Abstract:
Spatial-variant phase errors (PEs) are important factors which defocus the synthetic aperture radar (SAR) image. In time-domain SAR imaging, the exact calculation of inst...Show MoreMetadata
Abstract:
Spatial-variant phase errors (PEs) are important factors which defocus the synthetic aperture radar (SAR) image. In time-domain SAR imaging, the exact calculation of instantaneous range is carried out to realize imaging. Accurate trajectory is the key to compensate spatial-variant PEs and ensure image focus. Thus, an improved time-domain autofocus method based on three-dimensional motion errors (3-D MEs) estimation is proposed in this article. First, an improved maximizing-maximum-pixel-value method is used to estimate nonspatial-variant PEs. Meanwhile, a theoretical explanation combined with N -dimensional Euclidean space is described. Then, residual PEs and wrapped PEs are discussed successively. A part-overlapped partitioning scheme for sub-block images (SBIs) and a wrapped-PE model are proposed for 3-D MEs estimation. Then, the estimation problem is turned into a mixed integer programming problem, which can be solved by the combination of genetic algorithm (GA) and Tikhonov regularization. Finally, the well-focused image is obtained through updated trajectory. The effectiveness of the proposed method is proven by results of simulation and real SAR data processing.
Published in: IEEE Transactions on Geoscience and Remote Sensing ( Volume: 60)
Funding Agency:
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Tao Zhang was born in Tangshan, Hebei, China, in 1994. He received the B.S. degree in electronic and information engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree in signal and information processing with the National Laboratory of Radar Signal Processing.
His research interests include synthetic aperture radar (SAR) imaging and motion compensation.
Tao Zhang was born in Tangshan, Hebei, China, in 1994. He received the B.S. degree in electronic and information engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree in signal and information processing with the National Laboratory of Radar Signal Processing.
His research interests include synthetic aperture radar (SAR) imaging and motion compensation.View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Guisheng Liao (Senior Member, IEEE) was born in Guangxi, China, in 1963. He received the B.S. degree from Guangxi University, Nanning, China, in 1985, and the M.S. and Ph.D. degrees from Xidian University, Xi’an, China, in 1990 and 1992, respectively.
He is currently a Yangtze River Scholars Distinguished Professor with the National Laboratory of Radar Signal Processing and serves as the Dean of the School of Electronic En...Show More
Guisheng Liao (Senior Member, IEEE) was born in Guangxi, China, in 1963. He received the B.S. degree from Guangxi University, Nanning, China, in 1985, and the M.S. and Ph.D. degrees from Xidian University, Xi’an, China, in 1990 and 1992, respectively.
He is currently a Yangtze River Scholars Distinguished Professor with the National Laboratory of Radar Signal Processing and serves as the Dean of the School of Electronic En...View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Yachao Li (Member, IEEE) was born in Jiangxi, China, in 1981. He received the M.S. and Ph.D. degrees in electrical engineering from Xidian University, Xi’an, China, in 2005 and 2008, respectively.
He is currently a Professor with Xidian University. His research interests include synthetic apeture radar (SAR)/ISAR imaging, missile-borne SAR imaging, ground moving target indication (GMTI), matching and orientation of SAR ima...Show More
Yachao Li (Member, IEEE) was born in Jiangxi, China, in 1981. He received the M.S. and Ph.D. degrees in electrical engineering from Xidian University, Xi’an, China, in 2005 and 2008, respectively.
He is currently a Professor with Xidian University. His research interests include synthetic apeture radar (SAR)/ISAR imaging, missile-borne SAR imaging, ground moving target indication (GMTI), matching and orientation of SAR ima...View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Tong Gu was born in Anhui, China, in 1992. He received the B.S. degree in information engineering from Tongling University, Tongling, China, in 2013, and the M.S. degree in electrical engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree from the National Laboratory of Radar Signal Processing, Xidian University.
His research interests include synthetic apeture radar (SAR...Show More
Tong Gu was born in Anhui, China, in 1992. He received the B.S. degree in information engineering from Tongling University, Tongling, China, in 2013, and the M.S. degree in electrical engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree from the National Laboratory of Radar Signal Processing, Xidian University.
