Beidou is a global satellite navigation system independently developed and operated by China, providing positioning, navigation, and timing services to users worldwide, serving national security and economic and social development. The Beidou system consists of space segment, ground segment, and user terminals, with 58 satellites launched and covering the entire globe. The Beidou system is compatible and interoperable with other satellite navigation systems worldwide, achieving multi-system integration and improving service performance and reliability. The Beidou system is widely used in various fields such as transportation, agriculture, forestry, fisheries, public security, disaster prevention and reduction, special care, public applications, electricity, finance, etc., providing strong support for socio-economic development and improvement of people's livelihood.