Which type of energy do homing systems not typically use?

Homing systems primarily rely on active or passive means of detecting and tracking targets, using various types of energy to guide themselves toward their objectives. The most common types of energy utilized in homing systems include radar, infrared (IR), and laser.

Radar is effective for locating and tracking objects at various distances, making it a typical choice for many missile systems. Infrared homing systems utilize heat signatures emitted from targets, which is particularly useful against heat-generating objects like aircraft or vehicles. Laser homing systems use focused beams of light to guide munitions toward targets, often seen in precision-guided munitions.

Ultrasound, on the other hand, while used in some specialized applications, is not a conventional method for homing systems. It is primarily used in underwater applications, such as sonar, rather than in air-to-air or air-to-ground missile systems. The use of ultrasound as a homing method is limited, which is why it does not typically feature in standard discussions of homing system energy types.