Anti-radiation missile

Early ARMs, such as the AGM-45 Shrike, were not particularly intelligent; they would simply home in on the source of radiation and explode when they got near it.

The ALARM has an added loiter mode, with a built-in parachute, enabling it to descend slowly until the radar activates, whereupon the rocket motor will re-ignite.

Even a temporary shut down of the enemy's missile guidance radar can be of a great advantage to friendly aircraft during battle.

Surface launched anti-radiation missiles also found application in the Israeli defense forces, such as an AGM-45 shrike variant which could be fitted on an M4 Sherman tank chassis.

[8] Due to experiences with jamming by US-built aircraft in Vietnam and during Middle Eastern wars in the late 1960s, the Soviet Union designed an alternative tracking mode for their S-75 (SA-2) missiles, which allowed them to track a jamming target without needing to actively send out any radar signals.

This was achieved by the SAM site's radar receiver locking on to radio noise emissions generated by an aircraft's jamming pod.