无人驾驶车辆的雷达传感

　　无人驾驶车辆的雷达传感

　　传感器是无人驾驶车辆的关键部件。能够监视车辆前方、后方或侧面的距离，为中央控制器提供重要的数据。光学和红外摄像机，激光，超声波和雷达都可以用来提供有关周围环境，道路和其他车辆的数据。例如，照相机可以用来检测道路上的标记以使车辆保持在正确的车道上。这已经是用来在一个先进的驾驶辅助系统（ADAS）提供车道偏离警告。今天的ADAS系统也使用雷达用于碰撞检测的警告和自适应巡航控制系统，车辆可以跟随前车。

　　Without the input of a driver， autonomous vehicles require many more sensor systems， often using multiple inputs from different sensors to provider a much higher level of assurance. These sensor systems are adapting from the proven ADAS implementations， although the system architecture is changing to manage the wider range of sensors and the higher data rates.

　　The cost of 24 GHz radar sensors is falling with the increased adoption of the ADAS systems that are used for adaptive cruise control and collision detection. These are now becoming a requirement for carmakers to achieve the highest five star NCAP safety rating in Europe.

　　The BGT24M 24GHz radar sensor from Infineon Technologies， for example， can be used with an external microcontroller in an electronic control unit （ECU） to modify the throttle to maintain a constant distance from the car in front with a range of up to 20 m， as shown in Figure 1