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单词互译：broadcast ephemeris：（）precise ephemeris：（） Coarse/Acquisition Code (C/A code)：（）精码：（）伪距：（）Ionospheric delay：（）tropospheric delay：（）多路径效应：（）Selective Availability (SA)：（）

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单词互译：基准接收机：（）流动接收机：（）receiver antenna：（）实时动态定位：（）differential GPS (DGPS) ：（）差分改正：（）real-time differential correction ：（）post-processed differential correction：（）

The GPS system consists of three segments: ⑴( ): the GPS satellites themselves;⑵( ):operated by the U .S. military;⑶( ): which includes both military and civilian users and their GPS equipments.

What Is GPS？

What are the GPS Error Sources？