Abstract: A fuzing system adapted for use by a guided missile to generate a detonation signal for a warhead carried by the missile. The missile has a seeker/tracker to track, and direct the missile towards, a target. The seeker/tracker has: a seeker, gimballed with respect to the body of the missile, for producing a signal representative of the angular deviation between the target and the missile; and, a ranging system for producing a signal representative of a range between the target and the missile. The fuzing system, in response to the range signals, produces a time-to-go signal, t.sub.go, where t.sub.go, related to the range between the missile and the target divided by the rate of change in such range.