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

A technology of fiber optic gyroscope and optimization method, which is applied in the direction of Sagnac effect gyroscope, etc., and can solve problems that need to be optimized

Active Publication Date: 2021-07-06
安徽华驰动能科技有限公司
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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 prec...

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

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Embodiment Construction

[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] According to an embodiment of the present invention, a noise spectrum analysis and signal-to-noise ratio optimization method of a fiber optic gyroscope specifically includes the following steps:

[0069] The first step is to use sine wave modulation technology to demodulate to obtain the closed-loop error of the closed-loop fiber optic gyroscope system; specifically includes:

[0070] The sinusoidal modulation is designed to suppress the 1 / f...

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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...

Claims

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Application Information

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IPC IPC(8): G01C19/72
CPCG01C19/72
Inventor 王志强韩坤
Owner 安徽华驰动能科技有限公司
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