① (中国科学院电子学研究所电磁辐射与探测技术重点实验室 北京 100190) ② (中国科学院大学 北京 100049)
Vibration Error Analysis and Motion Compensation of Video Synthetic Aperture Radar
Zhao Yu-lu①② Zhang Qun-ying① Li-Chao① Ji Yi-cai① Fang Guang-you①
①( Key Laboratory of Electromagnetic Radiation and Detection Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ② (Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
Video Synthetic Aperture Radar (ViSAR) system offers high imaging frame rate, and high resolution, and it is consequently used to investigate and locate near-moving targets. Compared with microwave SAR, the practical application of ViSAR is restricted by motion compensation caused by short wavelength. Even slight platform vibrations cause significant variations in the phase of echo signal.Thus, it is imperative to analyze the motion compensation and the error of ViSAR. In this study, the results show that imaging is affected less in the direction of flight direction and by low vibration in the direction of the slant range. In contrast, high-frequency vibration in the direction of the slant range requires higher compensation accuracy. Given the particularity of ViSAR's motion compensation, a compensation scheme is designed to achieve high compensation precision .The effectiveness of the scheme is verified by ViSAR imaging simulation experiments.
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2015, Vol. 4 
