现代战场出现的两大威胁是低空飞行的强击机和攻击型直升机.由于直升机能在雷达视距外飞行,然后突然从林带后面爬升跃起,在对方来不及发现的情况下就发射导弹,并再度下降高度,所以这种直升机可能就是目前最难及时发现和对付的目标.防空系统,尤其是雷达系统担负着探测空中来犯的敌机的任务.但由于种种原因,目前服役的雷达系统不适应较专门的探测低空目标的 Two major threats to modern battlefields are low-flying attack helicopters and attack helicopters, which, because they can fly beyond radar sight and then suddenly climb from the back of the shelter, launch missiles if the other side fails to find them and descend again Altitude, so this helicopter may be the most difficult to find and deal with the current target.air defense system, especially the radar system is responsible for detecting airborne enemy aircraft task.But for various reasons, the current service radar system is not suitable for more Dedicated to detect low-altitude targets