Analysis and compensation for the impact of modulation signal reset errors on scale factor of interferometric fiber optic gyroscopes

Interferometric fiber optic gyroscopes (IFOGs) function as rotation rate sensors that operate based on the Sagnac effect. Currently, the digital closed-loop detection scheme is widely utilized worldwide. However, environmental disturbances can induce reset errors during the modulation signal reset. This paper examines the impact of modulation signal reset errors on the scale factor of IFOGs, and derives a quantitative relationship between reset errors and inaccuracies in the scale factor. The analysis reveals that modulation signal reset errors do not affect the asymmetry or nonlinearity of the scale factor; rather, they solely impact the reproducibility. By leveraging the relationship model between 2π-phase voltage and the temperature of the lithium niobate modulator, this paper proposes an effective compensation method to address modulation signal reset errors, thereby overcoming the limitations associated with traditional second closed-loop systems under conditions of high dynamics and low-speed input.