预警雷达
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预警雷达是一种用于远距发现空中目标或水上目标的雷达系统，它能使得防空系统或反舰系统及早作出反应，它和指引火炮导弹的火控雷达是现在最常见的两种雷达类型。
历史
最早的预警雷达系统有英国的钱恩之家，美国海军的CXAM雷达和美国陆军的SCR-270，德国的弗莱雅雷达. 它们的作用距离只有100-150英里。这是由于长波的电波传播特性很差，而当时的短波处理技术不过关不能实用化短波雷达。
The Dalles, Oregon
The Dalles, Oregon From Wikipedia, the free encyclopedia Jump to navigation Jump to search This article is about the city in Oregon. For the nearby geological formation, see Celilo Falls. For other uses, see Dalles. Not to be confused with the town of Dallas, Oregon. City in Wasco County The Dalles City The Dalles and the Columbia River in November 2008 Flag Seal Motto(s): "Cognito timor Vincit" (Latin), "Knowledge Conquers Fear" (English) Location in Oregon Coordinates: 45°36′4″N 121°10′58″W / 45.60111°N 121.18278°W / 45.60111; -121.18278 Coordinates: 45°36′4″N 121°10′58″W / 45.60111°N 121.18278°W / 45.60111; -121.18278 County Wasco County Incorporated 1857 Government • Mayor Stephen Elliott Lawrence (D) [1] [2] Area [3] • Total 6.61 sq mi (17.12...