The increasingly complex road traffic environment has prompted China's requirements for intelligent traffic management systems to be intelligent, comprehensive, accurate and real-time development. To meet this requirement, we must rely on reliable real-time and accurate detection data, including big data. Geomagnetic, video and radar detection methods provide multi-mode data, and the technical advantages of millimeter-wave radar can be extremely important applications in the field of intelligent transportation.
For example, it can be used for vehicle detection, traffic volume survey, traffic incident detection, traffic guidance, overspeed monitoring, electronic bayonet, electronic police and traffic light control.
First, the advantages of millimeter wave radar
The millimeter wave radar is a radar that operates in the millimeter wave. Usually, the millimeter wave refers to the frequency domain of 30 to 300 GHz (wavelength is 1 to 10 mm). The wavelength of the millimeter wave is between the centimeter wave and the light wave, so the millimeter wave has the advantages of both microwave guidance and photoelectric guidance.
Because the millimeter wave radar has the characteristics of small size, easy integration and high spatial resolution compared to the centimeter wave radar. Early applied to the military field, with the development and advancement of radar technology, millimeter wave radar sensors began to be used in many fields such as automotive electronics, drones, and intelligent transportation. Millimeter wave radar has the following advantages:
(1) High precision and anti-interference
Compared with the microwave seeker, the millimeter wave seeker has the characteristics of small size, light weight and high spatial resolution. In the case of the same antenna aperture, the millimeter-wave radar has a narrower beam (generally a milli-arc metric), which improves the angular resolution and angular accuracy of the radar, and is beneficial for anti-interference, clutter and multipath. Reflection interference, etc.
(2) All weather all day
Compared with optical seekers such as infrared, video and laser, the millimeter wave seeker has the ability to penetrate fog, smoke and dust, and has all-weather all-day characteristics.
(3) High resolution and multiple targets
Due to the high operating frequency, it is possible to obtain a large signal bandwidth (such as the magnitude of the GHz) and Doppler shift, which is advantageous for improving the measurement accuracy and resolution of the distance and velocity and analyzing the target detail features. At the same time, the millimeter wave radar can distinguish and identify small targets, and can recognize multiple targets at the same time, so it has strong spatial resolution and imaging capabilities.
(4) sensitive high false positives
The system has high sensitivity, low false positive rate, and is not susceptible to external electromagnetic noise.
(5) High frequency and low power
Has a higher transmission frequency and lower transmission power.
(6) Measureable speed can be measured
With FMCW frequency modulated continuous wave, the distance and speed of multiple targets can be measured at the same time, and the target can be continuously tracked, and even the stationary target can be kept tracked.
(7) The distance is far and real time is high
The measuring distance is far, reaching two-way 12 lanes and 200 meters away, and the detection frequency of 38 Hz 26 ms has strong real-time performance.
Second, 4D millimeter wave visible radar
4D millimeter wave visible radar is a multi-lane multi-target tracking 4D video radar designed for intelligent transportation systems. It uses the world's first intelligent three-dimensional space millimeter wave detection technology to provide accurate X, Y, Z three-dimensional coordinates and one. Dimensional speed 4D multi-target tracking of trajectory information in real time ensures accurate detection and statistics of various information for each vehicle.
The radar has a new type of millimeter-wave vehicle detector with completely independent intellectual property rights. It uses the principle of frequency modulation continuous wave and Doppler technology to emit millimeter waves on the road surface. By high-speed real-time digital processing analysis of echo signals, the speed and average of bicycles are detected. Non-contact traffic detectors for basic traffic flow information such as speed, traffic flow, lane occupancy, vehicle type, queue length and event analysis.
The 4D millimeter wave visible radar series integrates high-definition video cameras, which can monitor 4-12 lanes simultaneously and provide high-resolution 4D radar track information of 128 targets and simultaneously superimposed and displayed on the video. The 4D millimeter-wave visible radar's four-dimensional recognition technology enables it to accurately measure speed and track target trajectories, providing very accurate data even in high-traffic or congested sections.
