机载下视圆周SAR三维BP成像

›› 2010, Vol. 23 ›› Issue (12): 14-17.

机载下视圆周SAR三维BP成像

庞守宝, 张晓玲, 吴堃

(电子科技大学电子工程学院,四川成都〓610054)

出版日期:2010-12-15 发布日期:2010-12-30
作者简介:庞守宝(1983-),男,硕士研究生。研究方向:雷达成像技术,雷达信号处理。张晓玲(1964-),女,教授,博士生导师。研究方向:阵列信号处理、雷达成像技术、目标分类与识别技术。

Imaging of Downward-Looking 3D Circle-SAR by BP Algorithm

PANG Shou-Bao, ZHANG Xiao-Ling, WU Kun

(School of Electronic Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China)

Online:2010-12-15 Published:2010-12-30

摘要/Abstract

摘要：

结合机载下视三维SAR和曲线合成孔径雷达(CSAR),提出了一种下视圆周SAR的三维成像结构。在此结构下推导回波信号模型,发现回波信号中切航向和沿航向存在二维耦合项,使得传统的RD算法、CS算法、距离徙动算法等受限。后向投影算法(BP算法)通过二维场景搜索,避免了回波模型中耦合项的影响。文中分析了圆周SAR三维BP成像的机理,并给出了整个成像过程的流程图。仿真结果表明,圆周SAR能够精确地还原场景目标的三维信息,从而验证了此种结构的可行性和理论分析的正确性。

关键词: 曲线SAR;机载下视;三维成像;BP算法

Abstract:

Combining downward-looking 3D SAR and CSAR,we put forward an imaging structure of downward-looking 3D circle SAR.Deducing the receiving signal model,we find that it has the coupling term in along-track and cross-track direction,so the traditional RD,CS and Range Migration algorithm can't be used in this situation.The Back Projection algorithm avoids dealing with the coupling term by two-dimensional scene searching.The principle of 3D circle SAR by BP algorithm is analyzed and the flow charts of the whole imaging process are given in this paper.The three-dimensional simulation results verify the correctness of the analysis and the feasibility and effectiveness of the structure.

Key words: CSAR;Downward-looking;3D imaging;BP algorithm

中图分类号:

TN823⁺.27

庞守宝, 张晓玲, 吴堃. 机载下视圆周SAR三维BP成像[J]. , 2010, 23(12): 14-17.

PANG Shou-Bao, ZHANG Xiao-Ling, WU Kun. Imaging of Downward-Looking 3D Circle-SAR by BP Algorithm[J]. , 2010, 23(12): 14-17.