This paper analyzes the components and features of GPS, discusses differential dynamic positioning technology with GPS in real time and its error sources.

分析了全球定位系统GPS的组成及功能，探讨了GPS实时差分动态定位技术及其误差来源。

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The result of positioning precision test shows that the positioning precision of the GPS real time differential system based on GPRS has attained cm-level.

实际测试结果表明：基于GPRS的GPS实时差分系统达到了厘米级定位精度。

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