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| Fast Wavenumber Domain Imaging Algorithm for Airborne Downward-looking Array 3D-SAR Based on Region of Interest Pick |
| Peng Xue-ming①②③ Wang Yan-ping①② Tan Wei-xian①② Hong Wen①② Wu Yi-rong①② |
①(National Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China)
②(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
③(University of Chinese Academy of Sciences, Beijing 100049, China) |
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Abstract 3D wavenumber domain imaging algorithm takes no approximation of the range course and owns high image reconstruction precision. The cross-track dimensional array length is much shorter than cross-track dimensional imaging swath in downward-looking array 3D SAR. In order to avoid wrapping during FFT operation, the echo signal should be zero-padded to the size of the imaging scene. Extortionate zero-padding operation causes high memory requirements and computation loads. Low zero-padding is required if Region Of Interest (ROI) is only dealted instead of the whole imaging scene which helps to boost the algorithm. In this paper, a method is introduced which accomplishes wave-propagation and along-track dimensional, wave-propagation and cross-track dimensional 2D imaging, then the ROI is determined based on the twice imaging results. Finally, the ROI is processed with 3D wavenumber domain imaging algorithm. The effectiveness of the introduced method is verified with experimental data.
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Received: 10 October 2012
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Corresponding Authors:
Peng Xue-ming
E-mail: yaotoufengshan2007@163.com
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2013, Vol. 35 
