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Global positioning system(GPS)

全球定位系统：美国政府国防部通过24颗人造卫星构成全球定位系统。每颗卫星绕行地球一周约需11小时58分,地球上任何一个位置,均有4颗以上的卫星可以实施观测,可以提供在全世界地面有接收设备的人精准的经度和纬度数值,所以使用者可以知道他所在的位置。运输业可在车上装置接收器,以掌握车辆的行踪。

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Release time: 2016-08-08 00:00

Update time: 2016-08-08 00:00

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