全球定位系统(GPS)是为用户提供免费而精确的经度，纬度和海拔三维位置信息与时间信息的无线电导航系统。
Global Positioning system (GPS) is a radio navigation system which provides free users with accurate longitude, latitude and elevation of three-dimensional position information and time information.
全球定位系统（GPS）是为用户提供免费而精确的经度，纬度和海拔三维位置信息与时间信息的无线电导航系统。
The theory of the realization of global position system(GPS) receiver is studied in this paper, and the simple mathematical model is also introduced.
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