An Interferometric Digital Closed-loop Fiber Optic Gyroscope Active Anti-radiation Design Method

Abstract

The invention provides an active anti-radiation design method of an interference type digital closed-loop fiber-optic gyroscope. The active anti-radiation design method is used in the technical field of interference type fiber-optic gyroscopes. The active anti-radiation design method firstly provides an improved random walk coefficient prediction model, and random walk coefficients under space radiation conditions are directly calculated by substituting radiation environment parameters into the model; then margin design is conducted on the three parameters of light source power, optical fiber length and phase modulation under the radiation condition based on the random walk coefficient prediction model, and reduction of the random walk coefficients of the interference type fiber-optic gyroscope is achieved. The active anti-radiation design method is based on an original structure of the interference type fiber-optic gyroscope, and the random walk coefficients of the interference type fiber-optic gyroscope can be reduced under the condition that no additional device is added, so that the fiber-optic gyroscope used in a space meets the system requirement for the random walk performance of the gyroscope within a whole life cycle, the active anti-radiation purpose is achieved, the gyroscope has high reliability, and the overall size and power consumption of the interference type fiber-optic gyroscope are reduced.

Description

technical field [0001] The invention relates to the technical field of interferometric fiber optic gyroscopes, in particular to an active anti-radiation design method for interferometric digital closed-loop fiber optic gyroscopes based on random walk coefficient prediction models. Background technique [0002] Interferometric fiber optic gyroscope is a low power consumption, high reliability and high precision optical measuring instrument. It uses the fiber optic ring to sense the angular velocity to be measured and produces phase difference. It has no moving parts, large dynamic range, long life, impact resistance and overload resistance. And other advantages, can be widely used in aerospace field. figure 1 It is a schematic diagram of the structure of a typical interferometric fiber optic gyroscope, which mainly includes a light source, a coupler, a Y waveguide, an optical fiber ring, a detector and a signal processing device. In the space environment, the interferometric...

AI Technical Summary

Problems solved by technology

In the space environment, the interferometric fiber optic gyroscope is greatly affected by space radiation, resulting in an increase in fiber loss, a decrease in the power of the light source, and a decrease in the responsivity of the detector. bias drift

Although space calibration can compensate most of the long-term bias drift, it cannot reduce the random walk coefficient of the gyroscope, which leads to the degradation of the accuracy of the fiber optic gyroscope working in space with time, and cannot meet the long-life, high Reliability requirements, so it is necessary to carry out anti-radiation and redundant design for the gyroscope

[0003] At present, the anti-radiation design methods for interferometric digital closed-loop fiber optic gyroscopes mainly focus on passive reinforcement technologies such as doping impurity ions method and light-fading core method, but in actual engineering applications, the high cost of reinforcement technology is not conducive to mass production. , Weak anti-radiation ability is not conducive to space applications, and additional devices cause problems such as increased volume and power consumption of interferometric fiber optic gyroscopes, and reduced reliability.

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