His research interests include synthetic apeture radar (SAR...View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Tinghao Zhang (Graduate Student Member, IEEE) was born in Xianyang, Shaanxi, China, in 1996. He received the B.S. degree in electronic and information engineering from Xi’an University of Technology, Xi’an, China, in 2018, where he is currently pursuing the Ph.D. degree in signal processing with the National Laboratory of Radar Signal Processing.
His research interests include bistatic synthetic apeture radar (SAR) forward...Show More
Tinghao Zhang (Graduate Student Member, IEEE) was born in Xianyang, Shaanxi, China, in 1996. He received the B.S. degree in electronic and information engineering from Xi’an University of Technology, Xi’an, China, in 2018, where he is currently pursuing the Ph.D. degree in signal processing with the National Laboratory of Radar Signal Processing.
His research interests include bistatic synthetic apeture radar (SAR) forward...View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Yongjun Liu was born in Shaanxi, China. He received the B.S. degree in electronic engineering and the Ph.D. degree in signal and information processing from Xidian University, Xi’an, China, in 2013 and 2019, respectively.
From 2017 to 2019, he was a Visiting Ph.D. Student with the Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, PA, USA. He is currently a Lecturer with the National Laborator...Show More
Yongjun Liu was born in Shaanxi, China. He received the B.S. degree in electronic engineering and the Ph.D. degree in signal and information processing from Xidian University, Xi’an, China, in 2013 and 2019, respectively.
From 2017 to 2019, he was a Visiting Ph.D. Student with the Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, PA, USA. He is currently a Lecturer with the National Laborator...View more
Contents National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Tao Zhang was born in Tangshan, Hebei, China, in 1994. He received the B.S. degree in electronic and information engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree in signal and information processing with the National Laboratory of Radar Signal Processing.
His research interests include synthetic aperture radar (SAR) imaging and motion compensation.
Tao Zhang was born in Tangshan, Hebei, China, in 1994. He received the B.S. degree in electronic and information engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree in signal and information processing with the National Laboratory of Radar Signal Processing.
His research interests include synthetic aperture radar (SAR) imaging and motion compensation.View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Guisheng Liao (Senior Member, IEEE) was born in Guangxi, China, in 1963. He received the B.S. degree from Guangxi University, Nanning, China, in 1985, and the M.S. and Ph.D. degrees from Xidian University, Xi’an, China, in 1990 and 1992, respectively.
He is currently a Yangtze River Scholars Distinguished Professor with the National Laboratory of Radar Signal Processing and serves as the Dean of the School of Electronic Engineering, Xidian University. Since 2009, he has been the evaluation expert for the International Cooperation Project of Ministry of Science and Technology in China. Since 2007, he has been leading the Yangtze River Scholars Innovative Team and devoted in advanced techniques in signal and information processing. Since 2006, he has been serving as the Panelist for the medium- and long-term development plan in high-resolution and remote sensing systems. From 1999 to 2000, he was a Senior Visiting Scholar with the Chinese University of Hong Kong, Hong Kong. He has authored or coauthored several books and of more than 200 publications. His research interests include array signal processing, space-time adaptive processing, radar waveform design, airborne/space surveillance, and warning radar systems.
Guisheng Liao (Senior Member, IEEE) was born in Guangxi, China, in 1963. He received the B.S. degree from Guangxi University, Nanning, China, in 1985, and the M.S. and Ph.D. degrees from Xidian University, Xi’an, China, in 1990 and 1992, respectively.
He is currently a Yangtze River Scholars Distinguished Professor with the National Laboratory of Radar Signal Processing and serves as the Dean of the School of Electronic Engineering, Xidian University. Since 2009, he has been the evaluation expert for the International Cooperation Project of Ministry of Science and Technology in China. Since 2007, he has been leading the Yangtze River Scholars Innovative Team and devoted in advanced techniques in signal and information processing. Since 2006, he has been serving as the Panelist for the medium- and long-term development plan in high-resolution and remote sensing systems. From 1999 to 2000, he was a Senior Visiting Scholar with the Chinese University of Hong Kong, Hong Kong. He has authored or coauthored several books and of more than 200 publications. His research interests include array signal processing, space-time adaptive processing, radar waveform design, airborne/space surveillance, and warning radar systems.View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Yachao Li (Member, IEEE) was born in Jiangxi, China, in 1981. He received the M.S. and Ph.D. degrees in electrical engineering from Xidian University, Xi’an, China, in 2005 and 2008, respectively.
