A Fast Echo Evaluation Method of Chaff Cloud

Echo estimation of chaff cloud before they are put into use is a crucial issue in anti-electromagnetic interference. It is quite difficult to calculate the echo of the chaff cloud that contains millions of chaff elements. Comparing with the general numerical method in time-domain, a more efficient method to calculate the echo of the chaff cloud is proposed in this paper. A superposition strategy is introduced to calculate the echo by summarizing the echo of a single chaff element that is pre-stored in the database. This strategy is available when the interval length between any two elements in cloud is larger than two wavelengths. Then, we give the echo of the chaff cloud illustrated by two modulated incident signals.