Millimeter-wave radar sensors help early warning and campus safety at intersections. With the rapid maturity of intelligent transportation technology, the construction of transportation infrastructure is becoming more and more perfect, and the traffic demand is extremely increased. It has become the way to achieve road traffic management "safe travel. Civilized travel" goals and objectives important dependencies and prerequisites.
Among various travel modes, walking accounts for a large proportion, but there are still many problems: first, safe travel, in the road sections with unbalanced flow of people, in the commercial and residential areas with complex traffic, in the sections and intersections where urban buses pass by. In the urban trunk lines with poor lighting conditions, pedestrian crossings and motor vehicle rushing often occur, which seriously affects the safety of pedestrians' lives and property; the second is civilized travel, and vigorously carry out activities to create a spiritual and civilized city throughout the country to improve citizens' moral quality and laws. Under the background of awareness, the contradiction between pedestrians and motor vehicles in the use of limited road resources has become a problem that restricts the progress of social and humanistic quality and an important reason for the development of spiritual civilization; Make the maximum use of limited road resources to truly form a safe, efficient, harmonious and stable travel mode.
It can be seen that the use of innovative technologies related to pedestrian monitoring millimeter-wave radar sensors to develop a new type of pedestrian crossing civilized and comity early warning system, to install intelligent "eyes" for pedestrians on zebra crossings to eliminate various traffic safety hazards for pedestrians crossing the street, and to improve the safety of pedestrians and motor vehicles on the road. Traffic efficiency is an urgent requirement and important issue to realize the comprehensive development of the intelligent transportation system, and it also brings a huge market space.
Pedestrian detection millimeter wave radar sensor working principle
Pedestrian monitoring radar is mainly used to monitor pedestrians crossing the street. It adopts 24GHz radar and active light-emitting traffic signs/light-emitting warning devices (LED display screen, warning pile, road stud) to cooperate and realize.
According to the monitoring requirements of road zebra crossings or other key safety areas, draw the area that needs to be monitored. When the target pedestrian appears in the drawn monitoring area, the millimeter-wave radar sensor will identify and output the switch value, and report the speed and position information of the target pedestrian, which is used as the early warning basis for the active light-emitting traffic sign/light-emitting warning device. The remote warning information is sent to the driver of the vehicle by means of strobe light, light discoloration, etc., so that the driver can take corresponding concession measures in advance.
When the vehicle passes through the zebra crossing monitoring area, the radar will identify and mark the target vehicle and not report it, which can effectively prevent virtual alarms and achieve the purpose of saving energy and reducing consumption. In addition, compared with video detection technology, radar detection results are not affected by luminosity, and can also provide high-reliability monitoring in harsh environmental conditions such as heavy snow, darkness, and air pollution.
Millimeter wave radar sensor product features:
1. The monitoring area can be set
2. Can accurately monitor the moving speed, orientation, number, etc. of pedestrians in the area
3. Monitoring and stable tracking of multiple targets can be achieved
4. It can distinguish pedestrians and vehicles, filter clutter, and prevent false alarms
5. Using the 24GHz frequency band and the vehicle radar will not interfere with each other
6. Control signal output, which can be linked with roadside luminous warning/intelligent control devices, etc.
7. Anti-interference, monitoring is not affected by wind, light, climate, temperature changes, etc.
8. Support multi-environment/multi-scene personnel monitoring, population statistics and security warning, etc.
9. Low power consumption, suitable for solar power supply scenarios
Millimeter-wave radar sensor solutions contribute to the comprehensive and effective restraint of speeding behavior on campus, and the scale of the university. With the continuous advancement of socialization and open construction, a large number of social vehicles flood into the campus, bringing the school's road traffic and safety management. a severe test. In recent years, campus traffic accidents have occurred frequently, ranging from ordinary scratches to life safety, which not only put forward higher requirements for the management of school safety departments (departments), but also become an important aspect to measure the comprehensive competitiveness of colleges and universities. Simple campus speed limit signs only serve as a reminder of speeding, not restraint. Therefore, many colleges and universities have begun to introduce college vehicle speed measurement feedback systems, standardize campus road management with the help of modern Internet of Things technology, and strengthen college road safety construction.
