The spot - beam design in the satellite - based cellular communication systems is discussed mainly.

摘要讨论了卫星蜂窝通信系统的点波束设计.

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But even the new satellite - based radar images still need fine - tuning.

不过即使是新型卫星雷达图像仍有待调整.

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Radio and satellite - based navigation systems have greatly reduced the need for large lighthouses in sighting land.

无线电和卫星导航系统已大为降低了对在可视陆地范围内建大型灯塔的需要.

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Satellite based viewing ( up to and including the monitoring of writings as they are written; indoors )

基于卫星的侦察 ( 达到了包括监测当他们在屋里写字时写的 东西 )

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GPS - Global Positioning System - A satellite - based navigation unit that can be accurate to 10 m.

全球定位系统一套以卫星做为定位系统的导航装备精确度可达十公尺.

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