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Compact Inertial Reference Units for Space (Cirus & Cirus - EX)

L3Harris has been the premier supplier of mission-critical precision pointing and navigation systems since the early days of the U.S. space program. Leveraging over 60 years of experience and proven performance in systems deployed in space, we have designed the CIRUS Compact Inertial Reference Unit as a next-generation product of our heritage system. The CIRUS and CIRUS-EX rate sensors deliver two different strategic grades of performance combined with the benefits of small size and low cost in one integrated chassis.

Both CIRUS and CIRUS-EX systems feature four Fiber-Optic Gyro (FOG) sensors in a fully redundant configuration for spacecraft attitude control, supporting DoD, NASA and commercial missions.


  • Two performance grades with lowest ARW < 100 μ°/√hr
  • Four gyros and dual A/B electronics provide optimal redundancy for enhanced mission success
  • Dual-redundant serial interfaces (MIL-STD-1553 and RS-422) to permit flexible I/O rates
  • High-reliability Class S and Class K rad-hard electronics
  • Each sensor individually power-selectable, providing ultimate flexibility for the end user
  • User-selectable thermal set points permit optimal operation over changing mission environments
  • User-selectable capability to execute “on-station” commands for optimal situational awareness
  • Conductive or radiative vehicle-mount options
  • Telemetry format can be customized for any specific user interface

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