这些汽车利用一套包括视频摄像机、雷达传感器和激光测距仪在内的控制系统侦测道路上的其他车辆，同时按照由普通汽车驾驶员制定的预先设定路线行驶。
They use a system of video cameras, radar sensors and laser range-finders to detect other vehicles, while following a pre-set route mapped out by drivers in ordinary cars.
如谷歌自己所解释的那样，谷歌最近出品的无人驾驶汽车使用了摄像机、雷达探测器和激光测距仪来“看”前后左右的交通情况，并通过详细的地图来指引汽车在路上行驶。
As Google explains it, its automated cars use video cameras, radar sensors and a laser range finder to "see" other traffic and detailed maps to navigate the road ahead.
此前对于极地地区的卫星调查使用的是雷达测距技术，在对地球表面进行测绘时难以达到此次ICE卫星的激光测距仪的精度。
Polar regions have relied upon radar measurements that cannot map the Earth's surface with the same precision as the ICESat laser rangefinder.
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