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Method and device for measuring angular speed of optical fiber gyroscope based on double-frequency modulating signals

A technology of fiber optic gyroscope and modulation signal, which is applied in the field of communication, and can solve the problems of data zero bias fluctuation and zero bias stability reduction, etc.

Inactive Publication Date: 2012-07-25
PEKING UNIV
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Problems solved by technology

[0033] However, in the existing angular velocity measurement methods, the existing Faraday magnetic field effect, drift or other low-frequency noise caused by temperature fluctuations, as well as the polarization evolution in the fiber optic gyroscope and the flicker noise of the detector will lead to fluctuations in the zero bias of the data That is, the bias stability is reduced

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  • Method and device for measuring angular speed of optical fiber gyroscope based on double-frequency modulating signals
  • Method and device for measuring angular speed of optical fiber gyroscope based on double-frequency modulating signals
  • Method and device for measuring angular speed of optical fiber gyroscope based on double-frequency modulating signals

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Embodiment Construction

[0102] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that these embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0103] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0104] image 3 A flow chart of a method for measuring the angular velocity of an interferometric fiber optic gyroscope using a dual-frequency modulation signal according to the first embodiment of the present invention is shown.

[0105] Such as image 3 As shown, when measuring the angular velocity, firstly, in step S310, apply to the phase modulator through pairs with different modulation frequencies ω 1 and ω 2 The phase modu...

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Abstract

The invention provides a method for measuring angular speed of an interference optical fiber gyroscope by utilizing double-frequency modulating signals. The method comprises the following steps of: applying a phase modulating signal obtained by carrying out linear combination on two sinusoidal signals with different modulating frequencies omega 1 and omega 2 to a phase modulator; extracting respective first harmonic components, second harmonic components and fourth harmonic components of the two modulating frequencies from output signals of the optical fiber gyroscope; substituting the light intensity amplitudes of the extracted harmonic components into a preset revised solving equation to respectively solve angular speed measurement values aiming at the two modulating frequencies; and averaging the two obtained angular speed measurement values to obtain an angular speed measurement value to be measured. By utilizing the method, the bias stability of the optical fiber gyroscope can be improved, noise of rate random walks can be reduced, and the signal to noise ratio of detection signals can be improved.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a method and device for measuring the angular velocity of a fiber optic gyroscope based on a dual-frequency modulation signal. Background technique [0002] A gyroscope is a rotational sensor used to measure the rotational angular velocity of the carrier on which it is mounted. Gyroscopes are widely used in the guidance of various aircraft and weapons, and various precision measurements in industry and military. There are three types of common gyroscopes: mechanical gyroscopes, laser gyroscopes, and fiber-optic gyroscopes (Fiber-optic gyroscope, FOG). The latter two are optical gyroscopes. Optical gyroscopes have the characteristics of compact structure and high sensitivity, but their stability is not as good as some modern mechanical gyroscopes. Due to the needs of the application, the new gyroscope should have high sensitivity and stability, low cost a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C19/72
Inventor 王子南杨易张振荣李正斌
Owner PEKING UNIV
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