The value of radar is obvious. Now major car companies are particularly concerned about the promotion of intelligent assisted driving. Many users have also learned terms such as camera, millimeter-wave radar, and lidar from it, but how it actually works and what it does. What are the advantages and disadvantages, everyone is ignorant, today I will give you a rough introduction.

First of all, the radar and search camera used in cars cannot be confused, but the two complement each other. Among them, there are many types of automotive radar, and the functions they are responsible for are also different, such as laser radar, ultrasonic radar, and microwave radar. The functions include detecting obstacles, predicting collisions, adaptive cruise, etc., among which lidar is the most common one.

Let’s start with several of the most common radars and analyze them one by one:
Parking radar (speed radar): The role of parking radar is to observe the terrain well in the case of low or no visibility, and to carry out effective early warning to reduce the occurrence of accidents. Its working principle is in the car There are radar probes on the front bumper and rear bumper. During the driving process, the radar emits sound waves forward. The sound waves encounter obstacles and then reflect back in the process of moving forward. After the radar receives the reflected sound waves, it Time difference, so as to judge the distance from the obstacle, apply it to the car, after the calculation of the chip and the system, if the reflection time is short, when the preset warning value is reached, the car will make a sound to remind the car personnel within.
Adaptive cruise radar: Adaptive cruise radar is more intelligent, it can adapt to the surrounding environment of the vehicle, and can keep a safe distance with the vehicle in front and the surrounding vehicles during the driving process, and follow the vehicle, etc. When the radar detects that the distance to the vehicle in front is relatively close, it will feed back to the system, and the system will perform deceleration or braking operations. The adaptive cruise function is more perfect than the constant speed cruise, and the adaptive cruise is also more efficient than the constant speed cruise. Radar monitoring, vehicle distance judgment. Intelligent accusation, active braking, electronic imaging and collision warning, etc., can be said to be a complete set of complete systems.

Collision radar: This type of radar is based on the current direction and speed of the vehicle. After detecting obstacles that can cause collisions in front, it warns the driver to control the speed of the car or turn on other braking equipment. It is also generally used in When the visibility is low or the actual judgment is not ideal.

Lidar: It uses laser as the signal source to emit pulsed laser light, which is irradiated on trees, roads, bridges and buildings, causing scattering. When a part of the light wave is reflected on the Lidar receiver, it is calculated to obtain the data of the target point, after processing, the 3D image is obtained, which has the advantages of high resolution, good concealment, strong anti-interference ability, small size, light weight, etc., but the disadvantage is that it is greatly affected by the weather and environment Search and capture targets within range.

Like our commonly used cameras, it is an important part of imaging. The most important ones are 360° panoramic images and reversing images. Through the wide-angle lens at the rear of the vehicle and a control unit responsible for signal processing and transmission, images are formed on the central control screen. , This is the common reversing image, while the panoramic image is a look-around image that is assembled by multi-directional cameras, in which the resolution of the camera and the clarity of the picture occupy an important part.