Phase domain model of a second order fiber-optic gyroscope dynamic system

In this paper, we have developed a phase-domain model to analyze a nonlinear fiber-optic gyroscope (FOG) system theoretically, and use it to obtain an optimal-designed system. System´s design including details of signal processing is described here and used to improve system´s sensitivity and precision. From computer´s simulation and experimental results, we know that 1. The experimental results coincide with the analytic results, with error less than 4% in the respects of rise time, overshooting, and steady state error; that is proved by the computer simulation for the time domain response of a step and a ramp input tests. 2. Using the phase-domain model, one can build up one´s optimal FOG system with zero steady state error, 6% overshooting, high stability, and short rise time about one of system´s natural frequency, i.e. 1/ω_n