active guidance system

The active guidance system on SA-5 was similar to that of earlier flights.

This torpedo used one of the earliest active guidance systems and was introduced in 1949, but was classified as obsolete in the 1960s.

Available online:PDF According to this, the ASC-15 and the ST-90 were used in the active guidance system, while the ST-124 was part of the passenger system.

Phoenix was the first US fire-and-forget multiple launch radar-guided missile: one which used its own active guidance system to guide itself without help from the launch aircraft when it closed on its target.