To avoid treading on the toes of TV broadcasters, his system uses GPS to determine its location; then it checks the Web to find out what stations are active in the area.
为了避免影响到电视播出机构，他的系统使用GPS来确定自己的位置；然后它对Web进行检测，以便找出该地区活跃的电视台有哪些。
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。
Abstract: at present, China's Beidou geostationary satellites positioning system can only achieve two-dimensional active location, which greatly limits its application.
摘要目前中国的“北斗”双星定位系统只能实现二维有源定位，大大限制了该系统的应用。
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