Fast ISAR motion compensation using improved stage-by-stage approaching algorithm

Abstract

This paper proposes a fast inverse synthetic aperture radar (ISAR) motion compensation (MOCOM) method. The various motion compensation methods using minimum entropy algorithm such as stage-by-stage approaching (SSA) algorithm were reported recently. However, the computational efficiency and the clearance of the ISAR image were hard to achieve simultaneously. In particular, as the number of the local minima in the entropy curve increases, the processing time takes longer to find the global minimum. In this paper, we propose a new MOCOM algorithm based on an improved SSA algorithm to reduce the processing time. The proposed algorithm uses the envelope value as the fitness function instead of the entropy value, so the number of the local minima in the entropy curve is reduced. Therefore, the entropy curve becomes simple and the required number of the phase error samples is reduced. In the simulation, the processing time is improved by 88.8% than the conventional SSA algorithm. Also, in the experiment, the processing time is improved by 87.9% ∼ 89.2%.

Keywords:

• ISAR
• motion compensation
• stage-by-stage approaching algorithm
• autofocus

Acknowledgments

This research was supported by the MSIT(Ministry of Science and ICT), Korea, under the ITRC(Information Technology Research Center) support program (IITP-2020-0-01778) supervised by the IITP (Institute of Information & Communications Technology Planning & Evaluation).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was supported by the MSIT (Ministry of Science and ICT), Korea, under the ITRC (Information Technology Research Center) support program [grant number IITP-2021-0-01778] supervised by the IITP (Institute of Information & Communications Technology Planning & Evaluation).

Notes on contributors

Jeong-Wook Kim

Jeong-Wook Kim received the B.S. degree in electronics engineering from Pusan National University (PNU), Busan, South Korea, in 2018, and M.S. degree in electronics and electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST) in 2020. He is currently working toward Ph.D. degree in electronics and electrical engineering from KAIST. His current research interests include RADAR system and signal processing, active phased array antenna system, wireless power charging system, invisible antenna.

Sol Kim

Sol Kim received the B.S in radio engineering from Chungnam National University (CNU), in 2018 and M.S in electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 2020. He is currently working toward Ph.D. degree in electrical engineering from Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea. His current research interests include microwave power transmission (MPT), near-field beamforming, RADAR system and signal processing, RF system applications and antenna design.

Hyunyoung Cho

Hyunyoung Cho received the B.S., and M.S. degrees in electrical engineering form the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 2018, 2020, respectively, where she is currently pursuing the Ph.D. degree. Her research interests include phased array antenna design, wireless communication systems, radar systems, and millimeter-wave RF systems.

Won-Young Song

Won-Young Song was born in Daejeon, South Korea, in 1986. He received the B.S. and Ph.D. degrees in electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 2008 and 2020. He is currently working as a senior researcher in Electronics and Telecommunications Research Institute (ETRI).

Jong-Won Yu

Jong-Won Yu received the B.S., M.S., and Ph.D. degrees in electronic engineering from Korea Advanced Institution Science and Technology (KAIST), Daejeon, Republic of Korea in 1992,1994, and 1998, respectively. From 1995 to 2000, he worked at Samsung Electronics. He also served Wide Tecom Head and Telson, from 2000 to 2001 and from 2001 to 2004, respectively. In February 2004, he joined as an Assistant Professor with electrical engineering at KAIST, where since February 2006. In February 2006, he worked as an Associate Professor with electrical engineering at KAIST, where since February 2014, he has been a Professor at KAIST. His research interests emphasize millimeter wave circuit and system, wireless power transfer system, wireless/near-field communication system, and RADAR system.