Infrared missiles primarily track their targets using what mechanism?

Infrared missiles primarily track their targets using heat signatures because they are designed to respond to the infrared radiation emitted by warm objects, such as aircraft or missiles. This mechanism takes advantage of the fact that most targets generate heat as a result of engine activity or surface temperature, making them visible in the infrared spectrum.

This tracking method allows infrared missiles to effectively lock onto and follow targets, especially in situations where other tracking systems, like radar, may be less effective due to countermeasures or environmental factors. Choosing heat signatures as the correct answer underscores the operational principles of many air-to-air and surface-to-air missile systems that utilize this technology to enhance their targeting accuracy and effectiveness.