基于离散傅里叶变换的光纤陀螺电路串扰自检测

Self-Detection of Crosstalk in FOG Circuit Based on Discrete Fourier Transform

光纤陀螺由于构造限制,电路输出信号中易受驱动信号串扰,导致输出结果精度难以满足现实需求,影响了电路工作的安全性和效率。为此,提出基于离散傅里叶变换的光纤陀螺电路串扰自检测方法。首先,分析光纤陀螺电路串扰的原理,对光纤陀螺电路进行闭环检测,获取到电路信号变化规律。其次,根据得到的干扰信号函数,建立电路串扰模型,由于电路串扰间存在互容特性,针对串扰线路使用基尔霍夫电压定律,结合电流的连续性,建立串扰电路信号变化函数;根据光纤陀螺检测中的振动频率,依据电路串扰的时间序列以及电路零均值、非高斯、统计非零峰度,使用离散傅里叶变换解析串扰信号,完成电路串扰的自动检测。经实验验证:所提方法能够节省大量提取时间,平均耗时节省35 min,检测精度提高34%,能高效地完成串扰检测。

Due to the limitation of structure,the output signal of fiber optic gyroscope(FOG)is easy to be interfered by the drive signal,which results in the output precision being difficult to meet the practical requirements,affecting the safety and efficiency of the circuit.For this reason,a method based on discrete Fourier transform(DFT)for self-testing crosstalk in FOG circuits is proposed.First of all,the principle of crosstalk in FOG circuit is analyzed,and the closed-loop detection of FOG circuit is carried out to obtain the change law of circuit signal.Secondly,according to the interference signal function obtained,the circuit crosstalk model is established.Due to the mutual tolerance between circuit crosstalk,the Kirchhoff voltage law is used for the crosstalk circuit,and the signal change function of the crosstalk circuit is established in combination with the continuity of the current.According to the vibration frequency in FOG detec-tion,and according to the time series of circuit crosstalk and the circuit zero mean,non-Gaussian and statistical non-zero kurtosis,the discrete Fourier transform is used to analyze the crosstalk signal and complete the automatic detection of circuit crosstalk.The experi-mental results show that the proposed method can save a lot of extraction time,35 minutes on average,improve the detection accuracy by 34%,and efficiently complete the crosstalk detection.