他认为，人类运用雷达天文学探测小行星和金星等天体，早已经发射出可以被外星智慧生物接收到的信号。
He argues that radar astronomy, which is used to probe things like asteroids and the surface of Venus, already gives off signals that could be picked up by aliens.
NASA的雷达天文学家周五发现了它的轨迹，并立即将它的位置精确至一公里以内的区域，比此前最好的估计精确了50倍。
NASA radar astronomers picked up its track on Friday and were immediately able to narrow its position to within one kilometer — 50 times better than their previous best estimate.
该技术在射电天文学、卫星雷达和机载雷达上均获得了巨大成功。
The technique has been highly successful in radio astronomy, and in both satellite and aircraft borne radar.
低噪放广泛地应用于宇宙通讯、雷达、电子对抗、遥测遥控、射电天文、大地测绘、微波通信等无线电通信系统中。
The Low Noise Amplifier is widely used in Universe Communication, Radars, Electronic Countermeasures, Telemetry and Remote Mapping, Radio Astronomy, Geodetic, Microwave Communications, etc.
空间谱估计是阵列信号处理的一个重要分支，近年来在雷达、通信、声纳、地震、射线天文等科技领域取得了极为广泛的应用。
Spatial spectrum estimation is an important area in array signal processing, which is widely used in radar, communication, sonar, earthquake, chronometer and other aspects of science and technology.
这一门课程是探讨在通信、天文、遥测（遥感）、仪器与雷达上的射频信号与光信号的检测与度量。
This course explores the detection and measurement of radio and optical signals encountered in communications, astronomy, remote sensing, instrumentation, and radar.
本文重点讨论了多普勒效应的原理以及它在天文学、雷达、交通、医疗等方面的应用。
This article put a stress on the principle of Doppler effect and its application to astronomy, radar, transportation, medical treatment, etc.
本文重点讨论了多普勒效应的原理以及它在天文学、雷达、交通、医疗等方面的应用。
This article put a stress on the principle of Doppler effect and its application to astronomy, radar, transportation, medical treatment, etc.
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