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| Influence of Array Antenna Micro-motion on Forward-looking SAR Imaging and Compensation Study |
| Hou Hai-ping Qu Chang-wen Ding Can Yang Jian |
| Department of Electronic and Information Engineering, Naval Aeronautical & Astronautical University, Yantai 264001, China |
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Abstract Airborne forward-looking SAR based on array technology can supply high-resolution images of the area with respect to forward direction of the flight path. However, micro-motion of the array antenna may affect imaging. Extraction method of micro-motion characteristic parameters based on time-frequency analysis is proposed, and influence of array antenna micro-motion on forward-looking SAR imaging and the compensation method are investigated. Firstly, micro-motion model of array antenna is established based on antenna characteristic of forward-looking SAR, and compensation method of array antenna deformation is analyzed. Then, time-frequency characteristic of array antenna micro-motion is studied based on time-frequency analysis method. Finally, imaging simulation of point target in the condition of antenna micro-motion is done. Imaging results before and after compensation are compared combined with imaging characteristic. Results indicate that the established model and proposed method are correct and valid.
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Received: 15 July 2010
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Corresponding Authors:
Hou Hai-ping
E-mail: hhp_happy@163.com
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2011, Vol. 33 
