sentences:  Once a target was located and the seeker locked the xGM-84A missile climbed rapidly to about 1800 m before diving on the target in what was known as a "pop-up maneuver".The 221 kg (488 lb) WDU-18/B penetrating blast-fragmentation warhead (in the WAU-3(V) /B warhead section) was triggered by a time-delayed impact fuze.When no target was acquired after radar activation, the Harpoon would self-destruct.