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Fiber Optic Gyroscope Manufacturers
Micro Magic
High-Precision MEMS, Quartz & FOG Inertial Sensing Systems for Military, Aerospace & Defense Applications
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Fiber Optic Gyroscopes
Overview of Fiber Optic Gyroscopes for Tactical Navigation & Stabilization
Introduction to Fiber Optic Gyroscopes
Fiber Optic Gyroscopes (FOGs) are precision inertial sensors that measure angular velocity using the interference of light traveling through optical fiber. Operating on the Sagnac effect, these solid-state gyroscopes detect rotation without conventional spinning mechanical components, providing stable angular rate measurements for military navigation, guidance, and stabilization systems.
Available in tactical, navigation, and strategic-grade configurations, fiber optic gyros are used in military aircraft, Unmanned Aerial Vehicles (UAVs), armored vehicles, naval platforms, and precision-guided weapons. They are also integrated into Inertial Measurement Units (IMUs) and Inertial Navigation Systems (INS), where their measurements support attitude determination, heading estimation, and navigation during GNSS outages.
Types of Fiber Optic Gyroscope
Fiber optic gyroscopes are available in several architectures and configurations, differing in optical design, signal processing, measurement accuracy, and integration requirements. They may also be classified by performance grade, reflecting their suitability for different navigation and stabilization applications.
| FOG Type | Operating Principle & Performance Characteristics |
| Open-Loop Fiber Optic Gyroscopes | Measure the Sagnac phase shift without actively nulling it through closed-loop feedback. These designs typically offer simpler control electronics, although their linearity, dynamic range, and scale factor stability may be more limited than those of closed-loop configurations. |
| Closed-Loop Fiber Optic Gyroscopes | Use feedback modulation to compensate for the measured phase shift, improving linearity, dynamic range, and scale factor performance. These configurations are commonly used in high-accuracy military navigation systems requiring stable angular rate measurements. |
| Interferometric Fiber Optic Gyroscopes (IFOGs) | Measure rotation through interference between counter-propagating light waves in an optical fiber coil. This established FOG architecture can employ open-loop or closed-loop signal processing, with performance influenced by coil design, optical components, and electronic processing. |
| Resonant Fiber Optic Gyroscopes (RFOGs) | Use an optical fiber resonator to detect rotation-induced frequency differences between counter-propagating light waves. Resonant designs offer the potential to reduce the required fiber length, although performance depends on controlling optical noise, backscattering, and environmental sensitivity. |
| Single-Axis Fiber Optic Gyroscopes | Measure angular velocity around one sensing axis, supporting individual stabilization channels, angular rate monitoring, and integration into multi-sensor assemblies. |
| Three-Axis Fiber Optic Gyroscope Assemblies | Combine three orthogonally arranged sensing axes to measure rotational motion in three dimensions. When integrated with accelerometers and navigation processing, these assemblies support inertial navigation, attitude estimation, and platform stabilization. |
Military Applications of Fiber Optic Gyroscopes
Military Aircraft and Avionics
Military aircraft use FOG-based inertial systems to support attitude estimation, navigation, and flight control. Integrated with accelerometers and other avionics sensors, fiber optic gyroscopes provide rotational measurements that help determine aircraft orientation and track changes in attitude. High-performance configurations are suitable for fighter aircraft, military transport platforms, and specialized surveillance aircraft operating under demanding flight conditions.
Tactical Navigation Systems
Tactical navigation systems incorporate FOGs to provide heading and attitude information for military operations. Fiber optic gyroscope-based inertial navigation systems combine angular rate measurements with accelerometer data to estimate platform orientation, velocity, and position from an initialized navigation state. When integrated with GNSS or other aiding sensors, these systems can limit accumulated navigation errors and support continued operation during temporary positioning signal interruptions and in contested electromagnetic environments.
Unmanned Aerial Vehicles (UAVs)
Military UAVs use compact fiber optic gyroscopes for inertial navigation, flight stabilization, and attitude control. Tactical FOG systems provide angular rate measurements for platforms requiring precise attitude and motion estimation, particularly during GNSS interference or degraded positioning conditions. Low Size, Weight, and Power (SWaP) configurations are especially relevant to unmanned aircraft with restricted payload capacity and electrical power availability.
