Improved SVD-stolt Focusing Techniques for High Squint SAR Acuired from Curved Orbit

This paper proposes two techniques to improve the imaging quality of the SVD-Stolt algorithm when the synthetic aperture radar signal is acquired with high-squint and curved orbit geometry. The SVD-Stolt algorithm is known as an efficient imaging algorithm that works with any acquisition geometry using a numerical optimization on the simulated echo from reference points. This paper suggests two modifications to improve the image quality: setting the reference points along the beam direction and adding a new correction term. The experimental results show that error in the numerical optimization is reduced, and the imaging quality is improved when the squint angle is large and the orbit is curved.