Research on electromagnetic scattering characteristics of strait composite random rough surface based on improved hybrid SBR/PO method

Due to simplicity, hybridization of shooting and bouncing ray (SBR) and physical optics (PO) has been widely used for fast scattering analyses. A composite random rough surface model is presented for describing the concave structure of strait environment. Monte Carlo method is used to build strait composite random rough surface, gauss spectral function is used to simulate ground part of strait, and Pierson Moskowitz (PM) spectral function is used to simulate ocean part of strait. Weighted inverse tangent function is presented to smooth adjacent region. The ray-density normalization (RDN) theory is introduced to improve the SBR method. In consideration of the inartificial cavity construction of strait in natural environment, the improved SBR/PO is used to calculate the electromagnetic scattering of the strait composite rough surface. Electromagnetic scattering characteristics of ground, ocean, and strait composite random rough surface are compared. The impacts of open area of strait concave structure on the curves of bistatic scattering coefficient (BSC) of horizontal-to-horizontal (HH) polarization of strait environment are analyzed. The influence of root mean square (RMS) of ground region on BSC of HH polarization is discussed. The numerical results can use for reference in the fields of remote sensing, detection and inversion of electromagnetic environment.