The millimeter wave radar has a long transmission distance, and the atmospheric attenuation and loss are low in the transmission window, and the penetration is strong. The automobile millimeter wave radar sensor can meet the requirements of the vehicle's adaptability to the weather throughout the day, and the characteristics of the millimeter wave itself determine the small size and light weight of the millimeter wave radar sensor device. It makes good use of other sensors such as infrared, laser, ultrasonic, camera, etc., which are not available in automotive applications.
Domestic and international mainstream automotive millimeter wave radar frequency bands are 24GHz (for short to medium range radar, 15-30 meters) and 77GHz (for long range radar, 100-200 meters). Although the wavelength of 24Ghz exceeds 1cm, it is 12.5mm long. Generally, the radar near this wavelength is called microwave radar, also called millimeter wave radar. The 24Ghz radar is less linear than the 77Ghz, but the surrounding metal is also detectable. With reference to such characteristics, vehicle detection around the vehicle uses 24 Ghz, and front vehicle detection uses 77 GHz.
Comparison of millimeter wave radar and other sensing technologies
Ultrasonic camera infrared laser radar millimeter wave radar
The advantage structure is simple, the price is cheap, the volume is small, the cost is moderate, the size and distance of the obstacle can be distinguished, and the pedestrian can be identified as low cost, the nighttime is not affected, the distance measurement is high, the direction is strong, the response is fast, and the ground clutter is not affected. Affected by weather conditions and nighttime effects, it can detect distant objects (more than 100 meters)
The disadvantages are affected by weather and temperature changes. The maximum measurement distance is only a few meters, which is affected by the visual field as well as the human eye. It will also be affected by bad weather and will be limited by weather conditions. It can only detect close-range objects, and it is difficult to identify pedestrians. Can't work all day, in the case of dense fog, rain, can't work, the cost is higher, the pedestrian's reflected wave is weak, it is difficult to detect
Automotive millimeter-wave radar sensors are favored by major automakers because of their strong resistance to environmental interference and high stability. Such applications have become popular in Europe, the United States and Japan. At present, almost all cars in these regions are equipped with automotive millimeter-wave radar sensors, including automobile collision avoidance radars and vehicle blind zone detection radars.
　　
Automotive millimeter wave radar sensor market size
In the field of active safety of automobiles, automotive millimeter-wave radar sensors have become the industry's recognized mainstream choice because they can work around the clock and are not affected by bad weather such as light, fog, dust storms, etc., and have huge market demand, and thus are currently the automotive electronics manufacturers. The main research and development direction.
In 2014, the global automotive millimeter wave radar market shipped 19 million units. According to market research firm Plunkeet Research, it is estimated that by 2010, there will be nearly 70 million global vehicle millimeter wave radars, and the compound growth rate of 2015-2020 is about 24%. .
China is the world's largest automobile production and consumption country. In 2015, China's automobile market has reached 170 million vehicles (including 125 million private cars), and will grow rapidly in the future with an annual growth rate of nearly 20 million vehicles. The Chinese auto market accounts for more than 30% of global auto sales, but the ADAS share is significantly lower than 30%. With the upgrading of consumption structure and the increase in demand for middle-class car purchases, the demand for ADAS based on millimeter-wave radar will show explosive growth in the future.
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