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Inertial Solutions in Autonomous Ground Reference Systems

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High accuracy, high-performance INS and AHRS with embedded GNSS
KVH’s benchmark high-performance Fiber Optic Gyro (FOG)-based 1750 inertial measurement unit (IMU) is the core processor of the robust GEO-FOG 3D Dual inertial navigation system (INS). The precision commercial off-the-shelf GEO-FOG 3D Dual features two GNSS antennas on a fixed RTK baseline to offer increased heading, pitch, and roll accuracy for static and dynamic applications where a single antenna system can be problematic. This dual antenna INS is the best choice for systems requiring heading at start-up or in low dynamic conditions. The GEO-FOG 3D Dual has a data rate ten times faster than other available systems and is also an attitude and heading reference system (AHRS).

The GEO-FOG 3D Dual is built upon KVH’s 1750 IMU which consists of:

  • Three KVH DSP-1750 FOGs -- the world's smallest high-performance FOG
  • Three low-noise MEMS accelerometers
  • Three axis of magnetometers
  • Pressure sensor
  • Dual antenna
  • Dual frequency GNSS receiver

GEO-FOG 3D Dual’s advanced sensor fusion provides dependable, precise navigation and control to a full array of unmanned, autonomous, and manned aerial, ground, marine and subsurface applications and platforms.

Provides accurate navigation and positioning, with or without GNSS
The use of a cutting-edge sensor fusion algorithm means the GEO-FOG 3D Dual INS filter is smarter than the typical Kalman filter offered in other inertial systems. This algorithm automatically switches from loosely- to tightly-coupled filtering for improved performance under poor GNSS signal conditions. The embedded GNSS receiver is perfect for challenging navigation and control applications, and supports all global satellite navigation systems including GPS, GLONASS, GALILEO and BeiDou.

The INS also features high-speed update rates and a rapid north-seeking algorithm that provides accurate heading as fast as 10 seconds after power-on from a hot start, and 10 minutes from a cold start. This north-seeking algorithm continuously runs while the INS is operating, and is unaffected by velocity or angular motion. Providing GNSS positioning backed with precise inertial data, the GEO-FOG 3D Dual delivers high accuracy heading in environments in which magnetometers and GNSS-based heading cannot be used.

Critical applications demand more intelligent sensors
The rugged GEO-FOG 3D Dual is ideal for the most challenging applications, with performance monitoring and instability protections built in to deliver stable and reliable data. The INS has an embedded Trimble GNSS receiver with Receiver Autonomous Integrity Monitoring (RAIM) to assess the integrity of satellite signals.

The GEO-FOG 3D Dual offers a powerful and capable navigation and control solution for the most demanding manned, unmanned and autonomous systems. This advanced fiber optic gyro technology-based INS also delivers an ideal 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 Dual INS PDF file 582 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.


  • KVH 1750 IMU as core processor
  • Six degrees of freedom (DoF) IMU with integrated gyros and accelerometers
  • Innovative sensor fusion algorithm extracts more data than typical Kalman filters
  • Data rate ten times faster than other available systems
  • North-seeking gyrocompass
  • Attitude and Heading Reference System (AHRS)
  • Embedded Trimble GNSS receiver
  • Contains dual frequency GNSS receiver
  • Provides up to 8 mm positioning accuracy
  • Fully supports GPS, GLONASS, GALILEO & BeiDou
  • Developer Kit available

This product is covered by one or more patents.


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