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光纤陀螺方波调制信号引起的调制串扰会导致陀螺输出信号的不稳定,恶化阈值、标度非线性等指标。过调制技术是采用增大调制相位来抑制噪声的一种方法,根据过调制串扰的相关解调原理和模型,推导出含过调制串扰的陀螺输出表达式,指出过调制相位是影响串扰量的重要因素。针对增大过调制相位引起串扰量增加的问题,提出一种抑制过调制串扰的多态方波调制方法,利用响应余弦函数的周期性和调制波形的重复性,产生统计上相关性很小的调制信号和解调信号,在一定的延迟时间下,调制信号及串扰信号与解调信号的相关结果为0,在相关解调过程中减小串扰量。仿真和实验结果表明,该调制方法对串扰信号的抑制作用相比方波过调制提高一个数量级,陀螺的零偏稳定性和阈值指标相比方波过调制改善约40%。
Modulation crosstalk caused by FOG square-wave modulation signals can cause instability of the gyro output signal, deterioration threshold, and scale non-linearity. Overmodulation technology is a method of increasing the modulation phase to suppress noise. According to the correlation demodulation principle and model of overmodulation crosstalk, the gyroscopic output expression with overmodulation crosstalk is deduced. It is pointed out that the overmodulation phase affects the amount of crosstalk Key factor. Aiming at the problem of increasing the crosstalk caused by increasing the modulation phase, a multi-state square-wave modulation method to suppress overmodulation crosstalk is proposed. By using the periodicity of the response cosine function and the repeatability of the modulation waveform, a statistically significant correlation Modulation signal and demodulation signal, in a certain delay time, the modulation signal and crosstalk signal and the demodulation signal correlation result is 0, in the relevant demodulation process to reduce the amount of crosstalk. Simulation and experimental results show that this modulation method can reduce the crosstalk signal by one order of magnitude compared with square wave overmodulation, and the gyro bias stability and threshold index improve about 40% compared with square wave modulation.