A Unified Focusing Algorithm for Several Modes of SAR Based on FrFT

Author

Sun, Guang-Cai ; Xing, Mengdao ; Xia, Xiang-Gen ; Yang, Jian ; Wu, Yaowu ; Bao, Zhen

Author_Institution

National Key Laboratory of Radar Signal Processing, Xidian University, Xi´an, China

Volume

51

Issue

5

fYear

2013

fDate

May-13

Firstpage

3139

Lastpage

3155

Abstract

Many imaging algorithms for different modes, such as, stripmap synthetic aperture radar (SAR), spotlight SAR, sliding spotlight SAR, and terrain observation by progressive scans (TOPS) SAR, of SAR have been studied. This paper is to obtain a unified focusing algorithm (UFA) for these SAR modes based on fractional Fourier transform. By defining the rotation-center range, the stripmap SAR and spotlight SAR can be treated as special cases of sliding spotlight SAR or TOPS SAR. Then, a parameterized focusing algorithm determined by the rotation-center range is presented. Data of each mode can be focused by utilizing UFA and selecting parameters or rotation angles. Some application aspects of UFA are also analyzed. Simulation and real data results are presented to validate the analysis and the proposed method.

Keywords

Algorithm design and analysis; Azimuth; Focusing; Fourier transforms; Signal processing algorithms; Synthetic aperture radar; Time frequency analysis; Fractional Fourier transform (FrFT); sliding spotlight synthetic aperture radar (SAR); spotlight SAR; stripmap SAR; synthetic aperture radar (SAR); terrain observation by progressive scans (TOPS) SAR; unified focusing algorithm (UFA);

fLanguage

English

Journal_Title

Geoscience and Remote Sensing, IEEE Transactions on

Publisher

ieee

ISSN

0196-2892

Type

jour

DOI

10.1109/TGRS.2012.2212280

Filename

6304916