Terminal guidance

Common examples include long-range air-to-air missiles that use semi-active radar homing (SARH) during most of the missile's flight, and then use an infrared seeker or active radar homing once they approach their target.

This means that as one moves away from the radar, its accuracy continues to degrade while the signal grows weaker.

This leads to one of the most common types of radar-based missile guidance, semi-active radar homing, or SARH.

In these cases, some other form of guidance is used to get the missile into the range where the signal is stronger.

These systems often have many times the accuracy of solutions like SARH, but operate only at short ranges, on the order of a few kilometers.