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JDRS 1 is a Japanese data relay satellite with a dual military and civil mission.

The satellite was built by Mitsubishi Electric (MELCO), probably using their DS-2000 bus.

The military payload is an optical data relay payload to connect with the latest generation IGS-Optical and IGS-Radar reconnaissance satellites.

The civilian payload is JAXA's experimental JDRS-1 (Japanese Data Relay System) payload for use with other JAXA low earth orbit assets to replace DRTS (Kodama). While Kodama was designed to provide high-speed communications through conventional S-band and Ka-band communications, its replacement also adds optical communications systems to further increase its throughput.

JAXA's radio communication payload is DRTS, which is a direct replacement to Kodama.

JAXA’s optical communication payload is called LUCAS (Laser Utilising Communication System), which uses an infrared beam to transmit data between spacecraft at rates of up to 1.8 Gbps. It consists of two Laser terminals:

Alternate Names

  • 47202

Facts in Brief

Launch Date: 2020-11-29
Launch Vehicle: H-2A
Launch Site: Tanegashima, Japan

Funding Agency

  • Japan Aerospace Exploration Agency (Japan)


  • Communications
  • Other
  • Surveillance and Other Military

Additional Information

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

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