Interpolation methods in near-field millimeter-wave cylindrical scanning reconstruction algorithm

This paper researches four interpolation methods applied in near-filed millimeter-wave cylindrical scanning reconstruction algorithm, which include the closest point approximation, piecewise linear interpolation, cell interpolation and truncation SINC function interpolation. First, the reconstruction algorithm was deduced on the basis of Helmholtz wave equation. Second, the four interpolation methods were formulated, described and demonstrated. Finally, the imaging system was set up to verify the strengths and weakness of the four interpolation methods from the image quality, imaging entropy and the cost time of computation.