Editing Missile guidance (section)

====Passive homing====
{{See also|passive radar|anti-radiation missile}}
[[Infrared homing]] is a passive system that homes in on the heat generated by the target. Typically used in the [[anti-aircraft]] role to track the heat of jet engines, it has also been used in the anti-vehicle role with some success. This means of guidance is sometimes also referred to as "heat seeking".<ref name="Chapter 15. Guidance and Control"/>

[[Contrast seeker]]s use a [[Charge-coupled device|video camera]], typically black and white, to image a field of view in front of the missile, which is presented to the operator. When launched, the electronics in the missile look for the spot on the image where the contrast changes the fastest, both vertically and horizontally, and then attempts to keep that spot at a constant location in its view. Contrast seekers have been used for air-to-ground missiles, including the [[AGM-65 Maverick]], because most ground targets can be distinguished only by visual means. However they rely on there being strong contrast changes to track, and even traditional [[camouflage]] can render them unable to "lock on".