Introduction
BeiDou Navigation Satellite System (BDS for short, hereinafter referred to as the BeiDou system) is built by the Chinese government and provides all-time, all-weather and high-accuracy positioning, navigation and timing services to global users. BeiDou is the name of the parts of the great bear constellation in ancient China, which is used as the identification direction in ancient times. Now it merges the latest scientific and technological achievements of mankind, and gives a new connotation to "BeiDou".

The construction of the BeiDou system was divided into three stages. At the end of 2000, the BDS-1 system was built to provide services to China. At the end of 2012, the BDS-2 system was built to provide services to the Asia-Pacific region, and around 2020, the BDS-3 system will be built to provide services to the world.

  • BDS-1 Constellation

  • BDS-2 Constellation

  • BDS-3 Constellation

Composition

The BDS is mainly comprised of three segments: space segment, ground segment and user segment.

Space Segment

The BDS space segment is a hybrid navigation constellation consisting of GEO, IGSO and MEO satellites.

The basic constellation of BDS-2 is 5GEO+5IGSO+4MEO.

BDS-3 is composed of 3GEO+3IGSO+24MEO constellation, which has communication capability between satellites and satellites, and can operate independently without ground station support.

  • BDS GEO

  • BDS MEO

Ground Segment

The BDS ground segment consists of various ground stations, including master control stations, time synchronization/uplink stations, and monitoring stations.

User Segment

The BDS user segment consists of various kinds of BDS terminals, chips, modules and antennae, as well as application systems and application services.