Actually it is Detecting an Enemy Craft and Answer is RADAR
radar
Kayak
Radar
Infrared radiatyion is used in detecting enemy concentrations because Infrared radiation is not visible and in the meantime there are devices that can transfer its pictures and views into visible pictures and views.In the meantime, infrared radiation has no passive impact on personnel dealing with contrary to ultraviolet radiation.
"Aha" is a palindrome that can be used as a preposition.
Radar is an object-detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircrafts.
101 is the smallest palindrome.
kayak
kayak
A proximity sensor is used for detecting close objects by emitting an electromagnetic field. These are useful for detecting objects without touching them.
eye
radar