According to Article 2 of the Regulations of the People's Republic of China on the Administration of Road Traffic: "The term "roads" as used in these Regulations refers to highways, urban streets and hutongs (li lanes), as well as public squares, public parking lots and other places for vehicles and pedestrians to pass. "
Therefore, other locations than the above-mentioned locations, such as railway crossings, ferry crossings, government compounds, residential quarters, and schools do not belong to the "roads" of the "Road Traffic Management Regulations". The collision of vehicles and pedestrians in the above-mentioned places, even causing casualties or property damage, does not belong to the scope of adjustment and standard objects of the "Measures for Handling Road Traffic Accidents".
Vehicles and traffic police on the internal roads of the school will not come to the scene to deal with pedestrian collision casualties or property damage accidents, and usually the school security department will handle them on their own. If it is really necessary for the public security traffic department to assist in the investigation, the public security department will assist in the handling, or the school may entrust the traffic police department to handle it, but the main communication and coordination work, or the school security department will be responsible.
The main reasons why campus accidents are prone to occur:
1. The old campus has narrow roads and lush trees on both sides of the road, blocking the line of sight. For some road emergencies, drivers cannot predict and react in time.
2. The roads in the new campus are wide and flat, and there are no traffic lights. The drivers are subjectively careless and prone to speeding and reverse driving.
3. Pedestrians, bicycles, electric vehicles, tricycles, hybrid vehicles, non-compliance with road travel, side-by-side driving, and chasing driving are very common, and are likely to cause road traffic accidents.
4. During the end of get out of class, during some large-scale cultural and sports activities, competitions and assemblies, the density of people and vehicles is high, and the campus security department has limited management personnel, so they cannot guide in a timely and orderly manner, which may easily cause congestion and scratch accidents.
5. There are security patrols on campus during the day, which may prevent vehicles from speeding, but many drivers do not pay enough attention to driving at night, which poses a great safety hazard to students traveling at night.
6. The campus road management function is assigned to the school security department, but the security department does not have the corresponding law enforcement power, and cannot enforce the law against speeding vehicles, deduct points from driver's licenses, fines and other penalties for illegally parked vehicles. The deterrence of vehicle drivers is obviously insufficient.
In order to ensure the traffic safety of teachers and students, reduce campus traffic risks, purify the campus traffic environment, and effectively supervise driving behavior, colleges and universities have installed millimeter-wave radar sensor vehicle speed feedback systems on the main roads of campus traffic.
According to the decision of the school office meeting, the school will punish illegal parking and speeding on campus and other traffic violations: the speed limit of motor vehicles in the hospital is 20 km/h, and speeding is strictly prohibited. For the first violation, a text message will be sent to remind you. Post violation notices and register. The system automatically stops the camp gate vehicle identification permission for one month.
The vehicle speed measurement feedback system in colleges and universities is mainly composed of millimeter wave radar sensor speed measurement radar, snapshot camera, speed measurement pole, LED display screen, control host and storage device. It is mainly installed on the main roads of the campus, where people pass through dense areas, accident-prone areas, etc. The data collected by the speed measurement system includes vehicle speed, license plate number, speed measurement time, speed measurement location, etc.
First, the collected information is transmitted to the roadside LED display through the network cable or serial port to inform the driver of the real-time speed of the vehicle and overspeed reminder; the second is to transmit the data to the computer room of the school safety monitoring center through the optical fiber to store the data; the third is to push it to the school access control in real time. The toll management system realizes the statistics of speeding times, illegally warns and controls access to severely speeding vehicles, and even blacklists them.
Among them, the speed measuring radar adopts our company's flat-panel speed measuring millimeter wave radar sensor. The two radars are installed above the main road of the school to detect the real-time speed of the vehicle on the two-way single lane at the 50m trigger position, and synchronize the detection data to the roadside LED display. . Based on the microwave Doppler effect, the millimeter-wave radar sensor can detect the speed of vehicles passing at the trigger position, and identify and capture vehicle information such as license plate numbers through a linked camera.
When the vehicle speed is lower than the speed limit value of 20km/h, the LED display shows the green speed value, and the radar-linked camera recognizes the license plate number; when the speed exceeds the speed limit value, the red speed value is displayed to remind the driver to control the speed, and the radar-linked camera recognizes and capture.
