It is crucial to study the features of the frequency hopping signals in both time and frequency domain in order to detect and trace the FH signals.
对跳频信号的时频域进行分析是研究跳频通信，实现识别、跟踪跳频信号的重要基础。
Signals of cutting force and vibration are measured with multi-sensor and features in frequency domain and time-frequency domain are extracted by using wavelet package decomposition.
利用多传感器对切削力和振动信号进行监测，通过频率变换提取切削力特征量，采用小波包分解技术提取振动信号特征量。
The features of seismic signals are different between time and frequency domains. We can make reservoir prediction better with seismic signals in frequency domain.
地震信号在频率域和时间域表现出不同的特征，利用频率域的地震信号，可以更好地进行储层预测。
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