Design and implementation of I-FOG with wide start dynamic range

Abstract

An ideal way to achieve high precision of I-FOG is to enhance Sagnac effect. Lengthing the fiber and enlarging the diameter of fiber coil are the major two methods. However, they bring sharp decrease on the dynamic range of I-FOG. An algorithm attempting to make the I-FOG dynamically start and work on higher interference fringe is presented and designed. The experiment platform to verify the algorithm is also established. Experiment results show that the dynamic range of I-FOG is successfully enlarged from Ω_-π ~ Ω_π to Ω_-7π ~ Ω_7π. The bias and scalar factor test show that the dynamic-range-extended I-FOG is at the same precision as the original I-FOG. The dynamic start experiment also shows a further evidence to prove the correctness and reliable of the dynamic-range-extended algorithm.