What is a primary characteristic of semiactive radar missiles?

Semiactive radar missiles are designed to rely on continuous target information provided by an external source, such as a radar system. This means that once the missile is launched, it needs that guiding radar to illuminate the target throughout its flight. The missile itself does not generate its own radar signals to find the target; instead, it captures the radar reflection from the target illuminated by the off-board radar source.

This dependence on an external radar for guidance distinguishes semiactive radar missiles from other types that may have their own onboard guidance systems or operate autonomously. Understanding this characteristic is crucial for grasping the operational tactics associated with using semiactive radar missiles in combat scenarios.