F117也不是全波段隐身。只要是小飞机,就无法做到全波段隐身。对低频电磁波,F117的反射还是很强烈的,但是对高频电磁波的反射就很小了。有不少的小伙伴应该是听过我讲的量子力学系列,都知道有个不确定性原理,粒子是速度和位置是一对矛盾。位置误差小了,速度误差就大,反之亦然。反正就是个跷跷板,按下葫芦起了瓢。雷达波对飞机的测量也是一样的原理,也存在某种矛盾性。火控雷达的波长往往都是厘米波,精确度比较高。但是偏偏F117对这个波段反射很小。米波发射倒是大,但是精确不行。而且波长和天线尺寸成正比,米波雷达必须有个尺寸庞大的天线,移动也麻烦,转动也麻烦。总之就是各种不便。根据分析,F117会在60MHz和180MHz的频段出现两个共振峰值。这两个频率对应波长是5米和1.6米。所谓的共振峰值,就是频率和飞机的某一部件的尺寸相仿,于是电磁波会产生强烈的共振。这两个波长都太大了,无法引导导弹攻击,干瞪眼没辙。所以,要对付隐身飞机,要么想办法在米波雷达上下功夫,缩小体积,采取特殊的手段想办法提高精确度。要么换用毫米波段,寻找新的共振峰值。还有一个办法就是利用分布式雷达。隐身飞机不是不反射电磁波,而是尽量把电磁波反射到了几个非常狭窄的方向,被雷达接收机收到的概率很低。如果周围不同位置放置好多个接收机,说不定能加大发现概率……
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