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分析了 Fourier变换、短时 Fourier变换和小波变换的不同特点以及光纤陀螺信号噪声产生的原因 .根据光纤陀螺信号零点漂移的非平稳随机性和非正态分布特性 ,提出了利用小波变换所具有的时频局部化优点对其随机过程进行时频功率谱分析 ,在此基础上给出了随机过程的时 -频功率谱的分析方法 .选用具有良好紧支性的 Mexio帽小波为母小波对光纤陀螺随机噪声序列进行处理 ,仿真结果表明 ,基于小波理论的时 -频功率谱方法对光纤陀螺信号随机过程分析的有效性
This paper analyzes the different characteristics of Fourier transform, short-time Fourier transform and wavelet transform and the causes of signal noise of fiber optic gyroscope.According to the nonstationary random and non-normal distribution characteristics of zero drift of fiber optic gyroscope signal, Time-frequency localization advantages of its stochastic process for time-frequency power spectrum analysis, and on this basis gives the stochastic process time-frequency power spectrum analysis method.An optional Mexio cap with good tightness for the mother wavelet wavelet The results show that the validity of the time-frequency power spectrum method based on wavelet theory to the stochastic process analysis of fiber optic gyroscope signals