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首页> 外文期刊>Optical fiber technology >Effect of digital-to-analog converter glitch on the modulation and demodulation of a digital closed-loop fiber-optic gyroscope
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Effect of digital-to-analog converter glitch on the modulation and demodulation of a digital closed-loop fiber-optic gyroscope

机译：数模转换器故障对数字闭环光纤陀螺仪的调制和解调的影响

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摘要

Dead zone or bias error, which is induced by a glitch in the digital-to-analog converter (DAC) in a fiber-optic gyroscope (FOG) is proposed. The DAC glitch produces different forms of jamming signals and ultimately results in demodulation errors which depend on the modulation frequency and pass through zero at the proper frequency. The demodulation error is modelled as a piecewise function according to its characteristic, i.e., it appears to be a constant value when the staircase ramp ranges from 2(n-2) to 2(n-1) and remains zero when the staircase ramp outs of this range, where it is the bit length of the register. Simulations reveal that the staircase ramp oscillates, which leads to the dead zone when the equivalent angular velocity induced by the demodulation error is greater than the input angular velocity; otherwise, the staircase ramp resets with different slopes, which results in a bias error. We test the DAC glitch effect in a closed-loop FOG. The test results reveal that the dead zone induced by the demodulation error is consistent with that of the simulation results.
机译：提出了死区或偏置误差，该误差是由光纤陀螺仪（FOG）中的数模转换器（DAC）中的毛刺引起的。 DAC毛刺会产生不同形式的干扰信号，并最终导致解调误差，该误差取决于调制频率并以适当的频率通过零。解调误差根据其特性建模为分段函数，即，当楼梯坡度从2（n-2）到2（n-1）时，它看起来是一个恒定值，而当楼梯坡度超出时，它保持为零。在此范围内，它是寄存器的位长。仿真结果表明，当由解调误差引起的等效角速度大于输入角速度时，阶梯坡会发生振荡，从而导致死区。否则，楼梯坡道将以不同的斜率复位，从而导致偏置误差。我们在闭环FOG中测试DAC毛刺效应。测试结果表明，解调误差引起的盲区与仿真结果一致。

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