Resonance optic gyro based on digital phase oblique wave frequency shift technology

Abstract

The invention discloses a resonance optic gyro based on digital phase oblique wave frequency shift technology. The resonance optic gyro comprises an optical system composed of a tunable laser, an optical shunt, two phase demodulators, an optical resonance cavity and a photoelectric conversion module, and a processing circuit composed of two demodulation modules, two modulation signal generator modules, a frequency shift feedback control module and a feedback locking module, wherein a first signal extracted by the first demodulation module is controlled by the feedback locking module to adjust the central frequency of the tunable laser, and a second signal extracted by the second demodulation module is subjected to second frequency locking by the frequency shift feedback control module; and the output of the frequency shift feedback control module serves as the rotation output of the gyro. According to the invention, a resonance optic gyro structure is constructed, the digital phase oblique wave frequency shift technology is adopted in a second closed loop of the resonance optic gyro structure, the resonance optic gyro structure is favorable for miniaturization and integration of a system, improving the linearity and increasing the dynamic range of the system, and reducing reciprocity noise in the system.

Description

technical field [0001] The invention relates to the field of optical sensing and signal detection, in particular to a resonant optical gyroscope based on digital phase ramp frequency shift technology. Background technique [0002] Resonator Optic Gyroscope (ROG) is a new type of high-precision angular velocity sensor based on Sagnac effect. and integration have great advantages. In the resonant optical gyroscope, the rotational angular rate of the gyroscope is obtained by detecting the resonant frequency difference between the clockwise and counterclockwise optical paths of the resonant cavity. [0003] In order to improve the dynamic range of the gyroscope and the linearity of the scale factor, ROG usually needs to adopt a dual-channel closed-loop control technology. The first closed loop usually controls the center frequency of the output light of the laser through feedback, so that the center frequency of the laser is tracked and locked to the resonance frequency of the...

AI Technical Summary

Problems solved by technology

The second closed loop needs to add a frequency shifter in the second loop. The traditional acousto-optic frequency shifter used for frequency shifting is not easy to miniaturize and integrate ROG due to its large size.

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