An improved motion compensation method for high resolution UAV SAR imaging

作者：Fan BangKui; Ding ZeGang^*; Gao WenBin; Long Teng

来源：Science China Information Sciences, 2014, 57(12): 122301.

DOI：10.1007/s11432-014-5189-2

• motion error
• unmanned aero vehicle (UAV) SAR
• motion compensation (MOCO)
• range walk correction (RWC)
• high resolution

The polynomial and sinusoidal motion errors always exist in the unmanned aero vehicle (UAV) SAR due to the small size and low velocity of the platform, causing serious spectrum compressing/stretching and significant spectral replicas of the azimuth signal. The motion errors induce serious blurring of the SAR image and "ghost targets", and can hardly be precisely estimated by the conventional motion compensation (MOCO) method. In this paper, an improved MOCO method is proposed to estimate and eliminate the motion errors in the high resolution UAV SAR without high precision inertial navigation system (INS) data. The time domain range walk correction (RWC) operation in the coarse phase error estimation process of the proposed MOCO method is the key operation that ensures the estimation accuracy of the whole MOCO method. Finally, the validity of the improved MOCO method is verified by computer simulations and real UAV SAR data processing.

• 出版日期2014-12
• 单位北京市科学技术情报研究所; 北京理工大学