Analysis of Passive Millimeter Wave Detection Signal Based on Entropy Feature

It is easy to be planar metal and ground water mistakenly identified as an armored target, when the signal amplitude value was deemed as a decisive characteristic in passive millimeter wave detection system. Aiming at this problem, this paper proposes a new characteristic which named entropy. The extraction method of entropy is proposed from the point of view of the antenna temperature of typical objects in the millimeter wave passive detection. Studied a certain amount of samples detection signal's entropy. The results showed that the entropy of the armored targets and metal plane and ground water have obvious difference, the armored target recognition research provides a new analysis method and theoretical guidance.