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1999年初,科索沃空袭中F117隐型飞机在贝尔格莱德附近被击落,预警雷达起到部分作用。尽管精度不足以引导防空武器对准空中目标,但低频预警雷达还是可以瞬间扑捉到隐型飞机的信息。在冲突开始时,这种雷达是一需要攻击的目标,特别在EA-6B不在场的情况下,B-2可使用增加的弹舱,为自己提供干扰能力。新的雷达波吸收表面材料使B-2的改装变的易于进行,由此使美国空军有兴趣在远程隐形B-2轰炸机上增
In early 1999, the F117 stealth aircraft from the Kosovo air strike was shot down near Belgrade, and the early warning radar played a part. Although the accuracy is not enough to guide air defense weapons aimed at the air, but the low-frequency early warning radar can still capture the information of the hidden aircraft. The radar was the target of an attack at the outset of the conflict, and the B-2 was able to use its own extra ammunition to provide interference to itself, particularly in the absence of EA-6B. The new radar wave absorbing surface material makes the modification of the B-2 easy to perform, thus giving the U.S. Air Force an interest in increasing the long-range invisibility B-2 bomber