学术报告|OFDM SAR Imaging

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合成孔径雷达（SAR）诞生于20世纪50年代，作为全天候传感器，其巨大的军事和商业价值得到了广泛应用。为了实现长距离成像，需要使用足够长时间的脉冲来携带足够多的能量，但在接收端来自不同散射体的脉冲会相互重叠，造成不同散射体之间的能量干扰。为了减轻干扰并达到良好的分辨率，使用频率或相位调制对发射脉冲进行编码，得到线性调频、步进频率信号和随机噪声类型信号，这与通信中的扩频方法一致，因此可以借鉴通信中的信号方法来改善SAR成像。近年来，通信技术中的正交频分复用（OFDM）信号由于具有正交性以及大带宽特性被广泛应用于合成孔径成像（SAR）研究中。相比传统SAR成像，由于其信号的独特性，OFDM SAR在成像上具有一定优势，但也面临着很多挑战。特拉华大学夏香根教授在“雷达学报第五届青年科学家论坛”上做了题为“OFDM SAR Imaging”的特邀报告，对OFDM SAR成像所面临的问题进行了详细梳理与总结。报告PPT主要内容如下。 

专家简介

Xiang-Gen Xia received his B.S. degree in mathematics from Nanjing Normal University, Nanjing, China, and his M.S. degree in mathematics from Nankai University, Tianjin, China, and his Ph.D. degree in electrical engineering from the University of Southern California, Los Angeles, in 1983, 1986, and 1992, respectively. He is currently the Charles Black Evans Professor, Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware, USA. Dr. Xia was the Kumar’s Chair Professor  Group Professor (guest)  in Wireless Communications, Tsinghua University, during 2009-2011, the Chang Jiang Chair Professor (visiting), Xidian University, during 2010-2012, and the WCU Chair Professor (visiting), Chonbuk National University, during 2009-2013. Dr. Xia’s current research interests include space-time coding, MIMO and OFDM systems, digital signal processing, and SAR and ISAR imaging. He is the author of the book Modulated Coding for Intersymbol Interference Channels (New York, Marcel Dekker, 2000). Dr. Xia received the National Science Foundation (NSF) Faculty Early Career Development (CAREER) Program Award in 1997, the Office of Naval Research (ONR) Young Investigator Award in 1998, and the Outstanding Overseas Young Investigator Award from the National Nature Science Foundation of China in 2001. He is currently serving and has served as an Associate Editor for numerous international journals including IEEE Transactions on Signal Processing, IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing, IEEE Transactions on Vehicular Technology, and Science ChinaInformation Sciences.  Dr. Xia is Technical Program Chair of the Signal Processing Symp., Globecom 2007 in Washington D.C. and the General Co-Chair of ICASSP 2005 in Philadelphia. He is a Fellow of IEEE. 

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