Parameters analysis of triangular wave modulation in resonator micro optic gyro
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摘要: 谐振式微光学陀螺是一种新型的惯性传感仪器，与传统的机械陀螺与其他光学陀螺相比具有很多理论上的优势。通过分析抑制载波和提高信噪比，深入地研究了三角波调制频率和幅度对谐振式微光学陀螺偏置稳定性的影响。通过理论计算和仿真分析，考虑得到更好的载波抑制效果，调制幅度应选为15.44 V；考虑提高信噪比，调制频率应设为1 MHz。搭建了谐振式微光学陀螺系统，实验测试结果与理论分析吻合较好。此外，采用优化的调制参数，陀螺的偏置稳定性由0.39 ()/s提高到0.18 ()/s(10 s积分时间)。研究结果表明：选择优化的调制三角波参数可以将陀螺偏置稳定性提高一倍，对于其他调制方案，如正弦波相位调制方案，同样可以通过分析载波抑制和信噪比优化调制参数，改善陀螺偏置稳定性。Abstract: Performance of resonator micro optic gyro (RMOG) is inevitably affected by modulation parameters. The influences on the RMOG by the frequency and amplitude of the modulation triangular wave have been deeply analyzed. Theoretical analysis and Matlab simulation results show that the modulation amplitude should be set to 15.44 V to obtain better carrier suppression ratio (CSR). The outputs of photodetectors are calculated by Matlab and the modulation frequency should be set to 1 MHz to improve signal to noise ratio (SNR). Then the experimental setup is established and the related measurements are performed. The test results are in good agreement with the analytical simulation. Moreover, the bias stability of the RMOG is improved from 0.39 ()/s to 0.18 ()/s (10 s integration time) over 600 s with the optimized modulation parameters. For other modulation techniques, such as sine wave phase modulation technique, the modulation parameters can also be optimized by analyzing the CSR and SNR to improve the bias stability of the RMOG.
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