The increasingly complex road traffic environment has prompted China's requirements for intelligent traffic management systems to become intelligent, comprehensive, accurate, and real-time. To achieve 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 have extremely important applications in the field of intelligent transportation.
For example, it can be used for vehicle detection, traffic investigation, traffic incident detection, traffic guidance, speed monitoring, electronic bayonet, electronic police and traffic light control.
First, the advantages of millimeter wave radar
Millimeter-wave radars are radars that work in millimeter wave detection. In general, millimeter waves refer to the frequency range of 30 to 300 GHz (wavelength 1 to 10 mm). The millimeter wave has a wavelength between centimeter wave and light wave, so the millimeter wave has advantages of both microwave guidance and photoelectric guidance.
The millimeter-wave radar has the characteristics of small size, easy integration, and high spatial resolution compared with the centimeter wave radar. Early applied to the military field. With the development and progress of radar technology, millimeter-wave radar sensors have been 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 micro waveguide seeker, the millimeter waveguide seeker has the characteristics of small volume, light weight, and high spatial resolution. When the antenna aperture is the same, the millimeter-wave radar has a narrower beam (usually measured in milli-arc scale), which can improve the angular resolution and angle measurement accuracy of the radar, and is conducive to resisting electronic interference, clutter interference and multipath. Reflection interference.
(2) All day and all day
Compared with optical seekers such as infrared, video, and laser, the millimeter wave guide has a strong ability to penetrate fog, smoke, and dust, and has the characteristics of all-weather and all-day weather.
(3) High-resolution multi-target
Due to the high operating frequency, large signal bandwidths (eg, in the order of gigahertz) and Doppler frequency shifts may be obtained, which helps to improve the measurement accuracy and resolution of the distance and velocity, and to analyze the target details. At the same time, millimeter-wave radar can recognize very small targets and can identify multiple targets at the same time, so it has strong spatial resolution and imaging capabilities.
(4) High sensitivity and low false positives
The system has high sensitivity, low false alarm rate, and is less susceptible to external electromagnetic noise.
(5) High frequency and low power
Has a higher transmission frequency, lower transmission power.
(6) Measurable speed can be measured
Using FMCW frequency-modulated continuous wave, it can measure the distance and speed of multiple targets at the same time, and can continuously track the target. Even the stationary target can keep track of loss.
(7) High real-time distance
The measurement distance is far, reaching two-way 12-lane 200 meters away, while 38Hz26ms detection frequency has a very strong real-time.
Second, 4D millimeter wave visual radar
4D millimeter-wave visual radar is a multi-lane and multi-target tracking 4D video radar specially designed for intelligent traffic systems. It uses the world's first intelligent three-dimensional space millimeter wave detection technology to provide precise X, Y, Z three-dimensional coordinates and a Speed ​​4D multi-target tracking trajectory information in real time to ensure accurate detection and statistics of various information for each driving vehicle.
The radar has a completely new type of millimeter-wave vehicle detector with independent intellectual property rights. It uses the principle of frequency-modulated continuous wave and Doppler technology to launch millimeter waves on the road surface. Through the digital processing analysis of the echo signals at high speed and real-time, the bicycle speed and average are detected. Non-contact traffic detectors for basic traffic flow information such as speed, traffic flow, lane occupancy, vehicle model, queue length, and event analysis.
The 4D millimeter-wave visual radar series is an integrated high-definition video camera that can simultaneously monitor 4-12 lanes and provide 128 targets of high-resolution 4D radar trajectory information and display them synchronously on the video. The 4D millimeter-wave visualization radar's four-dimensional identification technology enables it to accurately measure speed and track the target trajectory, providing very accurate data even on large traffic or congested road sections.
Third, the application of millimeter wave radar
4D millimeter-wave visual radar is mainly used to collect and monitor traffic parameters such as expressways, urban roads, and ordinary road traffic, providing accurate, reliable and real-time traffic information for traffic management, and providing technical support for realizing traffic intelligence. 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 specifically for speed measurement can be mounted in a plain or diagonal position to provide accurate vehicle speed and positioning information to ensure that every superspeed car in the detection section is captured. A radar and a high-definition camera can achieve multi-lane and multi-target speed measurement. At the same time, each vehicle's license plate is identified and differentiated and directly superimposed on the vehicle. Accurate and reliable, the capture rate is high, the cost is reduced, and installation is simple. Avoid the interference of the single-lane speed radar and the problem that multiple cars cannot be used on one picture.
