Open AccessExpediting back‐projection algorithm for circular SAR imaging
Author(s) -
Li Haolin,
Zhang Lei,
Xing Mengdao,
Bao Zheng
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.0348
Subject(s) - synthetic aperture radar , algorithm , interpolation (computer graphics) , computer science , aperture (computer memory) , projection (relational algebra) , inverse synthetic aperture radar , expediting , fourier transform , computer vision , optics , radar imaging , mathematics , radar , physics , image (mathematics) , telecommunications , engineering , acoustics , mathematical analysis , systems engineering
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.