E-2C装备的ALR-59是一种被动辐射探测装置(passive detection system)，能在主雷达关闭的情况下依靠敌目标辐射进行探测。该系统的有效探测距离比主雷达要远两倍。
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Widely used in guidance and remote sensing, millimeter wave radiometer is a typical microwave passive detection system.
毫米波辐射计是一种典型的无源微波探测系统，在遥感和制导中获得了广泛的应用。
Because this system gives no radiation wave itself and works completely in passive mode, multi-station passive detection system has attracted more and more attention in a variety of country.
由于被动探测系统本身不发射电磁波，完全是被动工作方式，因此，近年来，多站无源探测工作方式日益受到各国的广泛重视。
A crucial issue in a passive sonar system is detection of the spectral lines.
在被动声纳系统中，线谱检测是一个至关重要的问题。
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