The reference station needs to monitor and receive the high-accuracy navigation signal in the wide area DGPS, and to get more accuracy data of pseudo-range observation.

在GPS广域差分系统中，参考站需要进行高精度导航信号监测接收，并获得良好的伪距观测数据。

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F-18 accidentally bombed one of its own observation towers on the firing range.

ECONOMIST: Weapons testing

Such events occur, he says, because the rules we infer from the observation of events never contain the full range of possibilities.

FORBES: Chaos Theory, Financial Markets, and Global Weirding

Mr. Magill's range is extraordinary, and his wit, erudition and powers of observation give credence to judgments that might otherwise strike us as just a tad, well, insincere.

WSJ: Book Review: Sincerity