EM scattering calculation of large sea surface with SSA method at S, X, Ku, and K bands

The practical method, small slope approximation is employed to analyze EM scattering from sea surface. Considering the simulation of EM scattering from actual scene, the size of sea surface is very large and it should be much larger than the target's size if a target exists. However, the memory consumption is huge and always larger than the existing memory of personal computer (PC) when EM frequency is at X band or higher band. Here, the spectral decomposition modeling (SDM) is proposed to decrease memory consumption without reducing efficiency. The SDM method uses quite less memory to keep the data of large sea surface, so that the memory insufficient problem can be avoided. The scattering coefficients and Doppler spectra of the sea surfaces generated by the proposed method fit well with the results calculated by general method when interpolation method with four points is applied. Moreover, higher efficiency can be obtained by applying the compute unified device architecture-based parallel method for the SDM method involves less data to transmit than the general method.