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谐振式微光学陀螺(RMOG)是一种基于光学Sagnac效应的新型角速度传感器。提出了基于模拟波形连续线性相位调制技术的偏置频率调制。与传统的双频率锯齿波调制以及数字调制方法相比,偏置频率调制消除了由于锯齿波回扫或数字波形中的台阶效应引入的脉冲噪声。从理论上推导了连续线性相位调制波形参数与陀螺的动态范围和灵敏度的关系,得出波形参数的选取原则。实验采用自由谱宽、谐振清晰度分别为1.6GHz和60的集成光学谐振腔陀螺构建RMOG系统,得到1h陀螺零偏稳定性1.06×10-3rad/s、±500°/s动态范围内陀螺输出非线性度小于1%。
The resonant micro-optic gyroscope (RMOG) is a new type of angular velocity sensor based on the optical Sagnac effect. The bias frequency modulation based on continuous linear phase modulation of analog waveform is proposed. Compared with the traditional dual-frequency sawtooth modulation and digital modulation methods, offset frequency modulation eliminates the impulse noise due to the sawtooth retrace or the step effect in the digital waveform. The relationship between continuous linear phase modulation waveform parameters and gyroscope dynamic range and sensitivity is deduced theoretically, and the principle of selecting waveform parameters is obtained. In this experiment, a RMOG system was constructed by using an integrated optical resonator gyroscope with free spectral width and resonant resolution of 1.6GHz and 60 respectively. The 1 Gy gyro bias stability was 1.06 × 10-3rad / s and ± 500 ° / s gyro output Non-linearity less than 1%.