本帖最后由 Florastar 于 2011-10-16 20:10 编辑
英语老师布置了一项作业，查询有关某篇文章里面的背景知识。主要是讲智能汽车的……
关于下面这一句的原理，我实在是查不到也弄不懂啊……“通过将方向盘的转动与汽车在地图上的位置并置来测定汽车的方位”这是怎么做到的？原理是什么？
有点小急，百度谷歌CNKI均未果后想起了万能的牧夫……真心请教各位大神……谢谢谢谢~~~
以下为原文节选，LZ主要弄不懂的是中间红色那段：
As a satellite passes overhead, it sends out a radio signal that can be detected by a receiver in a car's computer. The car's computer can then calculate how far the satellite is by measuring how long it took for the signal to arrive. Since the speed of light is well known, any delay in receiving the satellite's signal can be converted into a distance.
卫星从高空经过时发出能被汽车上计算机里的接收器辨认的无线电信号。汽车上的计算机就会根据信号传来所花的时间计算出卫星有多远。由于光速为人熟知，接收卫星信号时的任何时间迟缓都能折算出距离的远近。
In Japan there are already over a million cars with some type of navigational capability. (Some of them locate a car's position by correlating the rotations in the steering wheel to its position on a map.)
在日本，具有某种导航能力的汽车已有一百万辆之多。（有些导航装置通过将方向盘的转动与汽车在地图上的位置并置来测定汽车的方位。）
With the price of microchips dropping so drastically, future applications of GPS are virtually limitless. "The commercial industry is poised to explode," says Randy Hoffman of Magellan Systems Corp. , which manufactures navigational systems. Blind individuals could use GPS sensors in walking sticks, airplanes could land by remote control, hikers will be able to locate their position in the woods -- the list of potential uses is endless.
随着微芯片价格的大幅度下降，未来对全球卫星定位系统的应用几乎是无限的。“制造这一商品的工业定会飞速发展，”生产导航系统的麦哲伦航仪公司的兰迪·霍夫曼说。盲人可以在手杖里装配全球卫星定位系统传感器，飞机可以通过遥控着陆，徒步旅行者可以测定自己在林中的方位—其潜在的应用范围是无止境的。
|
置顶卡
变色卡
千斤顶
显身卡