Millimeter-wave radar sensor manufacturers curved road crossing warning radar sensing technology solution.In some common traffic bends and intersections, such as urban roads, national roads, provincial roads, county and township roads, steep curves, intersections, or intersections of main roads and branch roads with blind spots. Due to limited sight distance, climate impact or lack of effective early warning means, accidents occur frequently and there are no obvious and effective preventive measures. In response to these problems, as well as four application scenarios such as high-speed curves, highway curves, crossroads sentinels, and pedestrian crossings, millimeter-wave radar sensor manufacturers have launched an overall solution for road warning radar sensors. The following is a detailed analysis and recommendations for the application background and principles of these four areas.

1. Millimeter wave radar sensor manufacturers high-speed curve warning radar solutions

Application background: Among the many factors that cause frequent traffic accidents on expressways, the road geometry alignment is one of the most prominent factors, and the curved road section is an important manifestation of the expressway alignment error. Due to its complex line conditions and various forms of vehicle environment, it has become a hardest hit area for road traffic safety. According to data released by the U.S. Highway Safety Administration, rollover accidents are second only to collisions in cornering accidents. When the vehicle rolls over, due to the short duration of the whole process, the driver cannot implement self-rescue in time, resulting in a rollover accident that often brings fatal consequences. In addition to rollovers, rollovers can easily lead to dangerous situations such as vehicle drift and loss of steering ability, and also pose a huge threat to vehicle driving safety. Rollover and rollover accidents are likely to cause secondary traffic accidents, causing greater damage to subsequent vehicles and affecting the traffic conditions of the expressway.

Millimeter wave radar sensor application principle: high-speed curve early warning is completed by the high-speed curve early warning system, which generally consists of three parts: data acquisition module, calculation module, and early warning feedback module. The data acquisition module can collect the real-time speed of the vehicle before entering the curve (generally completed by the speed radar), license plate number, model, road, environment and other information according to the user's needs, and transmit it to the calculation module. The calculation module calculates the safe speed of the target vehicle through the collected information data such as vehicle type, road, environment, etc., calculates the driving safety of the vehicle through the real-time speed and safe speed, and judges the safety of the current driving state of the vehicle through the early warning strategy, whether an early warning feedback module is required. Make an early warning. If an early warning is required, the warning feedback device LED vehicle warning feedback information will be displayed on the display, including the license plate number, safe speed, driving speed and safety reminder information. Of course, the real-time speed of the vehicle and the preset safe speed can also be directly used as the early warning and feedback parameters. When the radar detects that the real-time speed of the vehicle reaches the critical point of the safe speed, an early warning signal is sent to the early warning feedback device. The early warning system is relatively simple. The cost is relatively low, and users can choose according to their needs.

2. Millimeter-wave radar sensor manufacturers turn-by-turn warning radar solutions

Application background: At present, most road curves have only one convex wide-angle mirror as an early warning device. The driver detects the vehicle that is about to enter the opposite/blind spot through the reflection of the convex wide-angle mirror. However, because it is easily polluted, it cannot be used in haze, dark and no lights. Most drivers habitually occupy another lane when turning, or walk in the middle of the two lanes, resulting in the warning given by the convex wide-angle mirror. The signal is not obvious enough to attract the attention of all drivers. Therefore, for urban roads, national and provincial roads, county and township roads and other unfavorable terrains such as sharp turns and steep slopes, it is of great significance to use the intelligent curve warning system to perform real-time dynamic detection of road traffic, and warning and guidance. In particular, due to the many continuous curves, sharp curves, large road gradients, and poor road sight distances on mountain roads, mountain roads have high driving risks and high safety requirements. A little carelessness or improper operation will cause a traffic accident in the mountain bend, and even cause traffic hazards such as rollover and crash.

Application principle: When the millimeter-wave radar sensor detects an oncoming vehicle in the opposite/blind area, the warning signal of the future vehicle is sent to the same-direction warning display, and the same-direction warning display receives the red warning signal "Ahead of the vehicle" subtitle, and displays the coming vehicle. The real-time speed of the car, the warning light flashes yellow, and the voice alarm sounds "There is a car ahead, please slow down". Through the early warning screen (warning system), the driver can know the speed and driving information of the opposite/blind lane in front before entering the curve, which plays a warning and prompting role for the driver, thereby effectively reminding the driver to slow down. Drive carefully through curves. Under normal circumstances, the green "Slow on the curve" subtitles will be displayed on the LED screen of the warning LED screen, warning the driver to bend forward and drive slowly.

3. Millimeter wave radar sensor manufacturers' solutions for junction sentinel early warning radar

Application background: The intersection is an important part of the road traffic system. It is the node and hub of the road network. It bears a large amount of traffic flow and has very important functions. But at the same time, the intersection has become the bottleneck of road traffic safety because of its "throat" characteristics, especially the national roads, provincial roads, county and township roads with many openings and imperfect traffic infrastructure such as marking lines. There is inrush and interference between vehicles and pedestrians and vehicles at intersections, especially between non-motorized vehicles and motorized vehicles, with great uncertainty and easy to cause traffic accidents. According to general statistics, 60% of road traffic accidents occur at intersections and their surrounding areas. Therefore, special attention should be paid to safety warnings at intersections, reminding drivers or pedestrians of the position and speed of vehicles at intersections, so as to wait or slow down in advance to reduce traffic accidents.

Application principle: When the millimeter-wave radar sensor detects that the vehicle is approaching the intersection, the detection result will be transmitted to the system control chip, and the system control chip will send the corresponding instructions to the LED display or screen voice announcer to inform the upcoming through beating/highlighted subtitles. Drivers of vehicles entering the intersection or pedestrians entering the intersection, such as red "oncoming traffic" waiting for subtitles, and display the real-time speed of the oncoming traffic. Drivers or pedestrians can even be notified to avoid vehicles via voice announcements. Under normal circumstances, the vehicle warning LED screen at the intersection displays green subtitles such as "Slow at the intersection", warning drivers and pedestrians at the intersection ahead to be careful and slow. Similarly, for intersections or road sections without signal light control, in order to ensure the safety of pedestrians crossing the street, the radar also needs to perform real-time detection and early warning feedback for pedestrians at the intersection, and the warning display displays red subtitles such as "Pay attention to pedestrians" to notify motor vehicles in advance. There are pedestrians crossing the street in the area in front of the driver, pay attention to slow down and give way, and stop and give way if necessary.

Fourth, millimeter wave radar sensor manufacturers pedestrian crossing warning radar solutions

Application background: At present, the protection of pedestrian safety in the implementation of "comity to pedestrians" still depends on the driver's active discovery. When drivers have various psychological and physiological situations, they tend to be negligent; secondly, in low illumination (night), low visibility (rain and fog, etc.), it is difficult for drivers to quickly and accurately identify pedestrians; third, continuous acceleration or Vehicles approaching the zebra crossing at high speed may lose control and hit pedestrians if they do not decelerate in time. Therefore, it is necessary to provide safety warnings to vehicle drivers for crossing the street, so that drivers can wait or slow down in advance to reduce the occurrence of traffic accidents.

Application principle: When the millimeter-wave radar sensor detects that a pedestrian is about to enter or pass through a zebra crossing, it transmits the detection result to the system control chip, and the system control chip sends instructions to the corresponding luminous signs, LED displays, LED warning piles, LED floor lights, etc. Roadside facilities send remote strong warning information to vehicle drivers through flashing lights and discoloration, and drivers take corresponding concession measures in advance.