基于载体对消方法的腔体类目标散射特性研究

Scattering from cavity-type targets such as air intakes is an important part of scattering from stealth vehicles, and the existing studies on scattering from cavity-type targets do not give results on scattering characteristics of cavity-type targets after installation. By applying the carrier-to-cancellation technique to the electromagnetic scattering calculation of the cavity model, the scattering from the outer surface of the cavity can be effectively eliminated and more accurate scattering characteristics of the inner cavity can be obtained. Two cavity models with closed mouth surface and filled with absorbing materials are constructed, and the effectiveness and accuracy of the carrier-to-cancellation technique are verified by the point-frequency radar cross section (RCS), one-dimensional imaging and two-dimensional imaging of the cavity model. The numerical calculation results show that the contribution of the incident electromagnetic wave to the total scattering of the cavity is smaller for the internal scattering of the cavity in the angle range of 60° to 90°, and the contribution of the scattering from the outer surface of the cavity is larger, with a difference of more than 30 dB at ±90°. When analyzing the internal scattering of cavity-like targets such as air intakes in this angle range, the influence of the outer surface of the cavity must be effectively eliminated.