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保持适当的车距是安全行车的重要保证,最近日本日立公司和美国伊顿·伯拉德公司联合开发成功了车用毫米波雷达,它能够在各种气象条件下准确测量出自身车辆与前方车辆之间的距离,帮助驾驶员及时调整车距,提高汽车行驶安全性,受到专家的关注.车用测距雷达早在几年前就已问世,它们一般使用激光或红外线测距技术,但遇到下雨或大雾等恶劣天气时,由于激光和红外线的穿透能力弱,导致无法使用.毫米波雷达采用的是波长在1cm以下、频率30GHz以上的高频电磁波(即毫米波),它的波长短,沿直线传播且穿透性好,几乎不受气象
Maintaining a proper distance is an important guarantee for safe driving. Recently, Japan’s Hitachi and Eaton Co., Ltd. of the United States jointly developed a millimeter-wave radar for vehicles that can accurately measure its own vehicles and vehicles in front of each other under various weather conditions Distance between the driver to help adjust the car in time to improve vehicle safety by experts attention. Vehicle ranging radar as early as a few years ago has come out, they generally use laser or infrared ranging technology, but the case of To bad weather such as rains or fog, it is unusable due to the weak penetrating power of laser and infrared rays, and the millimeter-wave radar uses the high-frequency electromagnetic wave (ie, millimeter wave) with the wavelength below 1cm and the frequency above 30GHz The short wavelength, along a straight line and good penetration, almost weather-free