Which tracking method utilizes an incoming energy source to assist in target tracking?

The semi-active tracking method utilizes an incoming energy source to assist in tracking a target by employing a combination of both active and passive components. In a semi-active system, an external source (often a designated radar or laser) illuminates or provides energy to the target. The tracking system then detects the reflected signal from that energy, allowing it to maintain a lock on the target's position and movement.

This method contrasts with active tracking, where the system emits its own signal to determine the target's location, and passive tracking, which relies solely on detecting emissions from the target itself without any active energy input. By leveraging an external energy source, semi-active tracking benefits from improved accuracy and reduced risk of detection compared to fully active methods. This makes it particularly useful in various military and surveillance applications, where precision tracking of dynamic targets is essential.