Volume integral method for calculation of weak scattering from electronically large dielectric targets

To calculate the high-frequency scattering fields from the weak scattering dielectric objects, starting with the vector and scalar wave equation separately, Born approximation and Rytov approximation are introduced to directly compute the radar cross section and extended to the high-frequency analysis of the electrical large weak scattering dielectric objects based on the volume integral equation. By weakening the mutual actions between the scattering field, the incident field and the total scattering field through this approximation, the complicated procedures for solving the matrix by the traditional method can be avoided, thus saving the computational resources and the time consumption. Numerical results show that the approach is accurate and effective.