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在基于模拟三角波相位调制技术的谐振式集成光学陀螺(IORG)调制方案中,调制三角波参数受外界环境等变化而产生波动是陀螺输出误差的主要来源之一。给出了调制三角波参数与陀螺输出的特性关系;分析了调制三角波参数波动与陀螺标度因数的变化关系;仿真计算了调制三角波参数波动与陀螺输出非线性度的关系。搭建了IORG实验系统,通过采用精密高频波形产生器产生调制三角波,得到了1h零偏稳定性为0.69(°)/s,±500(°)/s动态范围内非线性度为0.96%的陀螺输出。实验验证了理论分析计算方法的正确性以及采用模拟三角波调制方法改善集成光学陀螺检测精度的可行性。
In the resonant integrated optical gyroscope (IORG) modulation scheme based on the simulated triangular wave phase modulation technology, the fluctuation of the modulated triangular wave parameters due to changes in the external environment is one of the main sources of gyroscope output error. The relationship between the modulation triangular wave parameters and the gyro output is given. The relationship between the modulation triangular wave parameters fluctuation and the gyroscopic scale factor is analyzed. The relationship between the modulation triangular wave parameters fluctuation and the gyro output nonlinearity is simulated. The IORG experimental system was built. The modulation triangular wave was generated by using a precise high-frequency waveform generator. The 1-h bias stability was 0.69 (°) / s at 1h and the nonlinearity was 0.96% at ± 500 (°) / s Gyro output. The correctness of the theoretical analysis and calculation method and the feasibility of using the simulated triangular wave modulation method to improve the detection accuracy of the integrated optical gyroscope are verified by experiments.