As a powerful analysis tool of non-stationary signal, time-frequency domain analysis can depict the energy density or/and intensity in time and frequency domain simultaneously, so it is very useful in the analysis of FHSS signal.
作为一种分析非平稳信号的有力工具，时频分析技术能同时描述信号在时间及频率域的能量密度或强度，因而在分析跳频信号时极其有用。
参考来源 - 跳频通信信号参数估计及干扰技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
From the basic conception of wavelet transformation, we discuss briefly the zooming characteristics of wavelet transformation in time-frequency domain analysis in this paper.
从小波变换的基本概念出发，简要介绍了小波变换在信号时-频分析中的变焦特性。
Then the time domain analysis methods and frequency domain analysis methods which are frequently used for fault diagnosis have been discussed.
其次论述了常用的故障诊断方法，即时域分析方法和频域分析方法。
The main analytical method of unsteady flow in pipelines includes frequency domain analysis and time domain analysis.
管道中非稳定流动的分析方法主要有频域法和时域法。
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