Abstract: Based on the forming mechanism of the chaff cloud echo, the scattered power model of the chaff cloud is establish. It is noted that the scattered power loss and the coherent accumulation efficiency drop exist in the echo of the ripe chaff cloud. The expression for echo power losing ratio of the chaff cloud has been deduced. By comparing the estimation by this expression with the actual measurement data, the accuracy of this expression has been verified. The results in this paper can be used for the development of jamming and radar equipments.

Key words: chaff cloud, scattering losing ratio, coherent accumulation efficiency, echo power losing ratio