What do you know about the application of millimeter wave radar in intelligent transportation?
I. What is millimeter wave radar?
Millimeter wave radar, is a radar that works in the millimeter wave frequency band. Usually millimeter wave refers to the electromagnetic wave in the frequency domain of 30-300GHz (wavelength of 1-10mm). Millimeter waves are located in the wavelength range where microwaves and far-infrared waves overlap, so millimeter waves have the advantages of both wave spectra and their own unique properties. Compared with microwaves, millimeter waves have high resolution, good directivity, high interference immunity and good detection performance.
Compared to infrared, millimeter waves have low atmospheric attenuation, better penetration of smoke and dust, and are less affected by weather. In addition, millimeter wave radar exhibits better performance than other sensors such as LIDAR and cameras in its ability to measure the distance, speed and angle of a target.
Second, the application of millimeter wave radar in intelligent transportation
In daily life traffic, especially the more complex level crossings and some highways, sensors are used to track traffic conditions and keep the roads open.
These sensors must have: superb accuracy, stability, sensitivity and anti-interference, able to work around the clock, regardless of rain, snow, fog and other environmental effects.
Currently big data, video and radar detection means can provide multi-modal data, of which millimeter wave radar has the technical advantage of having extremely important applications in the field of intelligent transportation.
Millimeter wave radar can accurately collect objective and effective road traffic information, and obtain data such as traffic flow, speed and basic types of vehicles, so as to realize intelligent means of monitoring, control, analysis, decision making, scheduling and diversion, and provide technical support for traffic intelligence.
(I) Law enforcement
(1) Speeding capture trigger radar
Speeding capture trigger radar can automatically detect the vehicles in the area, and when the vehicle meets the trigger conditions set by the radar, the radar output signal triggers the HD camera to capture. The radar is highly accurate and can accurately capture the license plate of speeding vehicles, which is widely used in highways, intercity highways, urban trunk highways, urban and rural low-grade highways and other traffic accident-prone areas.
(2) Multi-lane multi-target speed detection radar
Based on the advantages of narrow-wave single-lane speed radar, it realizes the accurate division of multiple lanes, effectively avoids the interference of adjacent lanes, and realizes the detection of multiple speeding vehicles on 1~4 lanes, multi-lane multi-target speed radar can provide the basic information of the measured vehicle speed and the lane where the vehicle is located to ensure the accurate detection of every speeding car on the road section, one radar plus one HD camera can Realize multi-lane multi-target speed detection, accurate and reliable, high stability.
(II) safety aspects
(1) Speed feedback system radar
The faster the speed of the car, the more likely to trigger traffic stories, radar speed feedback system integrated with LED display technology constitutes a speed feedback system, can be applied to highways, ordinary state and provincial trunk roads and rural roads and other types of vehicle speed detection, and through the LED display shows the speed of the vehicle, if the vehicle is speeding, LED will issue an alert to remind drivers not to exceed the speed.
(2) Curve warning speed feedback radar
At both ends of the vehicle into the curve installed radar curve warning system, real-time collection of passing vehicles driving speed, and sent to the opposite lane roadside vehicle warning device on the display. So that the passing driver before entering the bend through the display to understand the information of the opposite direction vehicle driving ahead. When the traffic comes from the front opposite lane, the display will appear in red, and at the same time display the speed information of the opposite vehicle, and sound and light prompts to remind the driver that there is an oncoming vehicle in front of him, and he needs to slow down.
(C) Management
(1) Traffic flow detection radar
Traffic flow meter radar is specially designed for intelligent intersections, multi-lane chokepoints and other multi-lane multi-target tracking radar, accurate detection of vehicle information, such as road traffic flow, the average speed of vehicles, vehicle flow, traffic congestion, vehicle retrograde and other basic traffic information, with the camera can also provide real-time road photos or video, providing the Ministry of Transportation department with accurate, reliable, real-time intersection information to help improve the operational efficiency of the traffic system.
