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Beidou 3M23



BD 3M (Beidou 3M) satellites are the MEO component of the 3rd phase of the Chinese Beidou (Compass) satellite navigation system, which, in contrast to GPS and GLONASS, uses both geostationary satellites and satellites in intermediate orbit.

This series provides the satellites for the intermediate constellation called "Compass-M" in 12-hours orbits. Ultimately, the MEO constellation will comprise 27 satellites.

The 3rd phase intermediate orbit satellites are based on an dedicated bus, not on the DFH-3 Bus as the earlier BD-2M satellites. They feature a phased array antenna for navigation signals and a laser retro reflector. As they have no apogee propulsion system, they require the launch vehicle to perform the final orbit insertion.

Alternate Names

  • 44542
  • Beidou3M23

Facts in Brief

Launch Date: 2019-09-22
Launch Vehicle: Long March 3B/E+YZ-1
Launch Site: Xichang, Peoples Republic of China

Funding Agency

  • Unknown (Peoples Republic of China)


  • Navigation/Global Positioning

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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