Abstract:

In this paper,a two-dimensional Fourier domain SAR raw signal simulation algorithm with large squint angles is presented. There exists serious coupling between azimuth and range for synthetic aperture radar (SAR) in large squint mode. It is difficult to simulate this coupling using traditional frequency-domain algorithm. Therefore,the geometric model of large squint mode SAR and reason of coupling are both analyzed. We modify the traditional frequency-domain algorithm to handle the large squint mode. The key of algorithm is to use a linear range cell migration correction to simulate the range-azimuth coupling. The results show that the algorithm improves both the computational efficiency and the simulation accuracy. Simulation results demonstrate the validity of the proposed algorithms.

Key words: raw signal simulation;Synthetic Aperture Radar;large squint mode SAR;range cell migration