Experiment on bias stability measurement of resonator fiber optic gyro with digital feedback scheme
Experiment on bias stability measurement of resonator fiber optic gyro with digital feedback scheme
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DOI：
10.1117/12.835222
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发表时间：
2009-10
期刊：
影响因子：
--
通讯作者：
Xijing Wang;Zuyuan He;K. Hotate
中科院分区：
文献类型：
--
作者：
Xijing Wang;Zuyuan He;K. Hotate
用一种新的数字反馈方案对谐振式光纤陀螺的偏置稳定度进行了测量实验，其灵敏度为5.6×10-4rad/S。在数字控制方案下，由比例计算确定的快环的输出分别减少到几个最低有效位(LSB)的数量级，而慢环的输出由加/减计数器确定，从而减少激光中心频率的短期和长期漂移。采用比例积分(PI)自动控制，降低了混合式数字锯齿差调相波形中2π电压不理想引起的脉冲噪声。此外，采用两次90度偏振轴旋转拼接的谐振器激发单本征偏振态(ESOP)，抑制了偏振噪声。
Experiment on bias stability measurement of resonator fiber optic gyro with a newly developed digital feedback scheme is performed and a sensitivity of 5.6×10-4 rad/s is demonstrated. Under the digital control scheme, the short term and long term laser central frequency drift are reduced by the output of a fast loop determined by proportional calculation to the order of several least significant bits (LSBs) and the output of a slow loop decided by an up/down counter, respectively. Resettling pulse noise due to imperfect 2π voltage of the hybrid digital serrodyne phase modulation waveform is also reduced by automatic proportional and integration (PI) control. Besides, polarization noise is suppressed by exciting single eigen state of polarization (ESOP) of the resonator with twice 90 degree polarization-axis rotated splicing.