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GEO-FOG 3D and 3D Dual: Learn More

Inertial Solutions in Autonomous Ground Reference Systems

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Robust, precise INS and AHRS with embedded GPS
The KVH GEO-FOG 3D commercial off-the-shelf inertial navigation system (INS) has KVH’s highly accurate Fiber Optic Gyro (FOG)-based 1750 inertial measurement unit (IMU) as its core processor. With a data rate 10x faster than competing systems, the advanced GEO-FOG 3D includes 3 KVH DSP-1750 gyros, the world’s smallest high performance FOG, integrated with 3 low noise MEMS accelerometers, 3 axes of magnetometers, a pressure sensor, and an option of a single or dual antenna GNSS receiver. Advanced sensor fusion makes this INS capable of delivering precise, dependable navigation and control to a wide variety of unmanned, autonomous, and manned aerial, ground, marine and subsurface applications and platforms.

Accurate positioning and navigation when GPS is blocked, jammed or unavailable
The highly accurate GEO-FOG 3D INS filter utilizes a unique sensor fusion algorithm more intelligent than the typical Kalman filter used in many inertial solutions. Therefore the GEO-FOG 3D INS can extract considerably more data from the IMU core processor. Designed for challenging navigation and control applications, the embedded GNSS receiver supports all the current and future satellite navigation systems including GPS, GLONASS, GALILEO and BeiDou.

The commercial GEO-FOG 3D also features a north-seeking algorithm which provides accurate heading as fast as 10 seconds after power-on from a hot start, and 10 minutes from a cold start. The GEO-FOG 3D north-seeking algorithm runs continuously while the INS is operating, unaffected by velocity or angular motion. This enables the GEO-FOG 3D and GEO-FOG 3D Dual to provide precise heading in environments in which magnetometers and GNSS-heading cannot be used.

Ideal for critical applications
The ruggedized GEO-FOG 3D INS is suited for the most demanding applications. Its built-in performance monitoring and instability protections ensure stable and reliable data. The embedded Trimble GNSS receiver includes Receiver Autonomous Integrity Monitoring (RAIM) to assess the integrity of satellite signals. In the unlikely event of a primary IMU failure, the GEO-FOG 3D INS has a built-in backup MEMS IMU providing seamless inertial data collection.

The GEO-FOG 3D single antenna INS and the GEO-FOG 3D Dual antenna INS provide ideal solutions for robotics navigation and control systems, and navigation for manned, unmanned and autonomous systems. These INS also offer the best solution for positioning and imaging, georeferencing, land surveying, 3D mobile mapping, and stabilization and orientation.

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Brochures & Datasheets

Document File Info
DATASHEET - GEO-FOG 3D INS PDF file 560 KB / 2 pg
DATASHEET - GEO-FOG 3D INS 光ファイバージャイロ - (Japanese) PDF file 681 KB / 2 pg



Strong magnetic fields have the ability to cause apparent drift in the gyro bias. This is due to the Faraday effect on the laser light in the sensing coil resulting in non-reciprocal light paths. While this effect can be observed in gyros designed for precision inertial navigation systems (drift rates of less than 1 degree per hour), and can be mitigated by the use of mu-metal shielding, there have been no reported problems with KVH FOGs. If your application results in mounting a FOG near a very strong magnetic field (>50 gauss), a practical test to determine sensitivity is suggested.


  • Commercial off-the-shelf product (COTS)
  • Six degrees of freedom (DoF) IMU with integrated high-performance FOGs & accelerometers
  • Innovative sensor fusion algorithm extracts more information than typical Kalman filters
  • Data rate 10x faster than competing systems
  • North-seeking gyrocompass
  • Altitude and Heading Reference System (AHRS)
  • Embedded Trimble GNSS receiver
  • Available with single or dual antennas
  • Contains triple or dual frequency GNSS receiver (depending on single or dual antenna variant)
  • Provides up to 8 mm positioning accuracy
  • Fully supports GPS, GLONASS, GALILEO & BieDou
  • Developer Kits available

This product is covered by one or more patents.


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