Third, the application of millimeter wave radar
4D millimeter wave visible radar is mainly used for collecting and monitoring traffic parameters such as highways, urban roads and ordinary highway traffic flows, providing accurate, reliable and real-time traffic information for traffic management, and providing technical support for traffic intelligentization. It can be mainly applied in the aspects of law enforcement, management, security and integration in the field of intelligent transportation.
Law enforcement
(1) Speed ​​radar
A multi-lane multi-target tracking radar designed for speed measurement, which can be mounted in a front or a diagonal position to provide accurate vehicle speed and positioning information to ensure that every speeding car in the detection section is captured. A radar plus a high-definition camera can realize multi-lane multi-target speed measurement. At the same time, each vehicle's license plate recognition and differential speed measurement are directly superimposed on the vehicle, which is accurate and reliable, high capture rate, low cost and easy installation. The problem of single-lane speed radar and the inability of multiple cars on one picture to be used is avoided.
(Millimeter wave speed radar application photo)
(2) Electronic bayonet radar
A multi-lane multi-target tracking radar specially designed for electronic bayonet, which can automatically detect vehicles in the tracking area. When the vehicle meets the set trigger condition, the output signal triggers the HD camera to capture and collect evidence, which constitutes the front end acquisition unit of the bayonet system. .
It has multi-target recognition and tracking capability. It provides the trigger signal of the specified position and the precise vehicle speed according to the lane in the bayonet system. It can also provide traffic information such as traffic flow, average speed and occupancy rate according to the cycle. The radar performs the collected data. After the statistics, the output is directly output to the user, and no additional computer is required for calculation and statistics. Installation and commissioning is simple and convenient, the trigger position is set by parameters, and it is not necessary to repeatedly adjust the installation angle to find the trigger position.
(Millimeter wave electronic bayonet radar application photo)
(3) Electronic police radar
A multi-lane, multi-target tracking radar designed specifically for electronic police to provide accurate vehicle information and video surveillance to ensure that every illegal vehicle in the detection section is captured without destroying the road and being protected from light and weather changes. Instead of coil, geomagnetic and video detection, it simultaneously detects overspeed, retrograde, lane change, violation, accident, etc. of 128 vehicle targets in 4-12 lanes.
(Millimeter wave electronic police radar application photo)
Management aspect
(1) Flow detection radar
A multi-lane multi-target tracking radar designed specifically for electronic police, which provides accurate statistics such as traffic flow, average speed, and lane occupancy in a range of 180 meters. The flow accuracy is ≥99%, and the lane occupancy accuracy is ≥99%. The average speed accuracy is ≥99%, providing real-time road conditions photos or videos to grasp and verify the scene, providing 30ms detection update and RJ45, 485 two kinds of signal output.
(2) Intelligent intersection radar
A smart intersection radar can simultaneously detect queuing information such as queuing start position, queue length, number of queued vehicles, real-time average speed, and the like, as well as the speed, model, lane number, occupancy time, etc. of each vehicle in four or more sections. Passing information. Optimize the timing scheme for traffic lights at intersections. Wireless networking, easy to install.
(3) On-street parking management system
A millimeter-wave radar radar plus a high-definition spherical camera can realize multi-lane multi-target vehicle tracking. Once the vehicle is stopped or in the parking space, the coordinates can be sent to the dome camera, and the license plate can be recognized by the dome camera. Then complete the billing process, accurate and reliable, reduce costs, and easy to install.
