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Country/ies of origin | People's Republic of China |
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Operator(s) | China National Space Administration |
Type | Military, commercial |
Status | Operational |
Coverage | Global |
Accuracy | 3.6 m (global, public) 2.6 m (Asia Pacific, public) 10 cm (encrypted)[1] |
Constellation size | |
Nominal satellites | 30 |
Current usable satellites | 35 |
First launch | 31 October 2000 |
Last launch | 23 June 2020[2] |
Total launches | 59[3] |
Orbital characteristics | |
Regime(s) | GEO, IGSO, MEO |
Orbital period | 7⁄13 sd or 12 hours and 53 minutes |
Revisit period | 7 sidereal days |
Website | en |
Geodesy |
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The BeiDou Navigation Satellite System (BDS; Chinese: 北斗卫星导航系统; pinyin: běidǒu wèixīng dǎoháng xìtǒng) is a satellite-based radio navigation system owned and operated by the China National Space Administration.[4] It provides geolocation and time information to a BDS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more BDS satellites.[5] It does not require the user to transmit any data and operates independently of any telephonic or Internet reception, though these technologies can enhance the usefulness of the BDS positioning information.[6]
The current service, BeiDou-3 (third-generation BeiDou), provides full global coverage for timing and navigation, along with Russia's GLONASS, the European Galileo, and the US's GPS.[7] It consists of satellites in three different orbits, including 24 satellites in medium-circle orbits (covering the world), 3 satellites in inclined geosynchronous orbits (covering the Asia-Pacific region), and 3 satellites in geostationary orbits (covering China). The BeiDou-3 system was fully operational in July 2020.[8][9][10][11][12] In 2016, BeiDou-3 reached millimeter-level accuracy with post-processing.[13]
Predecessors included BeiDou-1 (first-generation BeiDou), consisting of three satellites in a regional satellite navigation system. Since 2000, the system has mainly provided navigation services within China. In December 2012, as the design life of BeiDou-1 expired, it stopped operating.[14] The BeiDou-2 (second-generation BeiDou) system was also a regional satellite navigation system containing 16 satellites, including 6 geostationary satellites, 6 inclined geosynchronous orbit satellites, and 4 medium earth orbit satellites. In November 2012, BeiDou-2 began to provide users with regional positioning services in the Asia-Pacific region.[15][16] Within the region, BeiDou is more accurate than GPS.[17]: 179
In 2015, fifteen years after the satellite system was launched, it was generating a turnover of $31.5 billion per annum for major companies such as China Aerospace Science and Industry Corporation, AutoNavi, and Norinco.[18] The industry has grown an average of over 20% in value annually to reach $64 billion in 2020.[19][20]
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