Two Dimensional Position Correction Algorithm for High-Squint Synthetic Aperture Radar in Wavenumber Domain Algorithm

In the traditional high squint angle ω−k imaging algorithm, the impact of a high squint angle on azimuth and range positioning is not considered but does include two aspects: the azimuth position shift caused by a high squint angle and the impact of Stolt interpolation on range positioning under a high squint angle. From the viewpoint of the geometric features of data acquisition in high-squint SAR and the characteristics of the ω−k imaging algorithm, this paper analyzes the causes of azimuth position offsets and range position offsets. According to the causes, closed-form mathematical expressions quantifying these coupled spatial distortions are derived. The ω−k imaging algorithm process is adjusted, and the correction factor is embedded into the imaging process to achieve offset-free, high-resolution imaging in the case of high-squint SAR.