Azimuth Stacking Algorithm for Synthetic Aperture Radar Imaging

Abstract

Abstract-The aim of this paper is to present a frequency domain method for synthetic aperture radar (SAR) imaging. By using two consecutive linear mappings along Doppler and frequency domains, an azimuth-dependent SAR transfer function has been discovered. Based on this new transfer function, the SAR image can be reconstructed by the proposed azimuth stacking algorithm. The new algorithm can form SAR image at each azimuth position without DFT wrap around errors. If Chirp z-transform (CZT) is applied to carry out the two consecutive mappings (since they are linear mappings), the proposed algorithm will not require interpolations and thus its reconstructed image would be free of truncation errors. The new algorithm has been validated using both simulated and experimental ultrawideband/widebeam (UWB/WB) SAR data.

Overview of Ultrasound Imaging Algorithms Based on Synthetic Aperture Focusing Technique

“…This algorithm was used for nondestructive testing of concrete, because the traditional method will produce a wave packet deformation and had an ineffective focusing [12]. The basic idea of this method extracted reflected wave packet from the detection signals, and reconstructed the detection signal according to the distance correction [13]. It was an approximation of the original signals in order to eliminate deformation of the echo signals during wave propagation.…”