moment, and establishing a vehicle detection thread P by the microwave vehicle detector of the portal detection system 1 Starting to measure the speed of the vehicle, starting a high-definition license plate recognition system of the portal frame detection system, shooting a picture for license plate recognition and locking the recognized vehicle;
when the vehicle passes through an information acquisition area in front of a portal system of the optical fiber data acquisition system, T is the time 2 At the moment, the optical fiber data acquisition system acquires optical fiber data, synchronously triggers a high-definition license plate recognition system of the portal frame detection system, and takes a picture to recognize a license plate so that the recognized license plate corresponds to a locked vehicle;
information acquisition under the portal system of the fiber optic data acquisition system when a vehicle entersWhen region is collected, it is T 3 At the moment, the optical fiber data acquisition system acquires optical fiber data, the laser ranging system is triggered synchronously, and the laser ranging system starts to acquire vehicle model data;
when the vehicle leaves the information acquisition area below the portal system of the fiber optic data acquisition system, this time T 4 At the moment, the optical fiber data acquisition system acquires vehicle type data of a vehicle and synchronously closes the laser ranging system;
when the vehicle passes through the information acquisition area behind the portal system of the optical fiber data acquisition system, T is the time 5 At any moment, the optical fiber data acquisition system acquires optical fiber data, synchronously triggers a high-definition license plate recognition system of the portal frame detection system, and takes a picture to recognize a license plate so that the recognized license plate corresponds to a locked vehicle;
acquiring speed data, weight data and wheelbase data of the vehicle according to the data acquired by the optical fiber data acquisition system in the 3-block data acquisition area and the corresponding acquisition time point;
when the vehicle leaves the highway vehicle detection device, the collected image information, license plate information, vehicle speed information and vehicle type information are stored in a vehicle detection record R 1 The vehicle detection thread P 1 And (6) ending.
4. The mast system based highway vehicle detection method of claim 3, further comprising: the vehicle and the running state thereof are self-corrected by the acquired detection data.
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