Research on Signal Processing Methods for White-Light-Driven Resonant Fiber Optic Gyroscope

In white-light-driven resonant fiber optic gyroscopes (W-RFOG), modulation and demodulation techniques are essential for signal detection. Currently, in phase modulation and synchronous demodulation, the selection of relevant modulation waveforms and parameters is mostly based on experience, lacking systematic theoretical guidance. This study systematically evaluates the impact of modulation waveforms and parameters on gyroscope performance. We compare sine and triangular waveforms, analyzing their effects on the slope of the demodulation curve and overall performance across varying modulation frequencies. Quantitative results show that sine wave modulation yields a 185% higher sensitivity coefficient near the zero-crossing point than triangular wave modulation. Furthermore, W-RFOG systems using sine wave modulation achieve a 52.6% reduction in angular random walk (ARW) and a 19.4% reduction in bias instability (BI). These findings confirm the superior effectiveness of sine wave modulation in enhancing detection sensitivity coefficient and system accuracy in W-RFOG, which holds significance for modulation waveform selection and parameter optimization in W-RFOG systems.