Passive Millimeter-Wave Radiation Calculation of Chaff Cloud Based on a Hybrid Method

Chaff cloud is a kind of passive interference widely used in sea and air. There have been many studies on scattering characteristics of chaff clouds, but few studies on radiation characteristics. This article proposes a hybrid method combining ray tracing, the generalized equivalent conductor (GEC) method, and the calculation method of reflection and transmission by a layered medium (RTLM). The method is used to calculate the passive millimeter-wave radiation of a chaff cloud. Based on the GEC method and the RTLM calculation method, the nonuniform distribution of chaff fibers is taken into account in the improved method for calculating the emissivity, reflectivity, and transmittance of the chaff cloud. Then, by combining the improved method with ray tracing, the passive millimeter-wave radiation image of the chaff cloud is obtained. Simulation results of chaff clouds under different backgrounds are presented to verify the effectiveness and efficiency of the method. Additionally, the diffuse distribution of chaff clouds is investigated, and the passive millimeter-wave radiation of the diffuse chaff clouds is simulated and analyzed. The experimental results demonstrate the accuracy of the proposed method.