首先利用希尔波特变换解调出信号包络，进而计算出解调谱；
By means of Hilbert transform, the author obtains the signal envelope, and then calculates the demodulation spectrum.
为了体现这一特点，本文将HHT进一步称为希尔·波特-黄变换局瞬信号分析(HHT - LISA)。
For showing this characteristic, this paper further calls the HHT as the Hilbert-Huang transform Local-instantaneous signal analysis (HHT-LISA).
本文提出采用希尔波特-黄变换（HHT）方法从干扰和噪声中提取微弱的冲击无线电信号。
The Hilbert-Huang Transform(HHT) methods is used to extract the weak impulse radio signal from interferential and noisy environment in this paper.
本文提出采用希尔波特-黄变换（HHT）方法从干扰和噪声中提取微弱的冲击无线电信号。
The Hilbert-Huang Transform(HHT) methods is used to extract the weak impulse radio signal from interferential and noisy environment in this paper.
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