CN115376310B - 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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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—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
- G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/625—License plates
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
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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 mutually complemented, so that the defect of functions of the traditional vehicle detection device is overcome, and the vehicle detection data is further perfected. In addition, the expressway vehicle detection device provided by the invention collects the vehicle speed data and the wheelbase data in multiple occasions, and the data collected in 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 portal system-based expressway vehicle detection device and a portal system-based expressway vehicle detection method.
Background
In recent years, along with the rapid development of the economy of 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 highways is increasingly heavy and complex, and new problems and challenges are continuously faced, wherein the vehicle information acquisition is an important branch field, is the basis for perfecting the intelligent and informationized traffic, and is a precondition for the implementation of safe traffic. The ETC portal system is installed on the expressway along the section construction of the expressway in China through the smooth development of the national cancellation of the construction engineering of the provincial toll station, and is arranged in a free flow mode, the ETC portal system consists of an upward bidirectional portal and a downward bidirectional portal, the upward bidirectional portal and the downward bidirectional portal are arranged in a staggered mode, and the ETC portal is a special system and a matched facility with the functions of toll segmented charging, license plate image recognition and the like, and is wide in coverage, convenient to supply power, install and communication access.
At present, in the intelligent traffic field, the development of vehicle detection technology is rapid, wherein a microwave vehicle detector and a video vehicle detector are mainly applied to a highway, the microwave vehicle detector is mostly arranged on a toll gate ramp and an interchange, the measurement parameters are mainly vehicle flow and vehicle speed, the acquisition points are few, the acquisition information is incomplete, and the vehicle detection system cannot correspond to specific vehicle information; the video vehicle detection can collect information such as license plates, traffic flow, vehicle speed and the like, but the detection accuracy is relatively low, the information such as vehicle types, vehicle weights and the like cannot be accurately collected, only access data can be used, high requirements are provided for operators, the operators cannot distinguish and confirm in the driving process, and hidden hazards such as omission, misjudgment and the like exist.
Disclosure of Invention
In order to solve the limitations and defects existing in the prior art, the invention provides a portal system-based expressway 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 the vehicles on the expressway;
the portal detection system is arranged based on an original ETC portal system, the portal detection system 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, the tracking action of the portal detection system is synchronously triggered, and the microwave vehicle detector is used for detecting the speed of the locked vehicles and marking the attributes;
the optical fiber data acquisition system is arranged in the 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 3 data acquisition areas, and the optical fiber data acquisition system and the portal detection system perform attribute marking on the locked vehicle;
the laser ranging system is arranged by depending on the ETC portal frame, the laser ranging system comprises 3 sections of laser arrays, the laser ranging system is used for collecting vehicle length data, vehicle width data, vehicle height data and wheelbase data, and the laser ranging system, the portal frame detection system and the optical fiber data acquisition system are used for marking the attribute of the locked vehicle;
the data exchanger is used for calculating, analyzing and integrating the 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 acquired data precision and the identification event type;
the road vehicle detection system is used for carrying out real-time intelligent monitoring and analysis on the collected data, and carrying out early warning and timely treatment on abnormal running conditions of the vehicle.
