Title :
Expediting back-projection algorithm for circular SAR imaging
Author :
Haolin Li ; Lei Zhang ; Mengdao Xing ; Zheng Bao
Author_Institution :
Nat. Lab. of Radar Signal Process., Xidian Univ., Xi´an, China
Abstract :
The availability of an expediting back-projection (EBP) algorithm for circular synthetic aperture radar (CSAR) imaging is investigated. EBP works by dividing the full aperture into sub-apertures, and using a unified polar grid to generate sub-images. On the basis of the correspondence between the wavenumber domain and the phase history domain, EBP combines all sub-aperture spectrums into a full-aperture one and reconstructs the CSAR image followed by a two-dimensional (2D) fast Fourier transform. Without time-consuming 2D interpolation, EBP is capable of decreasing the loss of spectrum, while improving significantly the computational efficiency compared with direct BP.
Keywords :
fast Fourier transforms; image reconstruction; resistors; 2D FFT; CSAR imaging; EBP algorithm; WN domain; circular successive-approximation resistor imaging; expediting back-projection algorithm; image reconstruction; phase history domain; subaperture spectrum; time-consuming 2D interpolation; two-dimensional fast Fourier transform; unified polar grid; wavenumber domain;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2015.0348
