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数模转换器(DAC)是全数字闭环光纤陀螺反馈通道的重要部件,DAC的毛刺特性会对光纤陀螺的调制解调结果产生影响。基于DAC中值毛刺特性建立了光纤陀螺反馈回路的非理想调制方波模型,分析了调制频率与本征频率不同时DAC毛刺在干涉信号中产生的各类周期干扰信号。利用周期干扰信号的Fourier级数推导出了DAC毛刺造成调制解调误差的数学模型,仿真分析了数模转换器毛刺的宽度、高度,光纤陀螺调制频率、本征频率及放大电路的增益带宽对陀螺解调误差的影响。最后,通过开环实验验证了DAC毛刺对光纤陀螺调制解调的影响。
Digital-to-Analog Converters (DACs) are an important part of the all-digital closed-loop FOG feedback channel, and the glitch characteristics of the DAC affect the modulation and demodulation results of the FOG. The non-ideal square wave model of FBG feedback loop is established based on the value of median glitch in DAC, and all kinds of periodic interference signals generated by the glitch of the DAC in the interference signal are analyzed when the modulation frequency is different from the eigenfrequency. The mathematical model of DAC deburring modulation and demodulation error is deduced by using the Fourier series of periodic interference signal. The width and height of the glitch, the modulation frequency of the fiber optic gyroscope, the eigenfrequency and the gain bandwidth of the amplifying circuit Effect of gyro demodulation error. Finally, the effects of DAC glitches on the modulation and demodulation of fiber optic gyroscopes were verified by open-loop experiments.