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 the vehicle entering the detection area, and measuring the running speed of the vehicle so that the detection data and the detection target are consistent;
the optical fiber data acquisition system is used for acquiring strain data at different corresponding time points by using 3 data acquisition areas with special structures formed by optical fiber gratings, and calculating the speed, the weight and the wheelbase of a vehicle passing through the ETC portal;
the laser ranging system is used for rapidly scanning the vehicle passing through the ETC portal by using a 3-section laser array 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 correcting and fault-tolerant calculation is carried out on the obtained detection data;
the road vehicle detection system is used for displaying and model analysis and calculation of vehicle information passing through the ETC portal frame 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 method for detecting the expressway vehicle based on the portal system, which uses the expressway vehicle detection device, and comprises the following steps:
the portal detection system is provided with independent detection threads for each vehicle, and when the vehicles drive into the detection range of the portal detection system, the detection range is T at the moment 1 At moment, triggering a microwave vehicle detector of the portal detection system, wherein the microwave vehicle detector of the portal detection system establishes a vehicle detection thread P 1 Starting to measure the speed of the vehicle, starting a high-definition license plate recognition system of the portal detection system, taking a picture to recognize the license plate, and locking the recognized vehicle;
when the vehicle passes through the information acquisition area in front of the portal system of the optical fiber data acquisition system, the time is T 2 At moment, the optical fiber data acquisition system acquires optical fiber data and synchronously triggers a high-definition license plate recognition system of the portal detection system, and photographs are taken to recognize license plates so that the recognized license plates correspond to the locked vehicles;
when a vehicle enters an information acquisition area below a portal system of the optical fiber data acquisition system, the vehicle is T 3 At moment, the optical fiber data acquisition system acquires optical fiber data and synchronously triggers the laser ranging system, and the laser ranging system starts to acquire vehicle type data;
when the vehicle leaves the lower part of the portal system of the optical fiber data acquisition systemIn the information acquisition region of (1), at this time, T 4 At moment, the optical fiber data acquisition system acquires the vehicle type data of the vehicle, and the laser ranging system is synchronously closed;
when the vehicle passes through the information acquisition area behind the portal system of the optical fiber data acquisition system, the information acquisition area is T 5 At moment, the optical fiber data acquisition system acquires optical fiber data and synchronously triggers a high-definition license plate recognition system of the portal detection system, and photographs are taken to recognize license plates so that the recognized license plates correspond to the locked vehicles;
acquiring speed data, weight data and wheelbase data of a vehicle according to the data acquired by the optical fiber data acquisition system in the 3 data acquisition areas and corresponding acquisition time points;
after the vehicle leaves the expressway 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 (5) ending.
Optionally, the method further comprises: and carrying out self-correction on the vehicle and the running state of the vehicle through the obtained 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 are mutually fused and mutually complemented, so that the defect of functions of the traditional vehicle detection device is overcome, and the vehicle detection data is further perfected. In addition, the expressway vehicle detection device provided by the invention collects the vehicle speed data and the wheelbase data in multiple occasions, and the data collected in 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 portal system-based highway vehicle detection apparatus according to an embodiment of the present invention.
Fig. 2 is a device layout diagram of an expressway vehicle detection device based on a portal system according to an embodiment of the invention.
Fig. 3a is a schematic structural diagram of a data acquisition area A1 according to an embodiment of the 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 a schematic diagram of a data acquisition area A3 according to an embodiment of the 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 invention.
Fig. 5B is a schematic structural diagram of a laser array B3 of a laser ranging system according to an embodiment of the invention.
Wherein, the reference numerals are as follows: m1 and M2 are ETC door frames, A1, A2 and A3 are data acquisition areas of an optical fiber data acquisition system, B1, B2 and B3 are laser arrays of a laser ranging system, C1 is a microwave vehicle detector, C2-C5 are high-definition license plate recognition systems, D is an ETC door frame intelligent control cabinet, L 1 -L 5 For data transmission optical fibre, L 6 、L 7 The sensor is a sensing optical fiber, L is the pavement width, and F1-F (n+3) are fiber bragg grating sensors.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following describes the expressway vehicle detection device and the method thereof based on the portal system with reference to the attached drawings.
Example 1
Aiming at the problems of the existing expressway vehicle detection system, the embodiment provides an expressway vehicle detection device based on a portal system, which utilizes the portal detection system, an optical fiber data acquisition system and a laser ranging system to be combined with each other, and can obtain physical indexes such as license plates, speed, weight, length, width, height and wheelbase of vehicles and real-time data of the vehicles by carrying out real-time data acquisition, calculation and analysis on the vehicles passing through an ETC portal, thereby providing data support for further realizing free flow charging and operation of the expressway.
Fig. 1 is a block diagram of a portal system-based highway vehicle detection apparatus according to an embodiment of the present invention. As shown in figure 1, the whole device mainly 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 road vehicle detection system.
The portal frame detection system in fig. 1 is mainly arranged based on an original ETC portal frame system and comprises a high-definition license plate recognition system and a microwave vehicle detector, wherein the high-definition license plate recognition system recognizes and locks vehicles passing through the ETC portal frame detection device, synchronously triggers a tracking program, and detects the speeds of locked vehicles and marks the attributes of the locked vehicles through the microwave vehicle detector.
