A modified chaff jamming recognition method of radar is investigated using grey relational analysis( GRA) based on the difference in echo correlation characteristics between a complex rigid target and chaff cloud in time domain. Slice method( SM),a novel modeling approach,is proposed to construct an electromagnetic scattering model of chaff cloud in a scenario with slowly moving platform that is targeted. The diffusion characteristics and echo characteristics of the chaff cloud are analyzed. The GRA of a real target and chaff cloud shows that the adjacent return waves have a good correlation for the target but a weak correlation for chaff cloud. Since the correlation degree of chaff cloud’s echo is far lower than that of a complex rigid target’s,the chaff jamming can be identified by setting a reasonable threshold. Simulation results are presented to verify the effectiveness of this method.
