Analysis of wideband characteristics and jamming technology of chaff cloud

Chaff is one of the most effective means of jamming wideband imaging radar. This paper provides theoretical supports for designing chaff jamming schemes via analyzing wideband radar imaging characteristics of chaff cloud. Based on the diffusion characteristics and bistatic scattering theory of chaff cloud, HRRP characteristics of chaffs released at relatively low and high altitudes are obtained. Simulation results show that, due to the remarkable effects of relatively dense atmosphere, the chaffs released at a low altitude tend to diffuse dramatically and separate from the ejector soon. This will result in a wide-span but low-magnitude HRRP, and the ejector is generally easy to be distinguished from the chaff cloud. By contrast, due to the weak filtration of relatively thin atmosphere, the chaffs released at a high altitude tend to diffuse slowly around the ejector for a period. This will result in a narrow-span but high-magnitude HRRP, and the ejector is generally hard to be distinguished from the chaff cloud. The results could provide theoretical supports for the development of jamming and anti-jamming technologies of wide band radars.