明年该局还计划测试一套以卫星定位为基础的收费系统，这样就不用建立公路收费站，只需根据特定时段这条公路的拥挤状况来进行收费。

And next year it plans to test a satellite-based system that does not require gantries and can charge according to how congested a road is at that particular time.

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太阳风暴威胁着所有的围绕地球运行的人造天体，包括GPS定位和通讯卫星，载人航天飞机和国际空间站。

Solar flares threaten all of the artificial objects orbiting our planet including GPS and telecommunications satellites occupied spacecraft and the International space Station.

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实现区域快速无源导航定位，需要至少四个伪卫星站提供的导航信号。

To bring about local navigation and position, it at least requires navigation signals from four pseudo satellite stations.

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