Which of the following is NOT a method used by missile guidance radar?

Radar jamming is the correct choice here because it does not serve as a missile guidance method. Instead, it is a technique used to disrupt the radar signals of enemy systems, making it more difficult for them to track or target incoming missiles or aircraft.

In contrast, beam riding, homing, and passive homing are all active methods utilized for missile guidance.

Beam riding involves a missile following a predetermined radar beam that is directed toward the target. Homing refers to a missile's ability to detect and follow the source of radar or other signals from a target, allowing it to adjust its trajectory accordingly. Passive homing relies on the missile detecting the electromagnetic energy emitted from the target itself, allowing it to navigate without actively emitting its signals. Each of these methods focuses on guiding the missile toward its target effectively, while radar jamming is aimed at protecting against targeting rather than guiding a missile.