与此形成鲜明对比的是，最遥远的旅行者1号太空飞船在飞出100多亿公里之外，还能利用极其微弱的发射器将无线电信号传回地球。
By contrast, Voyager 1, the most distant functioning space probe, is using an extremely weak transmitter to beam radio messages back to earth across 10 billion miles of space.
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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