Approach of Electromagnetic Modeling for Chaff Clouds Formed by Exploding

As a typical and effective passive jamming, chaff has been widely used in electromagnetic countermeasures. The chaff cloud formed by the explosion of chaff bomb is one of the main ways to realize the self-defense interference of the aircraft and the ship target. Aiming at the two stages of chaff cloud formation process in this delivery mode: rapid dispersion stage and stable diffusion stage, the electromagnetic modeling method is studied. Firstly, the diffusion process and spatial distribution of chaff in the atmosphere are analyzed according to aerodynamics and stochastic theory; Then, the electromagnetic scattering calculation method of chaff clouds at two stages is derived respectively by using absorption theory and dipole radiation theory; Finally, the space varying RCS curve and the time varying RCS curve of chaff cloud are given by modeling and simulation. The simulation results are analyzed and some meaningful conclusions are obtained.