High-Performance Fiber Optic, Ring Laser Gyro and MEMS Inertial Sensors & Navigation Systems
CIRUS & CIRUS-EX Compact Inertial Reference Units (IRU) for Space & Defense Missions

Compact Inertial Reference Units (IRU) for Space & Defense Missions

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Ideal for military and space applications, the CIRUS (Compact Inertial Reference Unit for Space) & CIRUS-EX IRUs are designed for strategic-grade performance in a compact, cost-effective package.

The units integrate four Fiber Optic Gyro (FOG) sensors, and provide precise spacecraft attitude control, precision pointing for navigational accuracy, and platform stabilization.

The units offer tailored telemetry formats to meet specific user requirements, with the IRUs’ dual-redundant serial interfaces (MIL-STD-1553 and RS-422) supporting flexible I/O rates.

Key Features:

  • Dual Performance Grades: Achieves ARW <100 μ°/√hr for exceptional precision.
  • Redundant Configuration: Four Fiber Optic Gyro (FOG) sensors with dual A/B electronics ensure high reliability and mission success.
  • Flexible Interfaces: Dual-redundant serial interfaces (MIL-STD-1553 and RS-422) support flexible I/O rates.
  • High-Reliability Electronics: Class S and Class K rad-hard components for robust performance in harsh conditions.
  • Power Flexibility: Individual power control for each sensor.
  • Thermal Management: User-selectable thermal set points for optimal operation in varying environments.
  • On-Station Commands: Capability to execute commands for enhanced situational awareness.
  • Versatile Mounting Options: Conductive and radiative vehicle-mount configurations.
  • Customizable Telemetry: Tailored telemetry formats to meet specific user requirements.


  • Spacecraft Attitude Control: Ensures precise orientation and stability.
  • Precision Pointing and Navigation: Provides accurate guidance for defense and space missions.


Dimensions (fits within cylinder) 14.10 x 8.55 in. (max)
400.1 x 217.2 mm
14.35 x 8.75 in (max)
421.6 x 223.5 mm
Weight 34.0 lbs (15.4 kg) 37.0 lbs (16.8 kg)
Power Consumption 3 gyros operational ≤ 40 W 3 gyros operational ≤ 40 W
Bias Stability 0.0003 °/hr 0.0003 °/hr
ARW 0.000190 °/√hr
(0.000150 available)
0.000125 °/√hr
(< 0.000100 available)
Angular Rate Range > 30 °/sec > 22 °/sec