In fig. 1, the optical fiber data acquisition system is mainly arranged in the range of 5 meters in front of and behind the ETC portal, and utilizes 3 optical fiber data acquisition areas to realize accurate acquisition of physical indexes of vehicle speed and vehicle weight, and is linked with the portal detection system to perform attribute marking on the locked vehicle.
In the laser ranging system in fig. 1, the laser ranging system is mainly laid by relying on an ETC portal frame, and is composed of 3 sections of laser arrays, so that the acquisition of vehicle physical information such as vehicle length, vehicle width, vehicle height, wheelbase and the like can be realized, and the locking vehicles are subjected to attribute marking in linkage with a portal frame detection system and an optical fiber data acquisition system.
The optical transceiver and the transmission optical fiber in fig. 1 are mainly used for transmitting collected information; the data exchanger in fig. 1 calculates, analyzes and integrates the data collected by each detection system mainly through time trigger points, and restores the dynamic track of the vehicle in the detection area with high precision; the storage server in fig. 1 is mainly used for storing massive detection data, and is used for storing a large amount of real-time data in a targeted manner through acquisition precision and event type identification set by a system; in the road vehicle detection system in fig. 1, the collected vehicle information is monitored and analyzed intelligently in real time, and abnormal running conditions are pre-warned and treated in advance.
Fig. 2 is a device layout diagram of an expressway vehicle detection device based on a portal system according to an embodiment of the invention. Wherein M1 and M2 are ETC gatesThe frame, A1, A2, A3 are 3 optical fiber data acquisition areas in an optical fiber data acquisition system, B1, B2, B3 are 3 sections of laser arrays in a laser ranging system, C1 is a microwave vehicle detector in a portal detection system, C2-C5 are a high-definition license plate recognition system in the portal detection system, D is an ETC portal intelligent control cabinet, L 1 -L 5 Data transmission optical fiber sensing optical fiber L 6 、L 7 Is a sensing optical fiber.
In fig. 2, M1 and M2 are ETC door frames, and the upward and downward bidirectional door frames are arranged in a back staggered manner; in fig. 2, A1, A2 and A3 are 3 optical fiber data acquisition areas in the optical fiber data acquisition system, before use, standard vehicles are required to be used for calibrating the acquisition system (various vehicle types and various vehicle weights), and a calibration map is drawn. A1 and A2 are two-channel staggered structure strain acquisition devices formed by fiber gratings, and A3 is a two-channel array structure strain acquisition device formed by fiber gratings. When the vehicle passes by A1 (T 2 Time), A3 front (T 3 Time), A3 trailing edge (T 4 Time of day), A2 (T 5 Time), strain values are generated at corresponding positions, wherein the distances among the front edges A1 and A3, the rear edge A3 and the rear edge A2 are fixed values, the vehicle speed of each section can be calculated and averaged according to a plurality of groups of time differences, and the vehicle running speed V can be achieved A The method comprises the steps of carrying out a first treatment on the surface of the When the vehicle passes through the A1, A2 and A3 array areas, the generated strain value information, the generated position information and the generated time are utilized, and the vehicle weight and the vehicle wheelbase of the vehicle can be obtained according to the calibration map.
In fig. 2, B1, B2, B3 are 3-segment laser arrays in the laser ranging system, wherein B1, B2 are arranged on both sides of the ETC gantry, B3 is arranged on top of the ETC gantry, when a vehicle enters the A3 region (T 3 Moment), the laser ranging system is triggered, the 3-section laser array starts high-frequency measurement (ms level), when the vehicle does not enter and leave the section of the portal frame, the ranging values are fixed values, the measuring results of B1 and B2 are the road surface width L, and the measuring result of B3 is the portal frame height H. When a lane has a vehicle passing through, the vehicle speeds V and L are obtained by the optical fiber data acquisition system B1 、L B2 、L B3 Three real-time laser ranging values can obtain the three-dimensional 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, and 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 portal detection systems, and are mainly used for carrying out snapshot and license plate recognition on each collected data node in the whole detection area running process of the vehicle, so that collected data is ensured to correspond to 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 distribution facility, and an optical transceiver, and mainly transmits data collected on site to a loop section monitoring center through an optical communication network; l (L) 1 -L 5 The system is characterized in that the system is a data transmission optical fiber, and data acquired by a portal detection system, an optical fiber data acquisition system and a laser ranging system are mainly transmitted back to an intelligent control cabinet; l (L) 6 、L 7 For the sensing optical fiber, connection of the acquisition areas A1 and A2 is mainly realized.
