The Role of the Clock in a GPS Receiver
The Role of the Clock in a GPS Receiver
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时钟在 GPS 接收器中的作用
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发表时间：
2016
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通讯作者：
P. Misra
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作者：
P. Misra
听起来有点奇怪，但测量距离最精确的方法是使用时钟。时间是最难定义的量，但却是我们知道如何最精确测量的量。事实上，米的长度是通过真空中光速的采用值，以秒的长度来定义的。这种基本关系（距离 = 速度 X 时间）是 CPS 工作原理的核心。通过测量信号从卫星传播到接收器所用的时间并将其乘以光速，CPS 接收器可以确定到卫星的范围。但有一个问题。接收器时钟的计时能力中的任何误差都会反映在计算范围内。在本月的专栏中，位于马萨诸塞州列克星敦的麻省理工学院林肯实验室的高级工作人员 Pratap Misra 博士将回顾时钟在 CPS 接收器中的作用及其性能对 CPS 位置精度的影响。 《创新》是《GPS World》的定期专栏，主要讨论 CPS 技术及其应用的最新进展以及 CPS 定位的基本原理。该专栏由新不伦瑞克大学大地测量与测绘工程系的 Richard Langley 和 Alji"ed Kleusberg 负责协调，他们非常感谢您的评论以及对未来专栏主题的建议。要与他们联系，请参阅本期第 4 页的“专栏作家”部分。
It sounds a little strange but the most precise way of measuring a distance is to use a clock. Time, the quantity most difficult to define, is the one we know how to measure most precisely. In fact, the length of the meter is defined in terms of the length of the second through the adopted value of the speed of light in a vacuum. It is this fundamental relationship (distance= speed X time) that is at the heart of how CPS works. By measuring the time elapsed for a signal to propagate from a satellite to a receiver and multiplying it by the speed of light, a CPS receiver can determine the range to the satellite. But there's a hitch. Any error in the time-keeping capability of the receiver 's clock will be reflected in the co1nputed range. In this month's column, Dr. Pratap Misra, senior staff member of the Massachusetts Institute of Technology's Lincoln Laboratory in Lexington, Massachusetts, will review the role of the clock in a CPS receiver and the effect its performance has on CPS position accuracy. "Innovation " is a regular column in GPS World featuring discussions on recent advances in CPS technology and its applications as well as on the fundm:tentals of CPS positioning. The column is coordinated by Richard Langley and Alji"ed Kleusberg of the Department of Geodesy and Geomatics Engineering at the University of New Brunswick, who appreciate receiving your comments as well as suggestions of topics for future columns. To contact them, see page 4 of this issue, under the "Columnists" section.