An Improved SAR Imaging Algorithm Based on a Two-Dimension-Separated Algorithm

Usually positive side imaging that the direction of the beam is vertical to the direction of motion is used in SAR imaging, and high squint imaging can obtain the image of target ahead of time, therefore it has a certain practical significance. The general synthetic aperture radar algorithm including RD algorithm and CS algorithm only can be applied to small squint striped imaging. The high squint SAR signal characterizes a large range walk and a small range curvature. Many high squint SAR imaging algorithm realizing imaging through decoupling the range and azimuth dimension. This paper described an improved method based on a two-dimension-separated method. The new method takes the azimuth third order into account. Compared with the two-dimension-separated method, the improved method gets a better result through simulation.