Abstract

We propose and realize a new open-loop fiber-optic gyroscope (FOG) with an all-digital signal-processing (DSP) system where an all-digital phase-locked loop is employed for digital demodulation to eliminate the variation of the source intensity and suppress the bias drift. A Sagnac phase-shift tracking method is proposed to enlarge the dynamic range, and, with its aid, a new open-loop FOG, which can achieve a large dynamic range and high sensitivity at the same time, is realized. The experimental results show that compared with the conventional open-loop FOG with the same fiber coil and optical devices, the proposed FOG reduces the bias instability from 0.259 to 0.018deg/h, and the angle random walk from 0.031 to 0.006deg/h1/2, moreover, enlarges the dynamic range to ±360deg/s, exceeding the maximum dynamic range ±63deg/s of the conventional open-loop FOG.

© 2013 Optical Society of America

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