He is currently a Professor with Xidian University. His research interests include synthetic apeture radar (SAR)/ISAR imaging, missile-borne SAR imaging, ground moving target indication (GMTI), matching and orientation of SAR image, real-time signal processing based on field-programmable gate array (FPGA) and digital signal processing (DSP) technology, and distributed radar.
Yachao Li (Member, IEEE) was born in Jiangxi, China, in 1981. He received the M.S. and Ph.D. degrees in electrical engineering from Xidian University, Xi’an, China, in 2005 and 2008, respectively.
He is currently a Professor with Xidian University. His research interests include synthetic apeture radar (SAR)/ISAR imaging, missile-borne SAR imaging, ground moving target indication (GMTI), matching and orientation of SAR image, real-time signal processing based on field-programmable gate array (FPGA) and digital signal processing (DSP) technology, and distributed radar.View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Tong Gu was born in Anhui, China, in 1992. He received the B.S. degree in information engineering from Tongling University, Tongling, China, in 2013, and the M.S. degree in electrical engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree from the National Laboratory of Radar Signal Processing, Xidian University.
His research interests include synthetic apeture radar (SAR)/ISAR imaging, multiple input–multiple output synthetic aperture radar (MIMO-SAR), ground moving target indication (GMTI), and three dimensional synthetic aperture radar (3-D-SAR).
Tong Gu was born in Anhui, China, in 1992. He received the B.S. degree in information engineering from Tongling University, Tongling, China, in 2013, and the M.S. degree in electrical engineering from Xidian University, Xi’an, China, in 2016, where he is currently pursuing the Ph.D. degree from the National Laboratory of Radar Signal Processing, Xidian University.
His research interests include synthetic apeture radar (SAR)/ISAR imaging, multiple input–multiple output synthetic aperture radar (MIMO-SAR), ground moving target indication (GMTI), and three dimensional synthetic aperture radar (3-D-SAR).View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Tinghao Zhang (Graduate Student Member, IEEE) was born in Xianyang, Shaanxi, China, in 1996. He received the B.S. degree in electronic and information engineering from Xi’an University of Technology, Xi’an, China, in 2018, where he is currently pursuing the Ph.D. degree in signal processing with the National Laboratory of Radar Signal Processing.
His research interests include bistatic synthetic apeture radar (SAR) forward-looking imaging and motion compensation.
Tinghao Zhang (Graduate Student Member, IEEE) was born in Xianyang, Shaanxi, China, in 1996. He received the B.S. degree in electronic and information engineering from Xi’an University of Technology, Xi’an, China, in 2018, where he is currently pursuing the Ph.D. degree in signal processing with the National Laboratory of Radar Signal Processing.
His research interests include bistatic synthetic apeture radar (SAR) forward-looking imaging and motion compensation.View more
National Laboratory of Radar Signal Processing, Xidian University, Xi’an, China
Yongjun Liu was born in Shaanxi, China. He received the B.S. degree in electronic engineering and the Ph.D. degree in signal and information processing from Xidian University, Xi’an, China, in 2013 and 2019, respectively.
From 2017 to 2019, he was a Visiting Ph.D. Student with the Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, PA, USA. He is currently a Lecturer with the National Laboratory of Radar Signal Processing, Xidian University. His research interests include integrated waveform design, target detection, and array signal processing.
Yongjun Liu was born in Shaanxi, China. He received the B.S. degree in electronic engineering and the Ph.D. degree in signal and information processing from Xidian University, Xi’an, China, in 2013 and 2019, respectively.
From 2017 to 2019, he was a Visiting Ph.D. Student with the Department of Electrical and Computer Engineering, Lehigh University, Bethlehem, PA, USA. He is currently a Lecturer with the National Laboratory of Radar Signal Processing, Xidian University. His research interests include integrated waveform design, target detection, and array signal processing.View more
