Compact Inertial Reference Unit for Space

CIRUS

A next-generation strategic-grade Fiber Optic Gyro (FOG) Inertial Reference Unit for spacecraft attitude control — four fully redundant gyros, rad-hard electronics, and dual-redundant interfaces built on more than 60 years of space heritage.

0.0003°/hr bias stability  ·  < 0.000190°/√hr random walk (EOL)  ·  34 lb weight
0.0003°/hr
Bias Stability
< 0.000190°/√hr
Random Walk (EOL)
> 30°/sec
Angular Rate Range
34 lb
Weight
≤ 40 W
Power
CIRUS Compact Inertial Reference Unit for Space
The Hardware

Four gyros, one integral chassis

Built on over sixty years of space heritage, CIRUS is designed and qualified as the next generation of our heritage system. It combines strategic-grade performance with a compact, low-cost integral chassis: four Fiber Optic Gyro (FOG) sensors operating in a fully redundant configuration for spacecraft attitude control, supporting DoD, NASA, and commercial missions.

4× FOG Sensors Rad-Hard Electronics Dual-Redundant Interfaces
Key Performance Features

Built for mission success

Cost-effective, next-generation, strategic-grade Fiber Optic Gyros — engineered for flexibility, reliability, and adaptability across changing mission environments.

Precision & Redundancy

  • Two performance grades with lowest ARW <100 µ°/√hr
  • Four gyros & dual A/B electronics for optimal redundancy
  • High-reliability Class S & Class K rad-hard electronics

Flexible Interfaces

  • Dual-redundant serial interfaces (MIL-STD-1553 & RS-422)
  • Each sensor individually power-selectable
  • Telemetry format customizable for any user interface

Mission Adaptability

  • User-selectable thermal set points
  • User-selectable "on-station" command execution
  • Conductive or radiative vehicle-mount options
Applications

Where CIRUS performs

Built on more than 60 years of space heritage, the CIRUS family delivers mission-critical precision pointing and navigation for spacecraft attitude control, missile guidance, and platform navigation.

Spacecraft Attitude Control

Spacecraft Attitude Control Platform

  • DoD, NASA & commercial missions
  • Fully redundant FOG configuration
Missile Guidance

Missile Guidance Systems

  • Strategic & tactical guidance
  • Inertial navigation & pointing
Stabilization Pointing Applications Vehicle / Platform Navigation Northfinder Applications
Documentation

Technical specifications

Showing specifications for CIRUS.

01System Performance+
Bias Stability (1σ) Angle0.0003°/hr
Random Walk (EOL)0.000190°/√hr (0.000150 available)
Angle White Noise0.000025 arc-sec/√Hz (0.000006 typical)
Angular Rate Range> 30°/sec
SF Stability± 2 ppm
SF Linearity35 ppm (3 typical)
Alignment Stability (Long Term)< 3.5 arc-sec (max)
Alignment Stability (Life)< 20 arc-sec (max)
02Characteristics+
Weight34.0 lb (15.4 kg)
DimensionsØ 14.10" max × 8.55" max (fits within cylinder)
Power28 VDC input, steady-state, 3 gyros operational ≤ 40 W
Reliability (30°C)> 0.93 probability of success, 15-yr continuous life
TelemetryRS-422, MIL-STD-1553; FPGA-based, customizable
03Environmental+
Operational Temperature-23°C to +41°C, with > 14°C variations
Random Vibration9.45 grms lateral and normal
Radiation> 100 krad total dose
Radiation ToleranceSEU-tolerant, latchup immune
PDF
CIRUS Datasheet
Full performance and interface specifications
Request Datasheet
PUBLIC RELEASE. Cleared by DoD Office of Prepublication and Security Review for public release.
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