Patent ID: 9140551
Filing Date: 2015-09-22
Classification: G01C

Abstract:
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, wherein the phase step includes a whole value which is one or more most significant bits of the phase step and a fractional value which is the remaining least significant bits of the phase step, wherein the number of the one or more most significant bits in the whole value is the number of bits operated on by a digital to analog converter which generates the feedback signal; and intermittently jumping the phase step to suppress dead band, wherein jumping the phase step includes: