Patent ID: 8259301
Filing Date: 2012-09-04
Classification: G01C

Abstract:
1. A method for reducing rotation sensing errors in a resonator fiber optic gyroscope (RFOG), the method comprising: propagating clockwise and counterclockwise primary light waves through a resonator having an optical fiber and a plurality of optical surfaces for directing the light wave exiting a first end of the optical fiber back into an opposite end of the optical fiber; modulating the pathlength of an optical fiber coil within the resonator based on a previously defined modulation scheme, wherein amplitude and frequency of the fiber cavity length modulation is selected to produce a relative phase modulation between the primary light waves and double-back reflected light waves, such that rotation sensing errors resulting from double backscatter is at a frequency above a frequency band of interest; generating signals at detectors based on the waves propagating in the resonator; and determining an output for the gyroscope based on the generated signals, wherein rotation sensing errors are reduced.