MOTION COMPENSATION FOR WIDE BEAM SAR BASED ON FREQUENCY DIVISION

• Published in: Journal of electronics (China) Vol. 25; no. 5; pp. 607 - 615
• Main Authors: Zheng, Xiaoshuang, Yu, Weidong, Li, Zaoshe
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2008; Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China; Graduate University, Chinese Academy of Sciences, Beijing 100049, China%Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
• Subjects: Electrical Engineering; Engineering; 合成孔径雷达; 运动补偿; 频率分配; Wide beam; Frequency division; Synthetic Aperture Radar (SAR); Motion errors; TN951
• ISSN: 0217-9822; 1993-0615
• DOI: 10.1007/s11767-007-0029-9

Aperture-dependent motion compensation is important for wide beam Synthetic Aperture Radar （SAR） data processing. This paper studies a wide beam motion compensation algorithm based on frequency division. It takes blocks along azimuth dimension in frequency domain and applies angle-variant motion compensation in time domain. With this frequency division based motion compensation approach, the effects of aperture-dependent residual phase errors are corrected precisely. The rationale and procedure of this algorithm are introduced in detail. Point targets and images of a P-band airborne SAR with motion errors are simulated to validate this algorithm. Compared with the wide beam motion compensation algorithms based on time division, the proposed algorithm has better performance, especially in terms of high-frequency motion errors.