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Polymorphic modulation method for eliminating crosstalk of digital closed-loop fiber-optic gyroscope

A fiber optic gyroscope and digital closed-loop technology, applied in Sagnac effect gyroscopes and other directions, can solve the problems of inability to achieve de-correlation between modulated signals and demodulated signals, and lack of generality, so as to reduce the impact and improve performance. Effect

Inactive Publication Date: 2021-08-27
XIAN SINO HUAXIN MEASUREMENT & CONTROL
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Problems solved by technology

[0006] But the six-state modulation can only target a single modulation depth of Can achieve the effect of eliminating crosstalk, but in the best modulation depth With any other modulation depth, it is impossible to realize the decorrelation of the modulated signal and the demodulated signal, which is not general

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  • Polymorphic modulation method for eliminating crosstalk of digital closed-loop fiber-optic gyroscope
  • Polymorphic modulation method for eliminating crosstalk of digital closed-loop fiber-optic gyroscope
  • Polymorphic modulation method for eliminating crosstalk of digital closed-loop fiber-optic gyroscope

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Embodiment Construction

[0035] Below in conjunction with embodiment the implementation process of the present invention is described in further detail:

[0036] Crosstalk is the key error of the closed-loop fiber optic gyroscope. The first crosstalk signal is generated by coupling the hardware circuit to the output of the photodetector, and the other is generated by the modulation signal. It is difficult to block the crosstalk channel from the hardware aspect, so the most effective way to reduce the crosstalk is to make the correlation result between the modulated signal and the demodulated signal of the photodetector zero. For high-performance interferometric closed-loop fiber optic gyroscopes, Not the best modulation depth. In order to improve the signal-to-noise ratio of the photodetector, the modulation phase with a larger modulation depth is usually selected to suppress the noise of the optical signal, which is the most basic noise source of the interferometric fiber optic gyroscope. However,...

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Abstract

The invention discloses a polymorphic modulation method for eliminating the crosstalk of a digital closed-loop fiber-optic gyroscope, which comprises the following steps of: constructing a general expression of a polymorphic modulation sequence by using a mathematical model, finding a relationship between the modulation sequence and a demodulation sequence, enabling a cross correlation coefficient between the modulation sequence and the demodulation sequence to be zero so as to obtain an optimal modulation scheme under any modulation depth, and when the modulation depth is 7 / 8 pi, obtaining a 32-state modulation scheme so that the correlation can be zero. The precision of the fiber-optic gyroscope can be improved, the working stability of the fiber-optic gyroscope is ensured, and the fiber-optic gyroscope has great engineering application value.

Description

technical field [0001] The invention belongs to the field of fiber optic gyroscopes, and in particular relates to a multi-state modulation method for eliminating crosstalk of digital closed-loop fiber optic gyroscopes. Background technique [0002] Fiber optic gyro is an angular rate sensor based on the Sagnac effect. It has the advantages of small size, light weight, all solid state, and low cost. It is mainly used in the fields of aviation, aerospace, and navigation. The research of fiber optic gyro has attracted much attention. At present, the digital closed-loop fiber optic gyroscope adopts square wave modulation and secondary closed-loop feedback control technology. Due to the strong coupling between the square wave modulation signal and the output signal of the detector, crosstalk will occur, which is the main factor affecting the dead zone of the gyroscope. Factors, which in turn affect important indicators such as the bias stability of the fiber optic gyroscope and t...

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Application Information

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IPC IPC(8): G01C19/72
CPCG01C19/72
Inventor 石念宝徐金涛刘尚波杨一凤曹辉
Owner XIAN SINO HUAXIN MEASUREMENT & CONTROL
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