System and method for estimating noise of compass optical fiber gyroscopes for ships on line

Abstract

The invention discloses a system and a method for estimating noise of compass optical fiber gyroscopes for ships on line. The system for estimating on line comprises three optical fiber gyroscopes, three accelerometers, a signal collecting part, a DSP (Digital Signal Processor) navigation calculating part, a power supply part and an information displaying part, wherein the signal collecting part is used for collecting output signals of the gyroscopes and the accelerometers in real time, the collected output data of the gyroscopes and the accelerometers is filtered, interference influence on collection data caused by ship motion is removed and only noise interference items of the optical fiber gyroscopes are reserved, building a system equation and a measurement equation are established, parameters are estimated in real time by using an exponential weighting average algorithm and Allan coefficient of variation is effectively estimated by using nonlinear adaptive kalman filtering. The method for eliminating noise on line is capable of updating error items of an optical fiber compass and improving the course and posture output accuracy of the compass.

Description

technical field [0001] The invention relates to an on-line noise estimation system and estimation method of a marine compass fiber optic gyro under the dynamic condition of a ship. Background technique [0002] In recent years, with the gradual improvement of the accuracy and stability of the fiber optic gyroscope, the marine fiber optic compass with the fiber optic gyroscope as the core has gradually begun to be widely used on ships because of its small size, low power consumption, and low price. Applications. However, the most widely used closed-loop interferometric fiber optic gyroscope, which constitutes the core part of the ship's fiber optic compass, is composed of a kilometer-long fiber optic ring. Due to the change of temperature and humidity in the environment of the ship, as well as the influence of the surrounding magnetic field and electric field, it has a great impact on the long-term working fiber optic compass. In particular, different degrees of random nois...

AI Technical Summary

Problems solved by technology

The introduction of these random noises will have a great impact on the output value of the fiber optic gyroscope, and then affect the attitude and heading output accuracy of the fiber optic compass, so that the reliability of the system cannot be guaranteed.

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