Open AccessA multi-frequency signal processing method for fiber-optic gyroscopes with square wave modulation
Author(s) -
Yongxiao Li,
Zinan Wang,
Yi Yang,
Chao Peng,
Zhenrong Zhang,
Zhengbin Li
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.001608
Subject(s) - demodulation , optics , gyroscope , sagnac effect , interferometry , signal (programming language) , signal processing , physics , fibre optic gyroscope , phase modulation , modulation (music) , optical fiber , computer science , phase noise , acoustics , channel (broadcasting) , telecommunications , radar , quantum mechanics , programming language
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).