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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 2 — Jan. 27, 2014
  • pp: 1608–1618

A multi-frequency signal processing method for fiber-optic gyroscopes with square wave modulation

Yongxiao Li, Zinan Wang, Yi Yang, Chao Peng, Zhenrong Zhang, and Zhengbin Li  »View Author Affiliations

Optics Express, Vol. 22, Issue 2, pp. 1608-1618 (2014)

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The bias stability and random walk coefficients (RWC) of interferometric fiber-optic gyroscopes (IFOGs) are directly affected by characteristic noises produced by optoelectronics interactions in optic sensors. This paper documents a novel demodulation method for square wave modulated IFOGs, a method capable of suppressing the white noise that results from optical intensity noises and circuit noises as well as shot noises. In addition, this paper provides a statistical analysis of IFOG signals. Through use of orthogonal harmonic demodulation followed by deployment of matched filters to detract the Sagnac phase from the IFOGs, these channels we then processed, using principle component analysis (PCA), to establish optimal independent synchronous quadrature signal channels. Finally a difference procedure was carried out for the outputs. Our results showed that an experimental sample of the proposed IFOG (1982 m coil under uncontrolled room temperature) achieved a real-time output variance improvement in detecting the Earth’s rotation rate, which is well matched with theoretical calculations of its Cramèr-Rao bound (CRB).

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2800) Fiber optics and optical communications : Gyroscopes

ToC Category:

Original Manuscript: September 19, 2013
Revised Manuscript: January 4, 2014
Manuscript Accepted: January 6, 2014
Published: January 16, 2014

Yongxiao Li, Zinan Wang, Yi Yang, Chao Peng, Zhenrong Zhang, and Zhengbin Li, "A multi-frequency signal processing method for fiber-optic gyroscopes with square wave modulation," Opt. Express 22, 1608-1618 (2014)

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