Wide-range optical fiber gyroscope and measuring method thereof

The invention provides a wide-range optical fiber gyroscope and a measurement method thereof, which are used for solving the technical problems that an angular rate signal is output wrongly due to the fact that feedback phase shift cannot accurately compensate input phase shift during wide range, and an existing gyroscope has data crosstalk, is difficult to acquire signals and is low in output precision. The wide-range optical fiber gyroscope provided by the invention comprises a light source, a first coupler, a master ring measurement system, a slave ring measurement system and a circuit processing module, the first coupler divides an emergent light path of the light source into a main light path and a slave light path; the main ring measurement system comprises a first photoelectric detector, a second coupler, a phase modulator and a main optical fiber ring which are arranged on a main optical path; the slave ring measurement system comprises a second photoelectric detector, a third coupler and a slave opti