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Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes
Zinan Wang1, Yi Yang, Yongxiao Li
1State Key Laboratory of Advanced Optical Communication Systems & Networks, Department of Electronics, Peking University, Beijing 100871, China. znwang@pku.edu.cn
Optics Express
|November 29, 2012
Summary
This study introduces a novel quadrature demodulation with synchronous difference technique to significantly reduce noise in interferometric fiber-optic gyroscopes (IFOGs), improving performance and stability.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Signal Processing
Background:
- Interferometric fiber-optic gyroscopes (IFOGs) are crucial for navigation and inertial sensing.
- Noise and instability limit the precision of traditional IFOGs.
- Effective demodulation techniques are essential for enhancing IFOG performance.
Purpose of the Study:
- To propose and validate a novel quadrature demodulation method with synchronous difference for noise suppression in IFOGs.
- To simultaneously obtain in-phase and quadrature results for improved signal processing.
- To reduce both short-term noise and long-term instability in IFOGs.
Main Methods:
- Implementing quadrature demodulation with synchronous difference for sine wave phase-modulated IFOGs.
- Utilizing coherent detection to obtain simultaneous in-phase and quadrature results.
- Applying eigenfrequency modulation with a 45° phase shift and a synchronous difference procedure to eliminate common noise.
Main Results:
- The novel method effectively suppresses common noise present in both in-phase and quadrature signals.
- Experimental results demonstrate a significant reduction in bias drift, from 0.040°/h to 0.004°/h.
- Both short-term noise and long-term instability of the IFOG were demonstrably reduced.
Conclusions:
- The proposed quadrature demodulation with synchronous difference is a highly effective technique for noise reduction in IFOGs.
- This method offers a substantial improvement in IFOG accuracy and stability compared to traditional demodulation.
- The technique shows great promise for enhancing the performance of fiber-optic gyroscopes in various applications.
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