Journal of Systems Engineering and Electronics ›› 2021, Vol. 32 ›› Issue (2): 425-436.doi: 10.23919/JSEE.2021.000036

• DEFENCE ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

Approach for ISAR imaging of near-field targets based on coordinate conversion and image interpolation

Xingyu ZHOU1(), Yong WANG1,*(), Xiaofei LU2()   

  1. 1 School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China
    2 Jiuquan Satellite Launch Center, Jiuquan 732750, China
  • Received:2020-08-12 Online:2021-04-29 Published:2021-04-29
  • Contact: Yong WANG E-mail:zhou_xingy@163.com;wangyong6012@hit.edu.cn;luxf08@163.com
  • About author:|ZHOU Xingyu was born in 1995. He received his B.S. degree in the School of Electronics and Information Engineering in 2019 from Harbin Institute of Technology (HIT), Harbin, China, and he is now pursuing his Ph.D. degree in the School of Electronics and Information Engineering from HIT. His current research interests include ISAR imaging and micro-Doppler analysis. E-mail: zhou_xingy@163.com||WANG Yong was born in 1979. He received his B.S. degree and M.S. degree from Harbin Institute of Technology (HIT), Harbin, China, in 2002 and 2004, respectively, both in electronic engineering. He received his Ph.D. degree in information and communication engineering from HIT in 2008. He is currently a professor with the School of Electronics and Information Engineering in HIT. His main research interests include time frequency analysis of nonstationary signals, radar signal processing, and their application in SAR imaging. He has published more than 60 papers, and most of them appeared in the journals of IEEE Trans. on GRS, IET Signal Processing, Signal Processing, etc. He was selected for the Program for New Century Excellent Talents in University of Ministry of Education of China in 2012, and received the Excellent Doctor’s Degree Nomination Award in China in 2010. E-mail: wangyong6012@hit.edu.cn||LU Xiaofei was born in 1981. He received his B.S. degree and M.S. degree from Harbin Institute of Technology (HIT), Harbin, China, in 2002 and 2004, respectively, both in electronic engineering. He received his Ph.D. degree in control theory and control engineering from Tsinghua University in 2012. He is currently an engineer in Jiuquan Satellite Launch Center. His main research interests include target recognition, radar signal processing, and their practical application. E-mail: luxf08@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (61871146);This work was supported by the National Natural Science Foundation of China (61871146)

Abstract:

Inverse synthetic aperture radar (ISAR) imaging of near-field targets is potentially useful in some specific applications, which makes it very important to efficiently produce high-quality image of the near-field target. In this paper, the simplified target model with uniform linear motion is applied to the near-field target imaging, which overcomes the complexity of the traditional near-field imaging algorithm. According to this signal model, the method based on coordinate conversion and image interpolation combined with the range-Doppler (R-D) algorithm is proposed to correct the near-field distortion problem. Compared with the back-projection (BP) algorithm, the proposed method produces better focused ISAR images of the near-field target, and decreases the computation complexity significantly. Experimental results of the simulated data have demonstrated the effectiveness and robustness of the proposed method.

Key words: inverse synthetic aperture radar (ISAR), near-field imaging, image interpolation, back-projection (BP) algorithm