Wilton L. Virgo: 智能手机如何定位位置? - Wilton L. Virgo

智能手机如何定位位置? - Wilton L. Virgo

观看完整课程：http://ed.ted.com/lessons/how-does-your-smartphone-know-your-location-wilton-l-virgo

智能手机中的GPS定位应用程序方便人们查询旅行路线和找到附近的活动地点。 不过你的手机是怎么知道你在哪里的呢？Wilton L. Virgo 揭示了答案：就在你头顶1万9千多公里的高空中，利用一个绕地卫星上以量子力学为基础的原子钟来精确定位时间。 

授课：Wilton L. Virgo, 动画： Nick Hilditch.

Every time a smartphone pinpoints its location, it relies on satellites 12,000 miles above, synchronizing time using atomic clocks powered by quantum mechanics. These clocks are so precise, they would not lose or gain a single second in 300 million years. By measuring how long radio signals take to travel from multiple satellites, and using Einstein’s relativity, GPS can locate a device to within a few dozen feet. This remarkable system blends quantum leaps, atomic oscillations, and a global satellite network to map the world in real time.