(4) Toll station length detection system
With the rapid increase in the number of motor vehicles, toll stations face different levels of congestion, especially during major holidays and tourist seasons. The congestion of highway toll stations is more prominent, which seriously affects the smooth travel of the public and also affects the charge management. . In order to cope with the traffic congestion situation of the toll station, it is urgent to improve the management and service level through intelligent technology, establish an automatic detection mechanism to judge the congestion status of the toll station, and provide the management department with intuitive and convenient toll station traffic status information. Services, make reasonable decisions for road network assisted management, on the other hand provide more accurate information for the masses of travel, use highway network management, traffic guidance, comprehensive information release and information inquiry to provide driving decision-making basis and help. The queuing warning system realized by millimeter wave multi-target tracking three-dimensional space detection technology is accurate and easy to install, and is not affected by weather, light and environmental climate change.
Safety aspect
(1) Event detection radar
The event detection radar is used as a traffic incident detection system, which adopts multi-target 3D scanning technology and advanced vehicle tracking algorithm. At the same time, the radar comes with a high-definition camera, which can accurately detect, track and monitor the vehicles within the target range all the time. Traffic anomalies are detected and immediately alarmed, and the camera is automatically triggered to adjust the position for on-site monitoring, capturing scenes and videos of traffic events, detecting overspeed, retrograde, lane change, violation, congestion, etc. of multiple vehicles in multiple lanes. Real-time traffic photos or videos to capture and verify on-site conditions.
The millimeter wave radar traffic event detection system combines the characteristics of radar accurate event detection and video visualization, and is suitable for highway, urban roads, tunnels, accident-prone areas and other various applications. It is a traffic manager for road traffic incident detection and traffic. The best choice for flow detection.
(2) Speed ​​warning system
The faster the car is, the more likely it is to cause a traffic accident. A millimeter wave radar plus LED screen constitutes a speed warning system that can simultaneously detect the speed of multiple vehicles in multiple lanes, and display the speed of each vehicle in real time, reminding the driver not to overspeed, and reducing the speed to a safe range. Thereby improving the safety of driving. Variable speed limit detection and prompting can also be implemented.
(3) blind zone danger warning system
Traffic blind spots bring huge safety hazards to road traffic, causing many traffic accidents. Using millimeter-wave three-dimensional space detection technology, the speed and distance of vehicles traveling in blind areas can be detected in real time. One radar can cover the blind space within 180 meters of multiple lanes, and the road side can be installed without destroying the road surface and interrupting traffic. At the same time, it adopts outdoor LED display technology to take the initiative to warn of dangers; automatically detect and proactively issue warning information all the time, free from weather, light and climate change; to improve safety, reduce traffic accidents, and protect the lives and property of the country and the people. .
Fourth, millimeter wave radar detection station
The traditional microwave vehicle detector can provide traffic flow and average speed data. The millimeter wave vehicle detection station also provides more comprehensive detection functions, including overspeed detection, event detection, etc. One device has law enforcement, management and Comprehensive function of security protection.
· Enforcement: It can achieve speeding, illegal lane change, illegal parking, retrograde, and emergency lane detection;
· Management: can realize traffic, speed, lane occupancy, congestion detection, queue length detection;
· Safety: It can realize safety hazard detection, safety accident detection, safety event warning and prevention.
(Millimeter wave radar detection station application photo)
Large-scale space detection:
· Simultaneous detection of 4-12 lanes 200 meters range
· Simultaneous detection of up to 128 targets
· Simultaneous detection of incoming/outgoing/two-way
A variety of real-time data:
· Simultaneous detection of multi-lane traffic flow, average speed, lane occupancy, vehicle model statistics, queue length information
· Simultaneously detect overspeed, retrograde, lane change, illegal suspension, emergency lane occupancy, and congestion in multi-lane and multi-vehicles
Easy to install and easy to use:
· Low power consumption, can support solar power, quick and easy installation and debugging
· Provide real-time traffic photos or videos to capture and verify on-site conditions
· Real 3D technology, fully automatic detection, no need to measure data such as height, width and angle
Five, millimeter wave intelligent intersection radar
Crossroads are important nodes of urban roads. Signal control is an important means of regulation of traffic flow. Inductive control and adaptive control of signal lights are of great significance for improving traffic efficiency and reducing congestion. This is based on real-time, reliable and reliable data detection and collection.
