GPS工作原理

全球定位系统 "GPS" redirects here. For other uses, see GPS (disambiguation). For a generally accessible and less technical introduction to the topic, see Introduction to the Global Positioning System. “GPS“重定向。gps的原理作为其他用途，请见（GPS 解疑）。作为对这个主题一般普通的和较低技术上的介绍，请见：全球定位系统介绍。 The Global Positioning System (GPS) is a space-based global navigation satellite system that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth there is an unobstructed line of sight to four or more GPS satellites. It is maintained by the United States government and is freely accessible by anyone with a GPS receiver. 全球定位系统是一个以空间为基础的全球卫星导航系统，可以全天候一直在任何地点位于或邻近地球在四个或更多GPS 卫星畅通无阻线路范围内提供可靠的位置和时间信息。

它是由美国政府维护并且任何持有GPS 的人都可以免费的接受信息。 The GPS System was created and realized by the U.S. Department of Defense (DOD) and was originally based on and run with 24 satellites. It was established in 1973 to reduce the large number of navigation aids and to overcome the limitations of previous navigation systems. 全球定位系统由美国国防部创建并付诸实践，最初建立在 24 枚卫星运行的基础之上。 它建立与 1973 年，减少了大量的导航设备并克服了先前导航系统的局限。 Basic concept of GPS 全球定位系统的基本概念 A GPS receiver calculates its position by precisely timing the signals sent by the GPS satellites high above the Earth. Each satellite continually transmits messages which include 全球定位系统通过在地球之上的全球定位系统卫星上发出信号的精准时间来计算它的位置。

每枚卫星不断地传送以下信息： the time the message was transmitted  precise orbital information (the ephemeris) the general system health and rough orbits of all GPS satellites (the almanac).  消息被传送的时间  精确轨道信息(星历表)  一般系统状态和所有全球定位系统卫星的概略轨道(年历)。  The receiver utilizes the messages it receives to determine the transit time of each message and computes the di...

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