Frank Drake博士声称由于电视、无线电和雷达越来越少采用模拟信号进行传输，这一过程使地球在地外文明的电子设备上逐渐隐形。
Dr Frank Drake said the phasing out of analogue transmissions from television, radio and radar was making our planet electronically invisible from outer space.
介绍了一种铁路实验车的模拟接车无线传输系统，用于对红外线轴温探测设备(THDS)的静动态检测和标定。
A wireless transceiver based on simulation test train which is used to detect and calibrate the infrared axle temperature detection system (THDS) is presented in this paper.
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