Missiles and Precision-Guided Munitions
Missile guidance and precision-guided weapon systems use high-dynamic-range gyroscopes to measure angular motion during launch, maneuvering, and flight. FOG-based inertial systems can support continuous attitude and navigation estimation without relying on external signals, although inertial errors accumulate over time. Gyroscopes selected for these applications must meet demanding requirements for acceleration tolerance, vibration resistance, rapid startup, and measurement stability.
Land Vehicles and Armored Platforms
Armored vehicles, military trucks, and autonomous ground platforms incorporate fiber optic gyroscopes into navigation and stabilization systems. FOG-based INS units provide heading and motion estimates when GNSS signals are unavailable, while gyroscope measurements also support stabilized weapon stations, observation equipment, and sensor platforms. Ruggedized configurations are designed to withstand vehicle vibration, mechanical shock, and temperature fluctuations.
Naval Vessels and Submarines
Naval vessels and submarines use high-performance FOG systems for attitude determination, heading reference, and inertial navigation. Integrated into shipboard navigation equipment, fiber optic gyroscopes provide rotational measurements that support vessel orientation and motion estimation without requiring mechanically spinning sensing elements. Navigation-grade and higher-performance systems are particularly relevant to submarines, where satellite navigation updates may be unavailable for extended periods.
Autonomous Underwater Vehicles (AUVs)
Military Autonomous Underwater Vehicles (AUVs) use FOG-based navigation systems to estimate orientation and movement while submerged. Combined with accelerometers, Doppler Velocity Logs (DVLs), and acoustic positioning systems, FOGs support underwater navigation during missions without continuous GNSS access. DVL measurements can provide velocity aiding to reduce accumulated inertial navigation errors, making compact navigation-grade systems particularly valuable for subsea reconnaissance, mine countermeasures, and underwater survey operations.
Spacecraft and Military Satellite Systems
Military satellites and spacecraft can incorporate fiber optic gyroscopes for angular rate measurement and attitude control. FOGs provide rotational information to onboard guidance, navigation, and control systems, supporting spacecraft orientation and pointing stability alongside other attitude sensors and control equipment. Space-qualified designs require appropriate radiation tolerance, thermal stability, launch vibration resistance, and reliability for the intended mission environment.
Military Standards & Qualification Requirements
Fiber optic gyroscopes intended for defense applications may require environmental, electrical, and performance qualification according to their installation and operational requirements. Relevant standards depend on the host platform, system architecture, and procurement specifications.
- MIL-STD-810: Establishes environmental engineering considerations and laboratory test methods relevant to shock, vibration, temperature extremes, humidity, and other conditions encountered by military equipment.
- MIL-STD-461: Establishes electromagnetic interference and Electromagnetic Compatibility (EMC) requirements for military equipment and subsystems, supporting reliable operation alongside other onboard electronics.
- MIL-STD-1275: Specifies electrical power characteristics relevant to equipment connected to military ground vehicle electrical distribution systems, including applicable FOG-based navigation equipment.
- MIL-STD-704: Defines aircraft electrical power characteristics relevant to airborne FOG systems and their associated electronic interfaces.
- IEEE 952: Provides specification and testing procedures for interferometric fiber optic gyroscopes, including methods for evaluating performance characteristics such as bias, scale factor, and noise.
Applicable qualification requirements depend on the host platform, electrical architecture, procurement specification, and intended operational environment. Compliance with individual standards should be verified against the applicable test methods and specified requirements, rather than assumed from a gyroscope’s intended military use.
Developments in Fiber Optic Gyroscope Technology
Advances in photonic components, optical sensing, and digital processing are supporting improvements in FOG performance, integration, and operational flexibility for defense applications.
- Photonic Integration: Integrated optical components and increasingly compact photonic assemblies can reduce system size, simplify optical packaging, and support lower-SWaP fiber optic gyroscope designs.
- Navigation Resilience: Improvements in inertial sensor stability and integration with complementary navigation technologies can help reduce accumulated navigation errors and support continued operation during GNSS disruption.
- Advanced Digital Signal Processing: Improved algorithms enable more effective compensation for temperature-dependent bias, scale factor variation, and certain optical error sources, supporting greater measurement consistency.
- Improved Optical Fiber Technology: Developments in specialized optical fibers, fiber coil manufacturing, and winding techniques can help reduce temperature-induced errors and improve long-term measurement stability.
These developments are particularly relevant to military platforms requiring compact, reliable inertial sensing with reduced dependence on external navigation signals.
