Terahertz near-field RCS analysis of complex aircraft targets

Terahertz frequency is high, and which is suitable for the realization of large signal bandwidth. At the same time, terahertz wave has benign anti-stealth and anti-interference ability. Terahertz radar can obtain the fine scattering characteristic information of the target, which is of important significance for target fine detection, target recognition and terminal guidance. However, because of the huge difference between the size of targets and the wavelength in the terahertz, the scattered near-field region of the target is up to tens of kilometers in distance. Therefore, In the terahertz band, most of the scattering targets are located in the near-field region. When the terahertz radar detects the target, the electromagnetic scattering should not be similar to the plane wave, and therefore the far-field radar scattering cross-sectional area theory is no longer applicable. It is absolutely vital to analyze the near-field electromagnetic scattering characteristics of the terahertz band. This report mainly carries out simulation analysis, and which calculation method is the Large element Physical Optics method. Firstly, the variation of the RCS of the standard target sphere and plate in the terahertz band with the distance is calculated and analyzed in the near-field. When it degenerates to the far-field, the calculation result satisfies the analytical solution of the standard target RCS, which verifies the correctness of the calculation method. Secondly, to analyze the RCS of the complex aircraft scale target in the terahertz band throughout 360°, and drawn the RCS distribution of the rectangular coordinate system and the polar coordinate system.