This paper focuses on the problem of the space-variance of the range-cell migration term for bistatic Synthetic Aperture Radar (SAR) and proposes a Scaled Inverse Fourier Transform (SIFT)-based imaging algorithm for the constant-offset configuration of bistatic SAR data processing. Range-cell migration correction is realized when two times phase multiplies and a convolution operation are executed. Because the imaging algorithm is based on a precise spectrum that has been deduced from the Geometry-Based Formula (GBF) algorithm, the proposed algorithm can handle the bistatic SAR data, which were obtained with a large baseline to ratio. The advantages and effectiveness of the proposed imaging method have been verified by simulated and comparable experiments. Moreover, unlike other scaling-imaging algorithms that are dependent on the frequency modulated characteristics of the signal, the SIFT imaging algorithm is also suitable for phase-coded signals, which are used in a wider range of applications.
Supported by the National Natural Science Foundation of China (No. 61222108, No. 60890072) and the National Research Program of China ("973" Program) (No. 2010CB731903)
About author: Chen Shichao(1985-), was born in Heilongjiang, China. He received the B.S.
degree in electrical engineering from Xidian University in 2009. He is currently working toward his Ph.D degree in Signal Processing at National Lab for Radar Signal Processing of Xidian University. His major research interests are radar imaging and ground moving target indication (GMTI), especially bistatic synthetic aperture radar (BiSAR). E-mail: chenshichao725@gmail.com.
Xing Mengdao(1975-), was born in Zhejiang, China. He received the Bachelor degree and the Ph.D degree in 1997 and 2002, respectively, from Xidian University, both in electrical engineering. He is currently a full professor with the National Key Laboratory for Radar Signal Processing, Xidian University. His research interests include SAR, ISAR and over the horizon radar (OTHR).
Zhang Shuangxi(1984-), was born in Fujian, China. He received the B.S. degree in technique of measuring control and instrument engineering from Xidian
University in 2008. He is currently working toward Ph.D degree in Signal Processing at National Key Lab of Radar Signal Processing of Xidian University. His major research interest is radar imaging (SAR).
Bao Zheng was born in Jiangsu, China. Currently, he is a professor with Xidian University and the chairman of the academic board of the National Key Lab of Radar signal Processing. He has authored or co-authored 6 books and published over 300 papers. Now, his research fields include space-time adaptive processing (STAP), radar imaging (SAR/ISAR), automatic target recognition (ATR) and over-the-horizon radar (OTHR) signal processing. Professor Bao is a member of the Chinese Academy of Sciences.
Cite this article:
Chen Shi-chao,Xing Meng-dao,Zhang Shuang-xi et al. A SIFT Algorithm for Bistatic SAR Imaging in Spaceborne Constant-offset Configuration (in English)[J]. JOURNAL OF RADARS, 2013, 2(1): 14-22.
2013, Vol. 2 
