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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：（）

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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？

句子翻译（手写并拍照上传）：The high altitude insures that the satellite orbits are stable, precise and predictable, and that the satellites’ motion through space is not affected by atmospheric drag.