A Brief Introduction Of Beidou Satellite Navigation System
(a) overview
Beidou satellite navigation system (COMPASS) / BeiDou Navigation SatelliteSystem: is a global satellite navigation system, autonomous development, China is implementing the independent operation of the. The system construction goalis: to build a global coverage of the Beidou satellite navigation system stand on one's own, open and compatible, advanced technology, stable and reliable,promote the satellite navigation industry chain formation, improve the formation of national satellite navigation application industry support, promote andguarantee system, to promote the wide application of satellite navigation in the national economic and social sectors.
Beidou satellite navigation system by the space segment, ground and user segments of three parts, the space segment consists of 5 geostationary orbitsatellite and 30 non geostationary orbit satellite, the ground segment includesmaster station, injection and monitoring stations in several ground stations, the user segment includes terminal compatible with the user terminal and other satellite navigation system the.
(two) development
Satellite navigation system is an important spatial information infrastructure.China attaches great importance to the construction of satellite navigation system, satellite navigation system has independent intellectual property rights in an effort to explore and develop. In 2000, built the first compass navigation testsystem, make our country become the United States, Russia, after the world'sthird country with autonomous navigation satellite system. The system has been successfully applied in surveying and mapping, telecommunications, water conservancy, fishery, transportation, forest fire prevention, disaster relief and public security and other fields, have a significant economic benefit and social benefit. Especially in the 2008 Beijing Olympic Games, Wenchuan earthquake relief has played an important role in the. In order to better serve the national construction and development, to meet the global demand, China started to implement the construction of Beidou satellite navigation system.
(three) the construction principle
The construction and development of the Beidou satellite navigation system, in order to promote the application and industrial development as the basic goal,not only to build the system, but to use the system, emphasis on quality, safety,efficiency, application, follow the following principles:
1, open. Construction, the Beidou satellite navigation system development andapplication will be open to the world, to provide high quality free services tousers worldwide, and actively carry out exchanges and cooperation with all countries in the world wide and deep, the satellite navigation system to promote the compatibility between, promote the development of satellite navigationtechnology and industry.
2, autonomy. China will self construction and operation of Beidou satellite navigation system, the Beidou satellite navigation system can provide the globaluser service independence.
3, compatibility. The International Committee on global navigation satellite system (ICG) and the International Telecommunication Union (ITU) framework,the Beidou satellite navigation system and the satellite navigation system to realize the compatibility and interoperability, so that all users can enjoy the fruits of development of satellite navigation.
4, the gradual. China will actively and steadily push forward the construction and development of the Beidou satellite navigation system, and constantly improve the service quality, and achieve seamless connection of each stage.
(four) development plan
At present, our country is implementing the construction of Beidou satellitenavigation system. According to the overall planning, system construction about 2012, system will first have to cover the Asia Pacific region positioning,navigation and timing as well as the short message communication service capabilities; around 2020, built the Beidou satellite navigation system covering the whole world.
(five) service
Beidou satellite navigation system is dedicated to provide users with high qualityglobal positioning, navigation and timing services, including open service and authorization service in two ways. The open service is provided free of charge toglobal positioning, velocity and timing services, positioning accuracy of 10 meters, the measurement precision of 0.2 M / s, timing accuracy of 10 ns.Authorization service is to have high accuracy, high reliability of satellite navigation users, location, speed, timing and communication service and system integrity information.
In order to make the Beidou satellite navigation system is better for global services, strengthen the compatibility between Beidou satellite navigation system and other satellite navigation system and interoperability, promote thecomprehensive application of satellite positioning, navigation, time service, Chinais willing to cooperate with other countries, the common development of satellitenavigation industry.