The BDS is also widely used to serve the country's agricultural production. An automatic driving system for agricultural vehicles has been put into large-scale application across the country, while the farming supervision platform based on the navigation system has served more than 50,000 farm machines and facilities.
China began to construct its navigation system, named after the Chinese term for the Big Dipper constellation, in the 1990s and started serving the Asia-Pacific region in 2017.
By the end of 2018, there were a total of 33 BDS satellites operating in orbit, including 15 BDS-2 satellites and 18 BDS-3 satellites.
Compared with the BDS-2 system, the technologies of the BDS-3 system have been greatly improved. The communications, data transmission, and ranging among satellites can be achieved through inter-satellite links.
The system's signals and positioning accuracy have also significantly improved. The BDS-3 satellites are equipped with high-precision rubidium and hydrogen atomic clocks independently developed by China.
The positioning accuracy of the system has reached 10 meters globally and five meters in the Asia-Pacific region. Its velocity accuracy is 0.2 meters per second, while its timing accuracy stands at 20 nanoseconds.
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