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什么是北斗导航系统

What is BeiDou?

发表于:2013-08-26 23:02:19 作者:SOTEN 文章总浏览数:

 

What is BeiDou?
 
BeiDou (sometimes known as as “Compass”) is the name of the Chinese Global Navigation Satellite System. China has indicated it intends to expand the current local geostationary system (BeiDou phase 1) into a fully global medium-earth-orbit GNSS constellation (BeiDou phase 3), via an interim step of a regional system using both geosynchronous (Geo) and inclined Geo (IGSO) satellites. Phase 2, or BeiDou-2, is now operating and the Signal In Space Interface Control Document for the B1 in-phase component was issued at version 1.0 in December 2012.
The first phase of BeiDou, known as BeiDou 1, is an experimental system comprising three payloads on geosynchronous satellites. This phase provides wide area precise positioning and is substantially a China-only system in terms of access and users.
The second phase, BeiDou-2, is not a development of BeiDou 1 but is an entirely new regional system of 5 GEO, 5 IGSO and 4 MEO satellites broadcasting on 3 frequencies. This phase lays the foundation for final stage 3 which is a global system based around 5GEO, 3IGSO and 27MEO satellites which orbiting the earth every 12 hours or so will provide global coverage.
The constellation structure will be similar to the European Galileo network and the ranging signals are based on the CDMA principle, like GPS and Galileo. In line with other GNSS, there will be two levels of positioning service: Open and restricted.
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北斗(有时也被称为是“北斗”)是中国全球导航卫星系统的名称。中国已表示它打算扩大当前的本地静止系统(北斗一期)成一个完全的全球中等地球轨道导航卫星系统星座(北斗第3阶段),通过同时使用地球同步轨道(GEO)的区域系统的过渡步骤和倾斜GEOIGSO)卫星。第2阶段,或北斗2,现经营和信号在空间接口控制文件为B1的同相分量已于201212月发行的版本为1.0
北斗的第一阶段,称为北斗1,是一个实验系统,包括对地球同步卫星3有效载荷。这一阶段提供广域精确定位并且基本上以中国为唯一的系统的接入和用户方面。
第二阶段,北斗2,是不是北斗1的发展,而且是5GEO),在3个频率5 IGSOMEO4卫星广播一个全新的区域系统。这一阶段奠定了最后阶段3的基础是围绕5GEO3IGSO27MEO的卫星绕地球每12小时左右将提供覆盖全球的全球系统。
星座结构将类似于欧洲伽利略网络和所述测距信号是基于CDMA原理,如GPS和伽利略。在与其他GNSS线,将有两个级别的定位服务的:打开和限制。

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