(2) Electronic bayonet radar
A multi-lane, multi-target tracking radar designed specifically for the electronic bayonet can automatically detect vehicles in the tracking area. When the vehicle meets the set trigger conditions, the output signal triggers HD camera capture and forensics to form the front-end acquisition unit of the bayonet system. .
With multi-target recognition and tracking capability, it can provide the trigger signal of the specified position and precise vehicle speed according to the lane in the bayonet system, and can also provide traffic information such as traffic volume, average speed, and occupancy rate according to the cycle, and the radar performs data collection on completion. After the statistics, it is directly output to the user, and no additional computer is required for calculation and statistics. Installation and debugging are simple and convenient, and the trigger position is set by parameters, and no need to repeatedly adjust the installation angle to find the trigger position.
(3) Electronic Police Radar
A multi-lane, multi-target tracking radar designed specifically for electronic police can provide accurate vehicle information and video surveillance to ensure that every illegal vehicle in the detection section is captured, it does not need to destroy the road, and is not affected by light and weather changes. Instead of detecting coils, geomagnetism, and video, it detects the speed, retrograde, lane change, illegal stop, and accidents of 128 vehicle targets in 4-12 lanes at the same time.
Management aspects
(1) Flow Detection Radar
A multi-lane, multi-target tracking radar designed specifically for electronic police can provide accurate statistical information such as traffic volume, average speed, and lane occupancy rate within a range of 180 meters. Flow accuracy is ≥99%, and lane occupancy accuracy is ≥99%. The average speed accuracy is ≥99%, which provides real-time road photos or videos for mastering and verifying on-site conditions, providing 30ms detection updates and RJ45, 485 two signal outputs.
(2) Smart intersection radar
A smart intersection radar can simultaneously detect queuing starting positions, queue lengths, number of queuing vehicles, real-time average speed, etc. of multiple lanes, and the speed, vehicle type, lane number, occupancy time, etc. of each of the four or more sections. Car information. It can optimize the timing scheme of traffic lights at intersections. Wireless networking, easy to install.
(3) On-street parking management system
A millimeter-wave radar radar plus a high-definition dome camera can realize multi-lane and multi-target vehicle tracking. Once the vehicle is stopped or parking spaces are detected, coordinates can be sent to the dome camera to complete the license plate recognition by the dome camera. Then complete the billing process, accurate and reliable, reduce costs, easy to install.
(4) Queuing length detection system for toll stations
With the rapid increase in the number of motor vehicles, toll stations are facing different degrees of congestion, especially during major holidays and tourist seasons. The congestion of highway toll stations has become more prominent, which has seriously affected the smooth travel of the public and has also affected the toll management. . In order to deal with traffic congestion at toll stations, there is an urgent need to improve management and service levels through intelligent technology, and establish an automatic detection mechanism to determine the congestion status of toll stations. On the one hand, it provides the management department with intuitive and convenient information on the traffic status of toll stations. The service makes reasonable decisions for the auxiliary management of the road network. On the other hand, it provides more accurate information for the majority of people on the trip, and provides decision-making and assistance for the use of highway road network management, traffic guidance release, comprehensive information release, and information query. The queuing and early warning system using 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 changes.
Safety aspects
(1) Event Detection Radar
Event detection radar is used as a traffic incident detection system, multi-target 3D scanning technology and advanced vehicle tracking algorithms are adopted. At the same time, the radar comes with a high-definition camera to accurately detect vehicles in the target range, real-time tracking and video surveillance. The abnormal traffic incidents are detected and immediately alarmed, and the camera is automatically triggered to adjust the position to conduct on-site monitoring, capture traffic accident scene pictures and videos, and detect multiple speeds, retrograde, lane change, illegal stop, and congestion of multiple vehicles with multiple lanes. Real-time traffic photos or videos for mastering and verifying on-site conditions.
Millimeter-wave radar traffic incident detection system, which combines the characteristics of radar precision event detection and video visualization, is applicable to highways, urban roads, tunnels, accident-prone areas and other various applications. It is a traffic manager to detect road traffic incidents and traffic. The best choice for traffic detection.
(2) Speed ​​prompt system
The faster a car is, the easier it is to cause a traffic accident. A millimeter-wave radar plus LED screen forms a speed prompting system that can simultaneously detect the speed of multiple vehicles in multiple lanes and display the speed of each vehicle in real time to remind the driver not to overspeed and reduce the speed to a safe range. This will increase the safety of driving. Variable speed limit detection and prompting can also be implemented.
