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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.


All KVH FOG products meet the European Community Electromagnetic Compatibility Directive and are approved to display the CE mark. They have been tested for conformance to electromagnetic emissions and susceptibility requirements. The units also meet FCC Part 15.

The geometrical birefringence created by the elliptical core is the key to the E-Core fiber's outstanding polarization-maintaining abilities. Because of its design, it is able to maintain its polarization and low-loss characteristics when exposed to physical stresses and temperature-induced changes far better than PM fiber created using stress-induced birefringence. It is the E-Core fiber's stability that makes it an excellent choice for pigtailing optical components.
The simplest explanation is that the IMU integrates 3 axes of fiber optic gyros with 3 axes of accelerometers in one package. All KVH fiber optic gyros combine KVH's proprietary polarization-maintaining optical fiber and fiber components with integrated digital signal processing. The result is a highly reliable system with no moving parts to wear out or require maintenance. These gyros provide extremely precise rotational rate information by measuring the phase difference between two paths of light traveling in opposite directions through an optical fiber. This rate information is then processed in a digital data stream to a variety of external systems.

KVH offers several integrated systems with IMU functionality, including the TG-6000, CNS-5000, and CG-5100.
Composed entirely of commercial components and rugged enough to operate in extremely demanding conditions, the CNS-5000 is designed to meet COTS requirements. This minimizes the operational complexities for customers whose products cross international boundaries.

Please click here for easy, online product registration. This form may be used by all customers and is automatically customized based on your selected country.

If you choose not to use the convenient online form, every KVH product also includes a printed product/warranty registration form that you may fill out and return to the address listed on the form.

Your KVH product is covered by its warranty automatically from the date of purchase. This warranty will be honored by authorized KVH technicians, installers, distributors, and dealers worldwide. Complete details regarding all KVH product warranties are available on our Warranty pages.

The CNS-5000 is designed specifically for demanding commercial applications, such as dynamic surveying, precision agriculture, container terminal management, and autonomous vehicle navigation, where the ability to determine the precise position and orientation of a piece of equipment or a mobile platform is critical.
Please see the installation and technical manual for your KVH FOG-based product for complete details of any specific power requirements.

Complete performance specifications as well as a free technical paper are available on the CNS-5000 product page.

The Integrated CommBox Modem (ICM) is the streamlined all-in-one belowdecks unit that drives the TracPhone V7-HTS. It features a browser-based user interface and a convenient iPhone® app for system status, updates, and support. Replacing a full rack of components required for competitors’ systems, the 2U-high ICM contains:
  • IP-enabled antenna control unit
  • CommBox™ Network Manager
  • High-throughput modem
  • Voice over IP (VoIP) adapter
  • Built-in Wi-Fi and Ethernet switch
  • Content storage and access for IP-MobileCast™ and Videotel™ training content
  • Support for over-the-air software updates for the ICM and antenna unit
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