由于雷达信号调制形式干扰方未知，降低了干扰信号和当前雷达发射脉冲信号之间的相关性。
Because the modulated form of the LFM signal in different PRI is not known to the jammer, which destroies the correlation of the jamming signal and the SAR transmitted signal in the current PRI.
尽管我们还没有检测到外星人的脉冲信号，可是技术上的进步鼓励我们去思考，如果外星人在那里发射信号，那么我们就可能很快会发现它们。
Although we have yet to detect an alien ping, improvements in technology have encouraged us to think that, if transmitting extraterrestrials are out there, we might soon find them.
通过天体观测，我们已经确认了银河系里约1800颗脉冲星，其中大部分都能发射出无线脉冲信号，信号的强弱随着这些脉冲星的旋转产生变化。
Sky surveys have identified about 1800 pulsars within the Milky Way, most of which emit pulsing radio signals that rise and fall as the pulsars spin.
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