(3) Blind Zone Danger Warning System
The visually-impaired traffic zone has brought huge security risks to road traffic and caused many traffic accidents. Millimeter-wave three-dimensional space detection technology can be used to detect the speed and distance of blind vehicles in real time. A single radar can cover the blind space within 180 meters of multiple lanes. The roadside installation eliminates the need to damage the road and disrupt traffic. At the same time, it adopts outdoor LED display technology to proactively warn of dangers; it automatically detects and proactively releases warning information during the day and is not affected by weather, light, or climate change; it improves safe passage, reduces traffic accidents, and protects lives and property of the country and people. .
Fourth, millimeter wave radar detection station
The traditional microwave vehicle detector can provide vehicle flow and average speed data. The millimeter-wave vehicle detection station also provides more comprehensive detection functions based on this, including overspeed detection, event detection, etc. One device is equipped with law enforcement, management and The comprehensive function of safety precautions.
In terms of law enforcement, speeding, illegal lane changing, illegal parking, retrograde, and emergency lane detection can be achieved. In terms of management, traffic, speed, lane occupancy, congestion detection, and queue length detection can be achieved. In terms of security, security risk detection can be implemented. Security accident detection, security event warning and prevention.
Five, millimeter wave intelligent intersection radar
Crossroads are important nodes of urban roads. Signal light control is an important means of controlling traffic flow. The realization of signal lights' inductive control and adaptive control is extremely important for improving traffic efficiency and reducing congestion. This is based on real-time, reliable and reliable data detection and acquisition.
Millimeter-wave intelligent intersection radar can play an important role in this regard with its unique advantages. It is a new generation of testing equipment following coils, geomagnetism, and video.
Crossroads Scene Features
(1) Go-Stop-Go
Vehicles at the crossroads are characterized by Go-Stop-Go. When the vehicle stops, there is a signal loss and the target is lost. The extremely accurate distance measurement capability of the millimeter-wave radar can track and maintain the stationary queuing vehicle target without losing it.
(2) Vehicle density
When a vehicle encounters a red light, when a vehicle is in a queue, a car in each lane follows a car. Each lane is tight and becomes a piece. It is difficult to analyze the target. 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 crossroads, but also a large number of non-motorized vehicles and pedestrians, as well as various electromagnetic interferences, which cause a great deal of interference to signal processing. The extremely strong anti-jamming capability of millimeter-wave radar can effectively obtain true and accurate data.
(4) Complex road conditions
The case crossroads have a wide range of 12 lanes, corners, bridges, U-turns, non-motorized lanes and crosswalks. The road conditions are extremely complex and there are many sources of interference.
(Millimeter Wave Smart Intersection Radar Case Diagram)
(5) High-precision anti-interference
Complex road conditions are a huge challenge for any detection method. First, the detection technology is required to have high accuracy and anti-jamming performance in order to obtain accurate basic data.
(6) Excellent Artificial Intelligence Algorithm
Secondly, it requires the use of artificial intelligence algorithms to perform complex data processing, and has good self-learning and adaptive functions to obtain accurate result data.
Installation layout
The smart intersection radars are respectively set up on the traffic light poles in four directions at the crossroads. By detecting traffic flow information of 200 meters in two directions in different directions in four directions, real-time traffic information detection, traffic signal light sensing control (intelligent conversion of traffic lights) and multiple Intersection traffic lights adaptive control and traffic guidance and other functions.
Each lane can detect multi-lane queuing starting position, queue length, number of vehicles queuing, average speed and whether it overflows, and detects the speed, vehicle type, lane number, occupancy time of each car with more than four lanes in multiple lanes. Waiting for car information can optimize the time-sharing scheme of traffic lights at intersections, dynamically adjust the setting time of traffic lights in each lane of traffic signal control machines, improve the traffic efficiency of crossroads, and reduce congestion.
Data application
The precise detection of the millimeter-wave intelligent intersection radar can provide lane-level and millisecond-level data. This detection is microscopic, and it is also real-time and accurate. It can be used for real-time induction control, adaptive control and green waveband control of the signal light controller. It is also the basis for the future realization of car networking.
(Nanjing Aojie Intelligent Technology Co., Ltd.)
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Dongguan Liyang Intelligent Technology Co., Ltd , https://www.leyocncmachine.com