China’s Beidou satellite navigation system (BDS) is a global satellite navigation system developed by China itself. It is also the third mature satellite navigation system after GPS and GLONASS. Beidou satellite navigation system (BDS), GPS of the United States, GLONASS of Russia and Galileo of the European Union are the suppliers recognized by the United Nations satellite navigation Committee.
中国北斗卫星导航系统（英文名称：BeiDou Navigation Satellite System，简称 BDS）是中国自行研制的全球卫星导航系统，也是继 GPS、GLONASS 之后的第三个成熟的卫星导航系统。北斗卫星导航系统（BDS）和美国 GPS、俄罗斯 GLONASS、欧盟 GALILEO，是联合国卫星导航委员会已认定的供应商。
China’s Beidou navigation satellite system (BDS) is a global satellite navigation system developed by China itself. It is also the third mature satellite navigation system after GPS and GLONASS. Beidou satellite navigation system (BDS), GPS of the United States, GLONASS of Russia and Galileo of the European Union are the suppliers recognized by the United Nations satellite navigation Committee.
北斗卫星导航系统由空间段、地面段和用户段三部分组成，可在全球范围内全天候、全天时为各类用户提供高精度、高可靠定位、导航、授时服务，并且具备短报文通信能力，已经初步具备区域导航、定位和授时能力，定位精度为分米、厘米级别，测速精度 0.2 米/秒，授时精度 10 纳秒。
Beidou satellite navigation system is composed of three parts: space segment, ground segment and user segment. It can provide all kinds of users with high-precision and reliable positioning, navigation and time service all day and all day around the world. It also has short message communication capability. It has preliminary regional navigation, positioning and time service capabilities. The positioning accuracy is decimeter and centimeter level, and the speed measurement accuracy is 0.2 M / s, and the time service accuracy is 10 nanoseconds.
2020 年 7 月 31 日上午，北斗三号全球卫星导航系统正式开通。
On the morning of July 31, 2020, the beidou-3 global navigation satellite system will be officially opened.
Beidou satellite navigation system (hereinafter referred to as Beidou System) is a satellite navigation system built and operated independently by China to meet the needs of national security and economic and social development. It is an important national space infrastructure that provides all-weather, all-time, high-precision positioning, navigation and timing services for global users.
With the development of Beidou system construction and service capacity, related products have been widely used in transportation, marine fishery, hydrological monitoring, weather forecast, surveying and mapping geographic information, forest fire prevention, communication timing, power dispatching, disaster relief, emergency search and rescue, and gradually penetrated into all aspects of human social production and people’s life, injecting new energy into global economic and social development New energy.
Satellite navigation system is a global public resource, multi system compatibility and interoperability has become the development trend. China China has always adhered one’s own to one belt, one road, the other is the development of the “Beidou and the Beidou”, and actively promoted the international cooperation of the Beidou system. Join hands with other satellite navigation systems, and work with various countries, regions and international organizations to jointly promote the development of global satellite navigation, so that the Beidou system can better serve the world and benefit mankind.
To build a world-class satellite navigation system to meet the needs of national security and economic and social development and provide continuous, stable and reliable services for global users; to develop the Beidou industry to serve economic and social development and the improvement of people’s livelihood; to deepen international cooperation, share the achievements of satellite navigation development and improve the comprehensive application efficiency of global satellite navigation system.
autonomy. Adhere to the independent construction, development and operation of the Beidou system, and have the ability to independently provide satellite navigation services to global users.
to open up. We will provide free and open satellite navigation services and encourage all-round, multi-level and high-level international exchanges and cooperation.
Compatible. We should promote compatibility and interoperability with other satellite navigation systems, encourage international exchanges and cooperation, and strive to provide better services for users.
gradual. Step by step promote the construction of Beidou system, continuously improve the service performance of Beidou system, and continuously promote the comprehensive, coordinated and sustainable development of satellite navigation industry.
Beidou system consists of three parts: space segment, ground segment and user segment.
The space segment consists of several geostationary orbit satellites, tilted geosynchronous orbit satellites and mid circle earth orbit satellites.
The ground section includes several ground stations such as master control station, time synchronization / injection station and monitoring station, as well as inter satellite link operation and management facilities.
The user segment includes basic products such as chips, modules and antennas compatible with Beidou and other satellite navigation systems, as well as terminal equipment, application systems and application services.
Beidou augmentation system includes ground-based augmentation system and satellite based augmentation system.
北斗地基增强系统是北斗卫星导航系统的重要组成部分，按照“统一规划、统一标准、共建共享”的原则，整合国内地基增强资源，建立以北斗为主、兼容其他卫星导航系统的高精度卫星导航服务体系。利用北斗/GNSS 高精度接收机，通过地面基准站网，利用卫星、移动通信、数字广播等播发手段，在服务区域内提供 1-2 米、分米级和厘米级实时高精度导航定位服务。系统建设分两个阶段实施，一期为 2014 年到 2016 年底，主要完成框架网基准站、区域加强密度网基准站、国家数据综合处理系统，以及国土资源、交通运输、中科院、地震、气象、测绘地理信息等 6 个行业数据处理中心等建设任务，建成基本系统，在全国范围提供基本服务；二期为 2017 年至 2018 年底，主要完成区域加强密度网基准站补充建设，进一步提升系统服务性能和运行连续性、稳定性、可靠性，具备全面服务能力。
Beidou ground-based augmentation system is an important part of Beidou satellite navigation system. According to the principle of “unified planning, unified standards, co construction and sharing”, we should integrate domestic ground-based augmentation resources and establish a high-precision satellite navigation service system based on Beidou and compatible with other satellite navigation systems. Beidou / GNSS high-precision receivers are used to provide 1-2m, decimeter and centimeter level real-time high-precision navigation and positioning services in the service area through the ground reference station network, satellite, mobile communication, digital broadcasting and other broadcasting means. The first phase is from 2014 to the end of 2016, which mainly includes the frame network reference station, regional enhanced density network reference station, national data comprehensive processing system, as well as land and resources, transportation, Chinese Academy of Sciences, earthquake, meteorology, surveying and mapping geographic information The second phase is from 2017 to the end of 2018, mainly to complete the supplementary construction of regional density network benchmark station, further improve the system service performance and operation continuity, stability, reliability, with comprehensive service capacity.
北斗星基增强系统北斗卫星导航系统的重要组成部分，通过地球静止轨道卫星搭载卫星导航增强信号转发器，可以向用户播发星历误差、卫星钟差、电离层延迟等多种修正信息，实现对于原有卫星导航系统定位精度的改进。按照国际民航标准，开展北斗星基增强系统设计、试验与建设。目前，已完成系统实施方案论证，固化了系统在下一代双频多星座（DFMC）SBAS 标准中的技术状态，进一步巩固了 BDSBAS 作为星基增强服务供应商的地位。
Beidou satellite based augmentation system is an important part of Beidou satellite navigation system. Through the geostationary orbit satellite equipped with satellite navigation augmentation signal transponder, it can broadcast a variety of correction information to users, such as ephemeris error, satellite clock error, ionospheric delay and so on, so as to improve the positioning accuracy of the original satellite navigation system. According to the international civil aviation standards, the design, test and construction of Beidou satellite based augmentation system were carried out. At present, the demonstration of system implementation scheme has been completed, the technical status of the system in the next generation dual band multi constellation (DFMC) SBAS standard has been solidified, and the position of bdsbas as as a satellite based enhancement service provider has been further consolidated.