Fiber optic gyroscope dead band error suppression

摘要

Embodiments described herein provide for a method of modulating an input light beam of an interferometric fiber optic gyroscope (IFOG). The method includes intermittently jumping a phase step to suppress dead band. If a bit flip was clocked into a digital to analog converter generating the feedback signal at the beginning of a cycle in which the jumped phase step is implemented, the method includes at least one of re-introducing a rate difference corresponding to the bit flip, altering the timing of the bit flip, or altering the timing of the generating a feedback signal based on the jumped phase step.

主权项

1. A method of modulating an input light beam of a fiber optic coil of an interferometric fiber optic gyroscope (IFOG), the method comprising:
generating a bias modulation value for bias modulation of the input light beam; accumulating phase step corresponding to a difference in phase shift between outputs of the fiber optic coil in adjacent cycles of the IFOG to generate a phase step; generating a feedback signal for modulating the input light beam, the feedback signal corresponding to a sum of the bias modulation value and the phase step; intermittently jumping the phase step to suppress dead band, wherein jumping the phase step includes generating a feedback signal based on a jumped phase step; and if a bit flip was clocked into a digital to analog converter generating the feedback signal at the beginning of a cycle in which the jumped phase step is implemented, at least one of re-introducing a rate difference corresponding to the bit flip, altering the timing of the bit flip, or altering the timing of the generating a feedback signal based on the jumped phase step.