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Polaris FOG-100
Attitude and Heading Reference System (AHRS)
The Polaris FOG-100 is a precision heading and motion sensor fulfilling the multiple roles of ship’s marine gyrocompass and six degrees of freedom (6 DOF) motion sensor for use in oceanographics, hydrography, subsea survey and metrology. 
Designed with the very newest FOG techniques, it contains three mutually orthogonal fibre optic gyroscopes, three single-axis accelerometers, laser source, phase modulator, computer and advanced proprietary algorithms. It is a highly dependable and widely versatile inertial measurement unit (IMU) ideally suited to dynamic positioning (DP) systems.
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“FOG” is the now widely used acronym for fibre optic gyrocompass, one of the most exciting technological advancements to have found its way aboard ships. The gyrocompass was invented in the late 1800s and has steered ships smartly for more than 100 years. But it is built on delicate electromechanical movements that depend on being serviced frequently. FOGs, however, devised just a few decades ago, have no moving parts and are therefore intrinsically reliable. A heading system first used just in military vessels, FOGs have now gone into large-scale production and are being fitted in more and more commercial vessels. The owners of these ships see their gyro operating expenditures drop to nothing. Along with ship’s heading, FOGs produce ship’s roll and pitch angles. And settling is a matter of just a few minutes rather than 5 hours for spinning mass gyrocompasses.
GEM Elettronica’s FOG program includes a number of different specification models and embraces inertial navigation systems too. GEM Elettronica is the proprietary owner of all of its key FOG technologies, namely the fibre winding methods, electronics and mathematical algorithms.
Contact:
edrington@gemrad.com
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