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Model of Error of a FiberOptic Gyro Exposed to Thermal and Magnetic Fields

Authors: Antonova M.V., Matveev V.A.  Published: 23.05.2014
Published in issue: #3(96)/2014  
DOI:

 
Category: Navigational & Gyroscopic Systems  
Keywords: fiber-optic gyro, coefficient of impact, technique for determination of model parameters, ambient temperature, magnetic field strength, algorithmic compensation of fiber-optic gyro errors

The error of a typical gyroscopic device is characterized by the mean angular rate of deviation of the angular momentum vector in the inertial space (called a drift rate or intrinsic precession rate of a gyro). A model of error of a fiber-optic gyro is defined using the notion of "coefficient of impact on the rate of variation in the ambient temperature and the external magnetic field strength". A technique is described for finding these coefficients by experiments. A substantial influence of the rate of variation in the ambient temperature and the magnetic field strength on the gyro accuracy is established. The developed model makes it possible to build a technique of algorithmic compensation of gyro errors during the operation on the basis of data received from thermal transducers and magnetometers.

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