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Method and device for suppressing light source intensity noise of fiber optic gyroscope

A technology of fiber optic gyroscope and light source intensity, which is applied in the direction of Sagnac effect gyroscope, etc., can solve the problems of increasing the interference signal noise of fiber optic gyroscope and failing to suppress noise, so as to improve reliability and practicability, and reduce angular randomness. Walking, the effect of improving the accuracy of the gyroscope

Active Publication Date: 2011-09-07
哈尔滨哈船导航技术有限公司
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Problems solved by technology

However, when the correlation between the fiber optic gyroscope interference signal sequence and the intensity noise estimation sequence at the idle end of the coupler is poor, the subtraction method will increase the fiber optic gyroscope interference signal noise instead, and cannot achieve the effect of suppressing noise

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  • Method and device for suppressing light source intensity noise of fiber optic gyroscope
  • Method and device for suppressing light source intensity noise of fiber optic gyroscope
  • Method and device for suppressing light source intensity noise of fiber optic gyroscope

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Embodiment

[0055] Beneficial effect of the present invention is described as follows by two tests below:

[0056] (1) Adjust the correlation between the polarizer 5 output signal and the gyro interference signal to be m=0.28, such as image 3 As shown, when the subtraction method is used to reduce the noise, the ratio of the variance of the signal to the interference signal is It shows that the noise variance of light source intensity rises to 143.18% of the previous one. The theoretically calculated noise variance value is 2(1-m)=1.44, which is consistent with the experimental results. The test shows that when the cross-correlation coefficient is small, the noise increases after denoising, and the noise suppression effect cannot be achieved. At this time, an alarm will be output, prompting that the optical fiber gyro optical path or circuit should be checked and adjusted.

[0057] (2) Adjust the correlation between the polarizer output signal and the gyro interference signal...

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Abstract

The invention discloses a method and a device for suppressing light source intensity noise of a fiber optic gyroscope. The method comprises the following steps of: estimating an intensity noise suppressing effect by utilizing a signal correlation coefficient; judging whether to perform intensity noise suppression according to an estimation result; when the estimation result meets the requirement, programming an interference signal and an intensity noise estimation signal in a field programmable gate array (FPGA) chip to finish signal subtraction, so that an intensity noise component in the interference signal is suppressed; otherwise, prompting to improve an optical path or a circuit of the fiber optic gyroscope and when the estimated intensity noise suppressing effect meets the requirement, performing the noise subtraction. The method can be performed in real time in an actual working environment of the fiber optic gyroscope, so the reliability and the effectiveness of suppressing the intensity noise of the fiber optic gyroscope are improved, the situation that the noise of the fiber optic gyroscope rises rather than fall in the intensity noise suppression by a subtraction method is prevented, a random walk coefficient is reduced, and the gyroscope precision is improved.

Description

technical field [0001] The invention relates to a method and a device for suppressing the intensity noise of a fiber optic gyroscope light source, and belongs to the technical field of fiber optic gyroscopes. Background technique [0002] Gyroscope is an important sensor in the field of inertial technology. It is used for sensitive carrier angular rate or angular displacement. It is widely used in inertial navigation, inertial guidance, carrier attitude measurement, etc. As a new type of angular rate sensor, the interferometric fiber optic gyroscope has the advantages of no moving parts, large dynamic range, good shock resistance and strong overload capability. In recent years, it has become a strong competitor of electromechanical gyroscopes and laser gyroscopes, and has been widely used. The light source is a very important device in the fiber optic gyroscope, and the optical signal generated by the light source is the basis for the fiber optic gyroscope to measure the ang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72
Inventor 张勇刚陈洪刚李宁高伟李涛王德双吴磊黄平王伟薛冰
Owner 哈尔滨哈船导航技术有限公司
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