到目前为止，中国已经完成了北斗卫星导航系统的第三代网络系统，这是国家空间研究工作一个新的里程碑。
So far, China has completed the third generation network of China's BDS. It was a new milestone in the nation's space research work.
北斗导航系统成为第三个面向国际航海应用的全球卫星导航系统。
The Beidou navigation Satellite System has become the third GNSS applied in international navigation.
本论文分析了基于北斗导航定位系统的三星定位系统总体结构和工作原理，对卫星导航中与定位精度有关的部分进行了研究。
This thesis analyzes the principle and architecture of three-star navigation system based on "Beidou" system and investigates the problems related with positioning precision.
本文在北斗双星有源定位系统的基础上进行了三星无源定位的研究。
Basing on the Double star Active Positioning System, this article conducted the research on the Beidou Tri-star Passive Positioning System.
北斗系统由空间段、地面段和用户段三部分组成。
The BDS is mainly comprised of three segments: space segment, ground segment and user segment.
——第三步，建设北斗全球系统。
它走得很慢，它想，只要找到真正向北的方向，只要不迷路，用不了三天，一定会找到水和食物的。于是，它白天不急于赶路，而是休息。 晚上，天空中挂满了亮晶晶的星星，骆驼很容易地找到了那颗耀眼的北斗星。
It walked slowly, it thought, it would be able to find water and food in less than three days if it find the real direction so, it wasn't worry to . travel in the day, but having a rest.
第三步，2020 年左右，建成由30余颗卫星组成，覆盖全球的北斗全 球卫星导航系统，系统性能达到同期国际先进水平。
The third step, about 2020, built by more than 30 satellites, global coverage Compass global satellite navigation system, the system performance over the same period the international advanced level.
第三步，2020 年左右，建成由30余颗卫星组成，覆盖全球的北斗全 球卫星导航系统，系统性能达到同期国际先进水平。
The third step, about 2020, built by more than 30 satellites, global coverage Compass global satellite navigation system, the system performance over the same period the international advanced level.
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