Mono-static RCS of Chaff Simulated Based on MoM

Abstract

Method of moment(MoM) is an effective numerical method for calculating electromagnetic scattering. In this paper, we derive the numerical formula for calculating the mono-static radar cross section(RCS) of chaff, and obtain the relationship between mono-static RCS of chaff with different lengths and the incident angle of radar wave. The parameter of average mono-static RCS of chaff per unit mass is introduced, and the relationships between the scattering parameter and the length and diameter of chaff are calculated. The simulation results show that the scattering parameter exhibits resonant peaks when the lengths of chaff are slightly less than integer multiples of half wavelength, and the peak values decrease with the increase of chaff’s lengths. The scattering parameter is also related to the chaff’s diameter. For 3 cm incident wave, when the diameter of chaff is near 17μm, the scattering parameter reaches the maximum value.