CIRUS-A — Compact Inertial Reference Unit for Space

CIRUS-A

A strategic-grade Fiber Optic Gyro (FOG) inertial measurement unit delivering state-of-the-art performance for inertial navigation, guidance, pointing, and stabilization — across missile, space, sensor, ground, air, and marine applications, backed by more than 60 years of inertial navigation heritage.

0.0001°/hr bias stability  ·  >45°/sec angular rate range  ·  18 lb weight
0.0001°/hr
Bias Stability
0.0005°/√hr
Angle Random Walk
> 45°/sec
Angular Rate Range
18 lb
Weight
10 W
Power @ 28 VDC
CIRUS-A Fiber Optic Gyro Inertial Measurement Unit
The Hardware

One simplified optical design

CIRUS-A's high-performance FOG design simplifies the optical circuit, reducing the number of components while delivering a significant performance improvement over standard military environments. Backed by more than 60 years of inertial component and navigation system design for Space and Defense applications, CIRUS-A has been produced and delivered across many FOG-based programs requiring strategic-grade performance.

Fiber Optic Gyros Strategic-Grade Performance Simplified Optical Design
Applications

Where CIRUS-A performs

CIRUS-A's performance enhances platforms' ability to identify and defeat threats from the air and on the ground — delivering strategic-grade inertial navigation, guidance, pointing, and stabilization across domains.

Missile Guidance

Missile Guidance Systems

  • Strategic & tactical guidance
  • Inertial navigation & pointing
Platform Stabilization

EO/IR Platform Stabilization

  • Airborne sensor turrets
  • Threat identification & defeat
Pointing Applications Vehicle / Platform Navigation Northfinder Applications
Documentation

Technical specifications

01Gyro Performance+
Bias Stability (1σ)0.0001°/hr
Angle Random Walk0.0005°/√hr
Scale Factor Stability± 2 ppm
Scale Factor Linearity10 ppm
Angular Rate Range> 45°/sec
Acceleration Range± 8°/sec²
02Accelerometer Performance+
Range60 g
Bias160 µg
Scale Factor Stability300 ppm
03System Performance+
Bandwidth (Operating)> 500 Hz
Life10 yrs (1,400 hr operational/yr)
04Characteristics+
InterfaceCustom Serial Interface
05Physical+
Weight18 lb (8.165 kg)
Dimensions11.9" L × 11.1" W × 5.9" H
Power10 W @ 28 VDC
06Environmental+
Temperature (Operational)-40°C to 40°C
Temperature (Non-Operational)-40°C to 40°C
Random Vibration0.1 grms
Humidity95% @ 40°C for 6 hr
PDF
CIRUS-A 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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