Fig. 3a is a schematic structural diagram of a data acquisition area A1 according to an embodiment of the present invention, and fig. 3b is a schematic structural diagram of a data acquisition area A2 according to an embodiment of the present invention. Wherein L is 1 、L 2 For data transmission optical fibre, L 6 、L 7 For sensing optical fibers, L is the pavement width, F1-F (n+3) is an optical fiber grating sensor (FBG), and the layout mode is shown in fig. 3a and 3b.
Fiber grating sensor of F1-F (n+3) in A1 structure in FIG. 3a, with identical center wavelength in consistent upper and lower positions, A1 passes through L 6 、L 7 Is connected with A2, wherein the distance between the center points of the transverse FBGs is 0.1m.
Fiber grating sensor of F1-F (n+3) in A2 structure of FIG. 3b, with identical center wavelength and consistent upper and lower positions, A2 passes L 6 、L 7 Is connected with A1, wherein the distance between the center points of the transverse FBGs is 0.1m, and the loop back is carried out at F (n+2) and F (n+3) so that L 1 、L 2 The optical fibers are communicated.
When a vehicle passes through the detection devices A1 and A2, at least 4 positions of the single tire contact points act on the collected grating, and the speed and the weight of the passing vehicle can be obtained through comparing and analyzing the collected strain value, position information and time information with the calibration map.
Optical fiber sensing acquisition system pair L 1 、L 2 The optical fiber grating sensors with the same central wavelength and consistent positions are used for distinguishing the acquired information through the data return time, and the special grating structure and the double-channel staggered acquisition mode can improve the acquisition precision of the system and increase the fault tolerance performance of the data.
Fig. 4a is a schematic structural diagram of a data acquisition area A3 according to an embodiment of the present invention, and fig. 4b is an exemplary diagram of the data acquisition area A3 according to an embodiment of the present invention. Wherein L is the width of the road surface, L 3 、L 4 Is a data transmission optical fiber.
In fig. 4a, the area A3 has a length of 10m, and the fiber grating layout array with an interior of 12 x 12 is divided into two channels and connected with the fiber sensing demodulation system. When the vehicle wheelbase length is smaller than 10m, the vehicle passes through the detection device A3, all tires can contact the fiber bragg grating acquisition matrix, and the vehicle wheelbase L0 can be directly obtained; and 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 through comparing and analyzing the acquired strain value, position information and time information with the calibration map.
When the length of the vehicle wheelbase is greater than 10m, taking the situation of fig. 4b as an example, the vehicle wheelbase L0 can be obtained by utilizing the data acquisition time difference and the vehicle running speed from the front-most wheel of the vehicle to enter the detection device A3 to the last wheel of the vehicle to leave the detection device A3, and the vehicle running distance is L0+10; in the passing process of the vehicle, at least 4 positions of the collected grating can be acted on a single tire contact point, and the speed and the weight of the passing vehicle can be obtained through comparing and analyzing the collected strain value, position information and time information with the calibration map.
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, and 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. In FIG. 5a, the B1 and B2 arrays have the same structure, the height is identical to the height of the ETC portal, H (6.5 m), the length of B3 is the pavement width L, each 0.5m in the laser array is provided with one high-precision laser ranging point (T1-Tn), and 9 common laser ranging points (T1 and T2) are distributed among two adjacent high-precision laser ranging points.
When a vehicle passes through the front edge (T 3 Moment), namely triggering the laser ranging system to perform high-frequency measurement (ms level), and stopping the acquisition of the ranging interval in the next acquisition period when the real-time data of the two high-precision laser ranging points of the B1 and B2 arrays and the common laser ranging point in the middle are H in the scanning process.
