Electromagnetic Scattering Analysis for Typical Satellite in the Lower Terahertz Region

In order to meet the requirements of terahertz radar for space target detection, the radar cross sections (RCS) of typical satellite targets in terahertz low frequency region is studied. A typical satellite target with rough body is established by using half edge data structure. The RCS distributions at different heights, root-mean-square, correlation lengths and different frequencies are calculated by using the hybrid method of Physical Optics method (PO), Shooting and Bouncing Ray method (SBR) and Truncated-wedge Incremental-length Diffraction Coefficients (TWILDCs). Based on the principle of turntable imaging, the scattering center distribution of satellite target with different roughness at 220GHz and 0.05m imaging resolution is simulated and analyzed. The results show that RCS and image are more sensitive to the fluctuation of the target surface, the frequency and incident angle in terahertz band.