"Beidou" double satellite positioning system, adopting two geosynchronous satellites to position, has the characteristic of high precision in positioning and active positioning mechanism.
北斗双星定位系统(简称双星定位)利用两颗地球同步卫星进行定位，具有定位精度高、采用有源定位体制的特点。
The characteristics, function, structure and principle of the BeiDou Dual-Satellite Navigation System are described, and the limitation of the BeiDou's active location in application is discussed.
介绍了北斗双星定位系统的特点、功能、系统组成和工作原理，说明了北斗有源定位方式在应用方面的局限性。
At present, the meteorological satellite plays the most important role in the earth-atmosphere monitoring system, whereas satellite meteorology is a very active field in the earth science.
目前，气象卫星已经成为地球大气探测系统中的主要成员，而卫星气象学则正在覆盖地球系统科学中的主要方面。
Satellite measurements of the icy surface of Antarctica have detected an active system of lakes under ice that is about one kilometer deep.
人造卫星的观测显示，南极洲的冰层下面有很多活水湖，深达一公里。
Satellite measurements of the icy surface of Antarctica have detected an active system of lakes under ice that is about one kilometer deep.
人造卫星的观测显示，南极洲的冰层下面有很多活水湖，深达一公里。
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