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Early-warning radar
An early-warning radar is any radar system used primarily for the long-range detection of its targets, i.e., allowing defences to be alerted as ''early'' as possible before the intruder reaches its target, giving the air defences the maximum time in which to operate. This contrasts it with systems used primarily for tracking or gun laying, which tend to be shorter range but offer much higher accuracy.
==History==
The first early-warning radars were the British Chain Home, the US CXAM (Navy) and SCR-270 (Army), and the German Freya. By modern standards these were quite short range, typically about . This "short" distance is a side effect of radio propagation at the long wavelengths being used at the time, which were generally limited to line-of-sight. Although techniques for long-range propagation were known and widely used for shortwave radio, the ability to process the complex return signal was simply not possible at the time.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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