One of the important factors affecting the accuracy of two-way satellite time and frequency transfer (TWSTFT) is the satellite motion.

影响双向卫星时间频率比对(TWSTFT)准确度的一个重要因素是卫星的运动。

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So the GRACE satellite time-variable gravity field can only determine water storage variation over thousands kilometers or more with high accuracy presently.

可见，当前GRACE卫星时变重力场只能确定出上千公里及以上尺度区域的水储量变化。

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There are two primary methods of time dissemination around the world: two-way satellite time transfer_(TWSTT) and common-view Global Position System_(GPS) time transfer.

现行的高精度远距离时间传递方式主要有GPS共视法和双向卫星时间传递技术（TWSTT）。

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In addition, senior economic officials will be doing regional satellite time into key targeted states in advance of the vote.

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We were deep indoors though, so native GPS wasn't working and we couldn't get a clear idea of satellite acquisition time.

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