SIGINT(Signal Intelligence) satellite is used to detect, intercept a nd locate electromagnetic(EM) signals radiated by systems such as ground radar, communication and TT&C systems.

信号情报侦察卫星用于侦收地面雷达、通信和测控等系统所辐射的电磁信号并对其 定位，是航天侦察的重要手段。

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The bright colors on the blue background indicate that an anomalous signal was received here on Earth by a radio telescope involved in a Search for Extraterrestrial Intelligence (SETI).

在蓝色背景上的明亮颜色表明在地球上收到了一个不寻常的信号，它来自于搜寻地外文明计划（SETI）的一台射电望远镜。

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Perfecting a robot that bridges the gap will call for advances in almost every facet of modern robotics: artificial intelligence, machine vision, mechanical and electrical design, signal processing.

完善一台填补空白的机器人几乎要求现代机器人每一方面的先进技术：人工智能、机器视觉、机械和电气设计、信号处理。

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As he describes the Clinton team's evolution from relative impotence in Bosnia during its early months to dynamic involvement in 1995, Mr Halberstam gives a sympathetic hearing to the foreign-service officers who protested strongly because America seemed to be condoning Serb atrocities, about which the United States, with its signal and satellite intelligence, was uniquely well informed.

ECONOMIST: Washington chronicle

Staff tell an apocryphal-sounding anecdote from the Search for Extraterrestrial Intelligence, when a promising signal turned out be a technician warming his lunch at the Arecibo Observatory in Puerto Rico.

BBC: Aye to the telescope

Amos Yadlin, a former head of Israel's military intelligence, said the strike is a signal to Syria's ally, Tehran, that Israel is serious about the red lines it has set.

NPR: Israeli Warplanes Strike Syria In Escalation