A quadtree algorithm for high squint SAR imaging

In this paper, a quadtree algorithm is used for high squint SAR image reconstruction. It is very difficult for current SAR-imaging algorithms to be used directly in high-squint configurations. This is due to the large range-cell migration and the nonnegligible cubic-phase term in the signal. Every preceding problem is eliminated by using backprojection at the expense of substantially greater processing time. The quadtree image formation technique is a computationally efficient approximation to standard convolution backprojection algorithm. A quantitative analysis and simulations show that this algorithm can process the SAR data with a high squint angle.