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Inertial Reference Unit (IRU) Type III-C

Inertial Reference Unit (IRU) Type III-C
Registration date 3/20/2014
JAXA development group Research Unit I, Research and Development Directorate
View diagram See Attachment 1
Environmental resistance See Attachment 2
Patent number
(publication number)
Reference N/A
Satellite and launch date To be supplied after launch
Note N/A

Mitsubishi Precision Company, Limited
Kamakura-shi, Kanagawa, Japan


  • Mitsubishi precision's TDG (Tuned Dry Gyroscope) is long life and superior accurate inertial rate sensor for satellite. Enabling angular velocity of orthogonal 2 axes.
  • Compact size and light weight
  • High reliability, Long life
  • Up to severe environmental condition
  • Low power comsumption
  • 2 TDGs configuration is available (option)


High precision, Hlgh reliability and Long life Rate sensor for satellite


Item Values
Composison 3 TDGs × 2 axes (redundant) or 2 TDGs × 2 axes (available)
Linear Range
(Measurement Range)
±4.0 deg/s
Polarity Range
(Measurement Range)
±10.0 deg/s
Scale Factor 0.05 arcsec/pulse
Short Term Stability <0.006 deg/h (3σ)
Noise Equivalent Angle <1.0 arcses p-p
Disturbance Force <0.2 N @155Hz (0.05 N : option)
Disturbance Torque <0.02 Nm @155Hz (0.005 Nm : option)
-10 °C to +50 °C
0 °C to +50 °C
Power(3TDG on) <36 W nominal
Bus Voltage 30 V to 52 V
Size 208 mm × 218 mm × 176.4 mm (Typical)
Footprint 208 mm × 218 mm
Mass 6.6 kg (Typical)