The embodiment provides a highway vehicle detection device based on portal system, compares traditional vehicle detection device, and portal detection system, optical fiber data acquisition system, laser ranging system that this embodiment provided fuse each other and complement each other, has compensatied the not enough of traditional vehicle detection device function, has further perfected vehicle detection data. In addition, the expressway vehicle detection device provided by the embodiment collects vehicle speed data and wheelbase data in multiple occasions, the data collected in multiple occasions are mutually calibrated, and accuracy and reliability of the collected data are improved.
Example two
The expressway vehicle detection device provided by the first embodiment is mainly composed of 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 an expressway vehicle detection system, wherein the portal detection system is mainly arranged 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 recognizes and locks vehicles passing through the ETC portal detection device, synchronously triggers a tracking program and detects the speeds of the locked vehicles and marks the attributes of the locked vehicles through the microwave vehicle detector; the optical fiber data acquisition system is mainly arranged in the range of 5 meters in front of and behind the ETC portal, and utilizes 3 optical fiber data acquisition areas to realize accurate acquisition of physical indexes of vehicle speed and vehicle weight, and is linked with the portal detection system to carry out attribute marking on the locked vehicle; the laser ranging system is mainly laid by relying on an ETC portal and consists of 3 sections of laser arrays, can collect physical information of vehicles such as vehicle length, vehicle width, vehicle height, wheelbase and the like, is linked with a portal detection system and an optical fiber data collection system, and performs attribute marking on locked vehicles; the data exchanger is mainly used for calculating, analyzing and integrating the data acquired by each detection system through the time trigger points, and restoring 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 a large amount of real-time data is stored in a targeted manner through acquisition precision and identification event types set by the system; the road vehicle detection system is mainly used for carrying out real-time intelligent monitoring and analysis on collected vehicle information, and early warning and disposing abnormal running conditions in advance.
The expressway vehicle detection device provided by the first embodiment consists of 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 an expressway vehicle detection system. Marking and continuously tracking a vehicle 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 vehicle to enable detection data to be consistent with detection targets correspondingly; the optical fiber data acquisition system mainly utilizes 3 detection areas with special structures formed by optical fiber gratings to complete strain data acquisition at corresponding different time points, so that information such as speed, weight and wheelbase of a passing vehicle is deduced and calculated; the laser ranging system mainly utilizes a 3-section laser array to rapidly scan vehicles passing through a portal, so as to obtain vehicle type data (vehicle length, vehicle width and vehicle height) of the vehicles; the optical transceiver, the optical fiber link and the data switch are mainly used for transmission and technical analysis of collected data; the storage server is mainly used for storing massive detection data and correcting and fault-tolerant calculation of the obtained data; the road vehicle detection system is mainly used for displaying and model analysis and calculation of vehicle information passing through the ETC portal frame and the road section, providing basic data for road section bearing and providing technical support for road section operation service evaluation.
Highway vehicle detection based on portal system provided in this embodimentThe working flow of the method is as follows: the embodiment relates to the integration of multiple technologies to complete the acquisition of physical information and dynamic information of vehicles, wherein each vehicle is an independent detection thread, and when a vehicle enters the detection range of a portal detection system, a microwave vehicle detector (T) is triggered 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 photo to recognize the license plate and locking the vehicle; as the vehicle passes through the first portion of the fiber optic data acquisition system (in front of the portal system) information acquisition region (T 2 Moment), collecting optical fiber data, synchronously triggering a high-definition license plate recognition system, and shooting a photo recognition 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 Time), collecting optical fiber data, synchronously triggering a laser ranging system, starting vehicle type data collection, and collecting information when the vehicle leaves a second part (below a portal system) of the optical fiber data collection system (T 4 Time), synchronously closing the laser ranging system to finish the vehicle type data acquisition of the vehicle; when the vehicle passes through the third part of the optical fiber data acquisition system (behind the portal system) information acquisition area (T 5 Moment), collecting optical fiber data, synchronously triggering a high-definition license plate recognition system, and shooting a photo recognition license plate to correspond to a locked vehicle; the collection of the speed, the weight and the wheelbase of the vehicle can be completed by utilizing 3 detection area data and collection time points of the optical fiber data collection system, and after the vehicle leaves the vehicle detection device, the collected information such as images, license plates, speed, vehicle types and the like is stored in the vehicle detection record R 1 Vehicle detection program P 1 And (5) ending. The vehicle and its running state can be self-corrected by detecting the data.
