Noise spectrum analysis and signal-to-noise ratio optimization method for fiber-optic gyroscope

Abstract

The invention discloses a noise spectrum analysis and signal-to-noise ratio optimization method for a fiber-optic gyroscope. The method comprises the following steps of: 1, demodulating by using a sine wave modulation technology to obtain a closed-loop error of a closed-loop fiber-optic gyroscope system; 2, based on the closed-loop error model, establishing a dynamic equation of the fiber-optic gyroscope by considering parameter uncertainty; and 3, designing a feedback control matrix Kc of the closed-loop fiber-optic gyroscope system, so as to enable the fiber-optic gyroscope to meet the exponential stability and to optimize the linearity and the detection precision of the fiber-optic gyroscope system under the conditions of parameter uncertainty, nonlinearity and disturbance on the premise of ensuring that the fiber-optic gyroscope has the required H infinity performance. According to the invention, the closed-loop error is modulated to high frequency so as to eliminate the influence of interference light intensity and stray light interference, the nonlinear interference effect, light intensity fluctuation and inevitable noise are considered, and a dynamic model of a closed-loop fiber-optic gyroscope system is established. Then, a robust control algorithm is designed to optimize the performance of the fiber-optic gyroscope system.

Description

technical field [0001] The invention belongs to the field of fiber optic gyroscope noise spectrum analysis and optimization, and relates to a performance optimization method of fiber optic gyroscope closed-loop control using sine wave modulation. Background technique [0002] Fiber optic gyroscopes are currently playing an important role in various fields such as inertial navigation, earthquake monitoring, and vehicle safety systems. In recent years, due to the advantages of high theoretical accuracy, small size and inherent immunity to electromagnetic interference, fiber optic gyro is considered to be one of the most promising technical directions in the field of inertial navigation. However, the light-weak signal of FOG is easily affected by various noises and uncertainties of optical parameters, which brings challenges to obtain the theoretically high-precision signal of FOG. [0003] The fiber optic gyro is an angular velocity measurement device based on the Sagnac effe...

AI Technical Summary

Problems solved by technology

However, the interference light intensity is a weak signal containing Sagnac phase, and it is necessary to extract the weak closed-loop error signal submerged by noise with high precision. Therefore, the noise level of the closed-loop fiber optic gyroscope needs to be optimized to adapt to the application of high-precision fiber optic gyroscope in engineering practice

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