A Fast Far-Field Pseudopolar Format Algorithm for Ground-Based Arc 3-D SAR Imaging

• Published in: IEEE geoscience and remote sensing letters Vol. 17; no. 10; pp. 1697 - 1701
• Main Authors: Huang, Zengshu, Sun, Jinping, Tan, Weixian, Huang, Pingping, Qi, Yaolong
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.10.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 3-D imaging; Algorithms; Apertures; arc synthetic aperture radar (SAR); Azimuth; Complexity; Computer applications; Computer simulation; far-field; Fast Fourier transformations; Format; Fourier transforms; Geometry; Imaging; Imaging techniques; Numerical simulations; pseudopolar format algorithm; Radar imaging; Radar polarimetry; SAR (radar); Synthetic aperture radar; Wavelengths
• ISSN: 1545-598X; 1558-0571
• DOI: 10.1109/LGRS.2019.2952164

Compared with the conventional 3-D synthetic aperture radar (SAR) system, the arc 3-D SAR can achieve a wide azimuth observation extent. In this letter, a far-field pseudopolar format imaging algorithm for the ground-based arc 3-D SAR is presented. Different from the existing algorithms, the proposed algorithm exploits keystone formatting and fast Fourier transforms (FFTs) to obtain a pseudopolar grid in the elevation direction, then complex multiplications and FFTs are performed in the range-azimuth wavenumber domain to complete 3-D focusing. The advantages of this method are its low computational complexity and high efficiency. The sampling criteria and computational complexity are also discussed in this letter. Finally, the performance of the proposed algorithm is validated with numerical simulations.