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.
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。
The technique has been highly successful in radio astronomy, and in both satellite and aircraft borne radar.
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。
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 course explores the detection and measurement of radio and optical signals encountered in communications, astronomy, remote sensing, instrumentation, and radar.
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。
ABSTRACT :With the rapid development of satellite astronomy technique, Synthetic aperture radar (SAR) is widely applied, and more and more people pay attention to the SAR image processing.
摘要：随着航天技术的飞速发展，合成孔径雷达（SAR）的应用越来越广泛， SAR图像的分析处理也备受关注。
ABSTRACT :With the rapid development of satellite astronomy technique, Synthetic aperture radar (SAR) is widely applied, and more and more people pay attention to the SAR image processing.
摘要：随着航天技术的飞速发展，合成孔径雷达（SAR）的应用越来越广泛， SAR图像的分析处理也备受关注。
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