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电子战（EW） 接收机自问世以来,在不太长的时间内经历了许多变化。从四十年代的多用途晶体视频接收机发展到大批专用的独立系统,而目前的趋势又返回到综合利用多种接收机技术的EW系统。发生这样的变化是有许多原因的。 到2000年,现代EW接收机所对付的雷达环境的信号密度将从每秒数千个脉冲增长到每秒一千万个脉冲。与脉冲密度增长的同时,威胁也不再是简单的周期性单个频率的信号,而是包括频率、位置和时间均可能有变化的信号。此外,发射机还可采用频谱扩展技术以缩小被发现的范围。
Electronic warfare (EW) receivers have undergone many changes in less than a long time since their introduction. From the multi-purpose crystal video receivers of the 1940s to a large number of dedicated standalone systems, the current trend has been returned to EW systems that make comprehensive use of various receiver technologies. There are many reasons for such a change. By 2000, the signal density of the radar environment used by modern EW receivers will increase from a few thousand pulses per second to ten million pulses per second. At the same time as the pulse density increases, the threat is no longer a signal of a simple, periodic, single frequency, but a signal of a possible change in frequency, position and time. In addition, the transmitter can also use the spectrum expansion technology to narrow the scope of the discovery.