The missile tracks RF emissions actually coming from the target, such as its own radar or communication signals. This is common in "anti-radiation" missiles. The Guidance Loop & Control
Radar homing is generally categorized by how the target is "illuminated" (lit up with radio waves) and where the receiver is located. Radar Homing Guidance for Tactical Missiles
To ensure a successful hit, the missile uses a feedback loop to constantly adjust its flight path. The missile tracks RF emissions actually coming from
Radar Homing Guidance for Tactical Missiles - Springer Nature To ensure a successful hit, the missile uses
The missile only has a receiver. It depends on a external radar source —typically from the launching aircraft or a ground station—to illuminate the target.
The missile carries its own radar transmitter and receiver. Once the target is within range, the missile "goes active," allowing it to operate as a "fire-and-forget" weapon.