【摘要】 在LabVIEW平台的基础上,研究了利用联合时频分析(JTFA)方法来分析信号的能量分布情况.此方法利用了短时傅里叶变换(STFT)的基本原理,对线性调频信号等一些非平稳信号进行分析,能很好地描述信号的频率如何随时间而变化,进而能很好把信号区分开来.这种方法比单独利用时域或频域来分析信号具有一定的优越性.更多还原

【Abstract】 Based on the LabVIEW platform,we have studied the distribution situation of the signal energy by the joint time frequency analysis method.This method has used the short-time Fourier transformation basic principle,and analyzes some non-steady signals such as the linear frequency modulation signal,and the method can describe how the signal frequency changes along with the time well,then can distinguish the signal very easily.This method has certain superiority compared to analyzing the signal by using the time domain or the frequency range alone更多还原