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威力大的空投轻型鱼雷(直升机、反潜火箭、海上巡逻飞机)及线导重型鱼雷对潜艇是个严重威胁。越来越多的鱼雷改进了推进系统(速度高达60kn)及增加能量存贮以使续航力更长;鱼雷还装有高度复杂的对抗措施以对抗软杀伤,并使其继续攻击指定的目标;此外,鱼雷越来越静音使探测更困难,致使探测距离更短、防御反应时间缩短。在近距离布放空投轻型鱼雷大大缩短潜艇的反应时间,因而有效的潜艇鱼雷防御系统必须克服上述有限的探测及近距离作战的问题。
Powerful dropped aerial torpedoes (helicopters, anti-submarine rockets, patrol aircraft at sea) and wire-guided torpedoes pose a serious threat to submarines. More and more torpedoes improve propulsion systems (up to 60 knots) and increase energy storage for longer endurance; torpedoes are also equipped with highly sophisticated countermeasures against soft kill and allowed to continue their attacks on designated targets; in addition More torpedoes make detection more difficult, resulting in shorter detection distances and shorter defensive response times. The deployment of aerial missiles at close range greatly reduces submarine response time, so effective submarine torpedo defense systems must overcome the limited probing and close combat issues discussed above.