Millimeter-wave intelligent intersection radar can play an important role in this aspect with its unique advantages. It is a new generation of detection equipment after coil, geomagnetism and video.
Crossroad scene features
(1) Go-Stop-Go
The cross-road vehicle is characterized by Go-Stop-Go. When the vehicle stops, there will be a loss of signal and the target will be lost. The extremely accurate measuring capability of the millimeter-wave radar can track and keep the stationary queued vehicle target not lost.
(2) Vehicle convergence
When a red light is encountered, the vehicle is in a queue, and one car in each lane is followed by a car. Each lane is tight and becomes one piece, which makes the analysis of the target difficult. The millimeter wave radar is extremely accurate. Spatial resolution can effectively distinguish and locate each vehicle.
(3) More interference
There are not only vehicles at the intersection, but also a large number of non-motor vehicles and pedestrians. At the same time, there are various electromagnetic interferences, which cause great interference to the processing of signals. The strong anti-interference ability of millimeter wave radar can effectively obtain true and accurate. data.
(4) Complex road conditions
Case intersections have wide two-way 12-lane, corners, bridges, U-turns, non-motorized lanes and crosswalks. The road conditions are extremely complex and there are many sources of interference.
(Millimeter wave intelligent intersection radar case map)
(5) High precision anti-jamming
Complex road conditions are a huge challenge for any detection method. First, the detection technology is required to have high precision and anti-interference performance to obtain accurate basic data.
(6) Excellent artificial intelligence algorithm
Secondly, it also requires artificial intelligence algorithm to process the data complexly, and has good self-learning and adaptive functions to obtain accurate result data.
Installation layout
The intelligent intersection radars are respectively installed on the traffic lights in the four directions of the intersection. By detecting the traffic flow information in the direction of 200 meters in two directions and two directions, real-time traffic information detection, traffic signal induction control (intelligent conversion of traffic lights) and multiple Adaptive control of traffic lights at intersections and traffic guidance.
In each direction, the information such as the queue start position, queue length, number of queued vehicles, average speed and overflow of multiple lanes can be detected, and the speed, model, lane number and occupancy time of each vehicle with more than four lanes in multiple lanes can be detected. After waiting for the vehicle information, the timing scheme of the intersection traffic lights can be optimized, and the traffic light setting time of each lane of the traffic signal control machine can be dynamically adjusted to improve the traffic efficiency of the intersection and reduce congestion.
(Millimeter wave intelligent intersection radar installation layout diagram)
basic skills
Large-scale space detection:
· Simultaneous detection of 4-12 lanes 200 meters range
· Simultaneous detection of up to 128 targets
· Simultaneous detection of incoming/outgoing/two-way
A variety of real-time data:
· Simultaneous detection of multi-lane queuing start position, queue length, number of queued vehicles, real-time average speed, etc.
· Simultaneous detection of vehicle speed, vehicle type, lane number, occupancy time, etc. for each vehicle with more than four lanes in multiple lanes
· Provide up to four trigger detection areas or more than four queue length alarm signals
· Provide 26ms data update, as well as switch, 485 and RJ45 multiple data output interfaces
Easy to install and easy to use:
· Can be wirelessly networked, quick and easy to install and debug, no need to thread and break
· Provide real-time traffic photos or videos to capture and verify on-site conditions
· Real 3D technology, fully automatic detection, no need to measure data such as height, width and angle
· Real 3D technology, fully automatic detection, no need to measure data such as height, width and angle
(Millimeter wave intelligent intersection radar installation)
Data application
Accurate detection of millimeter-wave intelligent intersection radar can provide lane-level and millisecond-level data. This detection is microscopic, real-time and accurate, and can be used for signal sensor control system, induction control, adaptive control and green band control. It is also the basis for realizing the synergy of the car network roads in the future.
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