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非线性调制函数的频谱特征分析在工程中具有广泛的实用价值。本文借助 Bessel 函数详细分析了非线性调制(调幅、调频)信号的频谱特性及相位相关特性;概括了用双谱分析非线性调制信号时频谱规律,进而求出应用双谱进行信号主频及调制频率的谱识别方法。通过对步进电机转速误差的双谱分析,验证了该方法的可靠性。
The spectral characteristic analysis of nonlinear modulation function has a wide range of practical value in engineering. In this paper, Bessel function is used to analyze the spectrum characteristics and phase correlation characteristics of nonlinear modulation (AM, FM) signals in detail. In addition, the spectrum rule of bispectrum analysis of nonlinear modulated signals is summarized, and the dual frequency spectrum Frequency spectrum identification method. By the bispectrum analysis of the speed error of the stepping motor, the reliability of the method is verified.