The dynamics and radar cross section density of chaff clouds

A new chaff cloud model is described which is based on fundamental principles with modifications based on laboratory observations. Excellent approximations to the exact physical model have been developed which can rapidly predict the chaff fiber density and orientation as a function of location, time and fiber characteristics. Using this information, the time varying RCS density is determined for any frequency and polarization anywhere within the chaff cloud. The results are consistent with full scale observations and the computational speed allows the model to be integrated into existing real time radar simulations.