Method of automatic recognition of helicopters flying at low altitudes

The use of thermal radiation for target recognition is a very effective method, since every object emits certain amounts of thermal energy that can’t be fully masked. In recent years a rapid development of IR target recognition devices can be observed. These devices are capable of detection and identification of low-flying objects at close distances. Such Infrared Search and Track Systems (IRSTs) successfully replace radar-based devices in air surveillance and weapon control applications.