Abstract:

This paper studies at the wide-beam and high resolution imaging problem of the terminal guidance synthetic aperture radar (SAR), and an algorithm based on spectral analysis is proposed. Targets in the same initial range are taken as the objects of Doppler frequency analysis, and then the imaging geometric model is established. The echo signal phase, azimuth resolution and range cell migration are analyzed. The illuminated area is divided into several azimuth bands, and range cell migration correction, quadratic phase compensation and spectral analysis are done with corresponding parameter for each. A high resolution image of targets in the illuminated area is formed from the output of each processing. The whole flow of the algorithm is given. Simulations corroborate the validity of the algorithm.