Azimuth dependence of quadratic range cell migration correction for the high squint synthetic aperture radar

For the high squint strip-map mode synthetic aperture radar (SAR), the range cell walk correction (RCWC) in azimuth time domain will bring space-variant along azimuth of quadratic range cell migration. To get the full resolution and quality of the image, the space-variant for the quadratic phase and the quadratic range cell migration in the azimuth must be taken account. In this paper, a novel processing algorithm for the space-variant of quadratic range cell migration is proposed. In the algorithm, the azimuth dependence component of quadratic range cell migration is implemented by the azimuth space-variant filtering in the range frequency domain. After that, the unified quadratic range cell migration can be corrected in the 2-D frequency domain. Simulation and airborne strip-map real data show the accurate and efficient of the proposed algorithm.