What is automotive microwave radar
Automotive microwave radar is a radar system that uses microwaves for detection, mainly used in automobiles and other ground motor vehicles. Microwave radar detects objects in the surrounding environment by sending and receiving microwave signals, so as to achieve various functions, such as obstacle detection, collision warning, adaptive cruise control, etc .
Working principle
Automotive microwave radar works similar to ordinary radar, that is, it sends a wireless wave (microwave) and then receives the echo according to the time difference between receiving and receiving, so as to measure the position data of the target. Specifically, microwave radars emit microwave signals that bounce back when they encounter obstacles, and the radar calculates distance by measuring the round-trip time of the signals. In addition, microwave radar can also detect the speed and direction of an object by analyzing the characteristics of the reflected signal, such as the Doppler effect .
Application scenario
Automotive microwave radar has a variety of application scenarios in automobiles:
collision warning : by detecting the obstacles ahead, early warning, help the driver to take measures to avoid collision .
adaptive cruise control : Automatically adjusts the speed of cruise control according to the surroundings of the vehicle, maintaining a safe distance from the vehicle in front .
pedestrian detection : In the automatic driving system, microwave radar can detect pedestrians and other obstacles to ensure driving safety .
automatic parking : Help the vehicle automatically find the right parking space in the parking lot and complete the parking operation .
Technical parameters and performance characteristics
Automotive microwave radars typically operate in millimeter wave bands, such as 24GHz, with higher frequencies and shorter wavelengths. This makes microwave radar have high directivity and resolution, and can accurately detect close-range targets. In addition, the microwave radar is not affected by visibility and can operate normally in bad weather conditions. However, the cost of microwave radar is relatively high, and the ability to detect small objects is not as good as lidar .
The main functions of automotive microwave radar include the following aspects :
Collision Warning and Automatic Emergency Braking (AEB) : Microwave radars detect obstacles ahead and if necessary trigger an automatic emergency braking system to prevent a collision .
pedestrian detection : Through microwave radar, cars can recognize and detect pedestrians, thereby improving driving safety .
Blind spot monitoring and lane Departure warning : microwave radar can monitor the blind spot area of a vehicle to prevent collision with other vehicles when changing lanes, and can monitor lane departure and alert drivers to .
Adaptive cruise control (ACC) : Microwave radar can help vehicles maintain a safe distance from the vehicle in front of the adaptive cruise control .
Rear Traffic Warning (RCTA) : microwave radar can monitor the traffic behind the vehicle, remind the driver to pay attention to the coming car, to avoid reversing collision .
The working principle of microwave radar is to measure the position of the target by sending wireless waves (radar waves) and receiving the echo according to the time difference between the sending and receiving. The frequency of millimeter wave radar is in the millimeter wave band, so it is called millimeter wave radar .
The application of different frequency bands of microwave radar in automobiles includes two bands of 24GHz and 77GHz. 24GHz radars are mainly used for short-range detection, while 77GHz radars have higher resolution and smaller size, suitable for longer range detection .
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