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Beidou satellite navigation system

Beidou satellite navigation system (Picture 1)


The Beidou satellite navigation system is a global satellite navigation system developed by China itself. It is the fourth mature satellite navigation system after the US Global Positioning System, the Russian GLONASS satellite navigation system, and the European Galileo satellite navigation system. The Beidou satellite navigation system consists of three parts: space segment, ground segment and user segment. It can provide high-precision, high-reliability positioning, navigation and timing services for all kinds of users all round the clock and all day in the world, and has short message communication. Capability, already has regional navigation, positioning and timing capabilities, positioning accuracy of 10 meters, speed measurement accuracy of 0.2 meters and / seconds, timing accuracy of 10 nanoseconds.

Satellite navigation systems are an important spatial information infrastructure. China attaches great importance to the construction of satellite navigation systems and has been working hard to explore and develop satellite navigation systems with independent intellectual property rights. In 2000, the Beidou navigation test system was first built, making China the third country in the world with an autonomous satellite navigation system after the United States and Russia. The system has been successfully applied in many fields such as surveying, telecommunications, water conservancy, fishery, transportation, forest fire prevention, disaster mitigation and public safety, etc., and has produced significant economic and social benefits. In order to better serve the country's construction and development and meet the global application needs, China launched the implementation of the Beidou satellite navigation system.

On December 27, 2012, the official version 1.0 of the Beidou system spatial signal interface control document was officially announced. The Beidou navigation business officially provided passive positioning, navigation and timing services to the Asia-Pacific region. On November 23, 2014, the Maritime Safety Committee of the International Maritime Organization reviewed and approved the navigation safety circular approved by the Beidou satellite navigation system, which marked that the Beidou satellite navigation system officially became an integral part of the global radio navigation system and obtained marine-oriented applications. International legal status. On November 5, 2017, the first batch of satellites of China's third-generation navigation satellite, Beidou No. 3, was successfully launched with the "one arrow and two stars" launch. It marked the official start of the construction of the Beidou global satellite navigation system.

The Beidou satellite navigation system space segment consists of five geostationary orbit satellites and 30 non-geostationary orbit satellites. China plans to cover the Asia-Pacific region around 2012 and cover the world around 2020. China is implementing the Beidou satellite navigation system and has successfully launched 16 Beidou navigation satellites. According to the overall plan for system construction, around 2012, the system will first have the ability to provide positioning, navigation and timing and short message communication services in the Asia-Pacific region. Around 2020, the Beidou satellite navigation system covering the whole world will be built. The construction, development and application of the Beidou satellite navigation system will be open to the whole world, provide high-quality free services to users all over the world, and actively carry out extensive and in-depth exchanges and cooperation with countries around the world to promote compatibility and interoperability among satellite navigation systems. Promote the development of satellite navigation technology and industry.

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