Abstract: In order to improve the time-frequency resolution and the capability of restraining reassigned fluctuations，a method based on the multiple window time-frequency reassignment has been proposed to analyse the signal’s time-frequency structure.This algorithm uses orthogonal Hermite functions as window functions which not only maintains a sharp location of reassignment，the low variance，high resolution of multiple window but also reduces the statistical fluctuations caused by reassignment at the same time.Simulation results demonstrate that the method is very effective for both the multicomponent signals consistted of two nearly closed Linear Frequency Modulation（LFM） signals and nonlinear frequency modulation（NLFM） signals.

Key words: Hermite function, multiple window, time-frequency reassignment, nonstationary signals

摘要： 从提高时频聚集性和抑制重排振荡的角度出发，提出了一种以正交Hermite函数作为窗函数的多窗口时频重排算法。该算法既保持了重排的高时频聚集性又具有多窗口谱分析低方差、高分辨率等优点，同时也降低了由重排引起的振荡波动。仿真实验结果表明该方法对相距很近的两线性调频信号和非线性调频信号都非常有效。

关键词: Hermite函数, 多窗口, 时频重排, 非平稳信号