ERRORS MODELING OF GRAVITY METER GYROSTABILIZER WITH THE FIBER-OPTIC GYROSCOPES
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The paper deals with a mathematical model of an indicator two-axis gyro of a gravity meter sensor in the gimbals. Fiber - optic gyroscopes are used as a gyro sensor. The scheme of gyro modeling errors is given. The key advantages of fiber- optic gyroscopes, as compared with gyroscopes with a mechanical carrier of angular momentum, are highlighted. Mathematical model of the gyro is received as a combination of direct drive servo system and the scheme of indirect accelerometer correction. Correction scheme is a short-period gyro-vertical, damped by high-speed measurements using consumer equipment satellite navigation system. Time constant value of the vertical is determined by curve fitting method of local spectral density error for fiber- optic generator against a background of accelerometer errors and consumer equipment satellite navigation system. The contribution of the sensor errors of stabilization system to the overall uncertainty is defined, and the requirements for them are formulated.
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