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 embodiment are mutually fused and mutually complemented, so that the defect of functions of the traditional vehicle detection device is overcome, and the vehicle detection data is further perfected. In addition, the expressway vehicle detection device provided by the embodiment collects vehicle speed data and wheelbase data in multiple occasions, the data collected in multiple occasions are mutually calibrated, and accuracy and reliability of the collected data are improved.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (2)
1. The method for detecting the expressway vehicle based on the portal system is characterized in that the expressway vehicle detection method uses an expressway vehicle detection device based on the portal system;
the expressway vehicle detection device based on the portal system 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;
the portal detection system is arranged based on an original ETC portal system, the portal detection system 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, the tracking action of the portal detection system is synchronously triggered, and the microwave vehicle detector is used for detecting the speed of the locked vehicles and marking the attributes;
the optical fiber data acquisition system is arranged in the 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 3 data acquisition areas, and the optical fiber data acquisition system and the portal detection system perform attribute marking on the locked vehicle;
the laser ranging system is arranged by depending on the ETC portal frame, the laser ranging system comprises 3 sections of laser arrays, the laser ranging system is used for collecting vehicle length data, vehicle width data, vehicle height data and wheelbase data, and the laser ranging system, the portal frame detection system and the optical fiber data acquisition system are used for marking the attribute of the locked vehicle;
the data exchanger is used for calculating, analyzing and integrating the 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 acquired data precision and the identification event type;
the road vehicle detection system is used for carrying out real-time intelligent monitoring and analysis on the collected data, and carrying out early warning and timely treatment on abnormal running conditions of the vehicle;
the expressway vehicle detection method comprises the following steps:
the portal detection system is provided with independent detection threads for each vehicle, and when the vehicles drive into the detection range of the portal detection system, the detection range is T at the moment 1 At moment, triggering a microwave vehicle detector of the portal detection system, wherein the microwave vehicle detector of the portal detection system establishes a vehicle detection thread P 1 Starting to measure the speed of the vehicle, starting a high-definition license plate recognition system of the portal detection system, taking a picture to recognize the license plate, and locking the recognized vehicle;
when the vehicle passes through the information acquisition area in front of the portal system of the optical fiber data acquisition system, the time is T 2 At moment, the optical fiber data acquisition system acquires optical fiber data and synchronously triggers a high-definition license plate recognition system of the portal detection system, and photographs are taken to recognize license plates so that the recognized license plates correspond to the locked vehicles;
when a vehicle enters an information acquisition area below a portal system of the optical fiber data acquisition system, the vehicle is T 3 At moment, the optical fiber data acquisition system acquires optical fiber data and synchronously triggers the laser ranging system, and the laser ranging system starts to acquire vehicle type data;
when the vehicle leaves the information acquisition area below the portal system of the optical fiber data acquisition systemAt this time T 4 At moment, the optical fiber data acquisition system acquires the vehicle type data of the vehicle, and the laser ranging system is synchronously closed;
when the vehicle passes through the information acquisition area behind the portal system of the optical fiber data acquisition system, the information acquisition area is T 5 At moment, the optical fiber data acquisition system acquires optical fiber data and synchronously triggers a high-definition license plate recognition system of the portal detection system, and photographs are taken to recognize license plates so that the recognized license plates correspond to the locked vehicles;
acquiring speed data, weight data and wheelbase data of a vehicle according to the data acquired by the optical fiber data acquisition system in the 3 data acquisition areas and corresponding acquisition time points;
after the vehicle leaves the expressway 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 (5) ending.
2. The portal system-based highway vehicle detection method according to claim 1, further comprising: and carrying out self-correction on the vehicle and the running state of the vehicle through the obtained detection data.
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