Automotive radar anti-collision system: definition and composition of automobile anti-collision system
CCAS is the abbreviation of "automobile anti-collision system", that is, "automobile anti-collision system"
Anti-collision radar device, that is, automobile anti-collision system, is an intelligent device to avoid automobile collision. It can automatically detect cars, pedestrians or other obstacles that may collide with cars, and at the same time give an alarm or take measures such as braking and avoiding to prevent collisions.
Brief introduction of digital signal processing
DSP is a low-cost but high-performance chip. It converts the received signal (from radar) into a digital signal and sends it to the computer, so that the computer can calculate and judge the distance. Different from the current reversing radar on the market, it must calculate accurately and brake automatically. This chip is also moving towards autonomous driving!
Digital signal processor is a kind of microprocessor. This microprocessor has extremely high processing speed.
The existence of DSP has greatly promoted the research of automobile anti-collision radar technology, making it possible for automobile anti-collision radar system to be realized in ordinary cars and spread all over the country.
Automotive radar Collision Avoidance System: Different Detection Methods
1. laser mode
Laser has the characteristics of high monochromaticity, strong directivity and good coherence, so the laser beam is almost linear, with less diffusion, concentrated wave velocity and energy and long transmission distance. When laser detection technology is used in automobile collision avoidance, its working principle is: first, the laser beam emitted by the laser radar equipped with the vehicle irradiates the reflector of the preceding vehicle, then the arrival time of the reflected laser speed is checked, and the distance between the two vehicles is judged according to the time difference between the laser beam emission and the return.
The measurement accuracy of laser ranging is very high, and the technology has made great progress. However, in the field of automobile collision avoidance, the application of laser ranging has its limitations. The key point is that the laser ranging method is closely related to weather conditions, car vibration, reflection surface wear and pollution, and the ranging accuracy is difficult to guarantee. Therefore, the laser ranging method has not been developed in the field of automobile collision avoidance.
2. Ultrasonic mode
As a special sound wave, ultrasonic wave also has the basic physical characteristics of sound wave propagation. Mdash & ampMdash Reflection, refraction, interference, etc. Ultrasonic ranging is based on its reflection characteristics, and its working principle is basically similar to sonar echo positioning. The ultrasonic transmitter continuously emits ultrasonic waves with a certain frequency, which will be reflected when it meets the measured object. After receiving the reflected signal, the ultrasonic receiver converts it into an electrical signal, and then measures the time difference between the transmitted wave and the reflected wave, and the distance can be obtained according to the sound speed. However, the biggest problem of ultrasonic ranging is the short detection distance, which is closely related to weather conditions, so the key of ultrasonic ranging is used in short-range ranging such as reversing radar.
3. Infrared mode
In principle, infrared ranging is basically similar to laser and ultrasonic ranging, and both judge the distance of the target according to the transmitted wave and reflection time. Infrared ranging technology is not difficult and the cost of ranging system is low, but it still can't meet the requirements of vehicle collision avoidance and long-distance detection in bad weather.
4. Millimeter wave mode
Millimeter wave refers to the electromagnetic wave with the wavelength between110 mm. The principle of millimeter wave radar ranging is similar to the above method, but it overcomes the shortcomings of other detection methods in automobile collision avoidance application.
This concludes the introduction of Bian Xiao Auto today. The above is a brief introduction of Bian Xiao Automobile to automotive radar anti-collision system. It seems that few people can understand this point, which is quite common in our daily life at present. Therefore, I hope that the brief introduction of Bianxiao Automobile can solve the problem for you. If you want to know more, please pay attention to Bian Xiao Auto.
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