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为什么要宽带覆盖无源电子战系统监视电磁频谱,测量所收到信号的参数并利用这些参数分离、识别和定出发射源的位置来保证部队作战。电子战支援措施(ESM)战术使用的目的是为了区域防御、自防御(雷达报警)和干扰机的功率管理,要求无源快速地获得数据,速度要跟得上敌方的变化。如果方位上是定向的,问题要严重一些。它要求天线的增益满足系统灵敏度的要求,即能检测远距离发射源的后瓣。信号搜索时间正比于方位和频率范围内两者窗口数目的乘积。例如;要是系统覆盖2—6千兆赫,每20兆赫一档,就有200个频率档。如果天线波束宽度是10°,则有36档来覆盖
Why Broadband Coverage Passive EW systems monitor the electromagnetic spectrum, measure the parameters of the received signals, and use these parameters to isolate, identify and locate the source of the launch to ensure that the unit is in combat. The purpose of ESM tactics is to power zone defense, self-defense (radar warning) and jammer power, requiring passive and fast data acquisition to keep pace with enemy changes. If the orientation is directional, the problem should be serious. It requires the gain of the antenna to meet the sensitivity requirements of the system, that is, to detect the backlobe of a long-range emitter. The signal search time is proportional to the product of the number of windows in both the azimuth and the frequency range. For example; if the system covers 2-6 gigahertz, there are 200 frequency bins per 20 MHz. If the antenna beam width is 10 °, there are 36 files to cover