Pan Xiong, Liu Pengcheng, Zhang Shaobo, Jin Jing, Song Ningfang
Institute of Opto-electronics Technology, School of Instrument Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China.
Sensors (Basel). 2017 Apr 10;17(4):823. doi: 10.3390/s17040823.
A novel digital compensation scheme is demonstrated to control the gain of the modulation chain and suppress the influence of quantization error on bias. The error produced by the quantization multiplied by the scaling factor is theoretically analyzed. Simulations indicate that the quantization error varies with the input angular velocity and temperature, which is verified by experiments. By switching the integration and compression operations in the modulation chain, this quantization error is reduced, while automatic reset of the digital phase ramp register is achieved. We test the scheme in a fiber optic gyroscope. The test results reveal that the quantization-induced bias is suppressed and the residual bias is two times less than the desired accuracy with data accumulated over one-second sample interval. The scheme is a feasible method to miniaturize fiber optic gyroscope using a totally digital circuit for compensation of the modulation gain.
一种新颖的数字补偿方案被证明可用于控制调制链的增益并抑制量化误差对偏置的影响。从理论上分析了量化乘以比例因子所产生的误差。仿真表明，量化误差随输入角速度和温度而变化，这一点通过实验得到了验证。通过在调制链中切换积分和压缩操作，可减少这种量化误差，同时实现数字相位斜坡寄存器的自动复位。我们在光纤陀螺仪中测试了该方案。测试结果表明，量化引起的偏置得到了抑制，并且在一秒采样间隔内积累的数据下，残余偏置比期望精度小两倍。该方案是一种使用全数字电路补偿调制增益来实现光纤陀螺仪小型化的可行方法。
