Long March 3B/YZ-1 | Beidou-3 M21 & M22

These two satellites will be used to provide global navigation coverage as part of the Chinese Beidou (Compass) satellite navigation system.

The Long March 3B is a Chinese orbital carrier rocket. Introduced in 1996, it is launched from Launch Area 2 and 3 at the Xichang Satellite Launch Center in Sichuan. A three-stage rocket with four strap-on liquid rocket boosters, it is currently the most powerful member of the Long March rocket family and the heaviest of the Long March 3 rocket family, and is mainly used to place communications satellites into geosynchronous orbits.

The China Aerospace Science and Technology Corporation (CASC) is the main contractor for the Chinese space program. It is state-owned and has a number of subordinate entities which design, develop and manufacture a range of spacecraft, launch vehicles, strategic and tactical missile systems, and ground equipment. It was officially established in July 1999 as part of a Chinese government reform drive, having previously been one part of the former China Aerospace Corporation. Various incarnations of the program date back to 1956.

• BeiDou

  Navigation Constellation
  The BeiDou Navigation Satellite System is a satellite-based radio navigation system owned and operated by the China National Space Administration.[4] It is one of the global navigation satellite systems that provide 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.
  Program infoProgram wiki