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BD-3 M (Type 1)

BD-3 M [CAST]

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. Ulitmately, 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 retroreflector. As they have no apogee propulsion system, they require the launch vehicle to perform the final orbit insertion.

The third phase MEO satellites can be launched as single stellites on a CZ-3C/YZ1 with additional dispenser stage, two at a time on a CZ-3B/YZ1 with additional dispenser stage or four at a time on a CZ-5 with additional dispenser stage.

Nation: China
Type / Application: Navigation
Operator:
Contractors: CAST
Equipment: ?
Configuration:
Propulsion:
Power: 2 deployable solar arrays, batteries
Lifetime: 12 years
Mass: 1014 kg ?
Orbit: 21519 km × 21545 km, 55.26
Satellite COSPAR Date LS Launch Vehicle Remarks
BD-3 M1-S (Beidou 18) 2015-037A 25.07.2015 Xi LC-2 CZ-3B/YZ1 with BD-3 M2-S
BD-3 M2-S (Beidou 19) 2015-037B 25.07.2015 Xi LC-2 CZ-3B/YZ1 with BD-3 M1-S
BD-3 M1 (Beidou 24) 2017-069A 05.11.2017 Xi LC-3 CZ-3B/YZ1 with BD-3 M2
BD-3 M2 (Beidou 25) 2017-069B 05.11.2017 Xi LC-3 CZ-3B/YZ1 with BD-3 M1
BD-3 M3 (Beidou 26) - 2017 Xi CZ-3B/YZ1 with BD-3 M4
BD-3 M4 (Beidou 27) - 2017 Xi CZ-3B/YZ1 with BD-3 M3
BD-3 M5 (Beidou xx) - 2018 Xi CZ-3B/YZ1 with BD-3 M6
BD-3 M6 (Beidou xx) - 2018 Xi CZ-3B/YZ1 with BD-3 M5
BD-3 M7 (Beidou xx) - 2018 Xi CZ-3B/YZ1 with BD-3 M8
BD-3 M8 (Beidou xx) - 2018 Xi CZ-3B/YZ1 with BD-3 M7