基于椭圆极坐标的一站固定式双基地低频UWB SAR FFBP成像处理

doi:10.3969/j.iss.0372-2012-2014.03.007

电子学报 ›› 2014, Vol. 42 ›› Issue (3): 462-468.DOI: 10.3969/j.iss.0372-2012-2014.03.007

基于椭圆极坐标的一站固定式双基地低频UWB SAR FFBP成像处理

谢洪途, 安道祥, 黄晓涛, 周智敏

国防科技大学电子科学与工程学院, 湖南长沙 410073

收稿日期:2012-11-23 修回日期:2013-08-23 出版日期:2014-03-25
- 作者简介:
- 谢洪途 男，1986年出生于湖南邵阳.现为国防科技大学电子科学与工程学院信息与通信工程专业博士研究生.研究方向为双站低频超宽带SAR成像技术.E-mail：hongtuxie@aliyun.com
- 基金资助:
- 国家自然科学基金 (No.61201329）

Fast Factorized Back Projection Algorithm Based on Elliptical Polar Coordinate for One-Stationary Bistatic Low Frequency UWB SAR Imaging

XIE Hong-tu, AN Dao-xiang, HUANG Xiao-tao, ZHOU Zhi-min

College of Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China

Received:2012-11-23 Revised:2013-08-23 Online:2014-03-25 Published:2014-03-25
- Supported by:
- National Natural Science Foundation of China (No.61201329)

摘要/Abstract

摘要： 一站固定式双基地低频UWB SAR具有方位移变的距离徙动和较长的合成孔径，这导致其距离方位耦合变得非常复杂，从而限制了频域算法的应用.为此，本文提出一种基于椭圆极坐标的一站固定式双基地低频UWB SAR FFBP算法.基于一站固定式双基地SAR的成像几何，分别推导了直角坐标与椭圆极坐标下后向投影算法的解析表达式，并讨论了双基地FFBP算法中采用椭圆极坐标的优势.然后分别从频带和斜距误差角度推导了子图像的采样间隔.最后讨论了该算法的实现过程和计算量.仿真结果证明了所提方法的有效性.

关键词: 一站固定式双基地合成孔径雷达, 椭圆极坐标, 低频, 超宽带, 快速因式分解后向投影

Abstract: One-stationary bistatic low frequency ultra wide band synthetic aperture radar (UWB SAR) has the azimuth-variant range cell migration and longer synthetic aperture,which greatly complicates the range-azimuth coupling and limits the application of frequency-domain algorithms.In this paper,a fast factorized back projection (FFBP) algorithm based on elliptical polar coordinate is presented to focus the one-stationary bistatic low frequency UWB SAR data.Based on the imaging geometry,the analytical expressions of the back projection (BP) algorithm in Cartesian coordinate and elliptical polar coordinate systems are derived,respectively.The advantage of implementing the bistatic FFBP algorithm in elliptical polar coordinate is analyzed.Then,the sampling requirements for subimages are deduced from the bandwidth and bistatic range error angles,respectively.Finally,the implementation and the computational burden of this algorithm are discussed.Simulation results prove the validity of the proposed approach.

Key words: one-stationary bistatic synthetic aperture radar, elliptical polar coordinate, low frequency, ultra wide band, fast factorized back projection

中图分类号:

TN957.5

谢洪途, 安道祥, 黄晓涛, 等. 基于椭圆极坐标的一站固定式双基地低频UWB SAR FFBP成像处理[J]. 电子学报, 2014, 42(3): 462-468.

XIE Hong-tu, AN Dao-xiang, HUANG Xiao-tao, et al. Fast Factorized Back Projection Algorithm Based on Elliptical Polar Coordinate for One-Stationary Bistatic Low Frequency UWB SAR Imaging[J]. Acta Electronica Sinica, 2014, 42(3): 462-468.

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基于椭圆极坐标的一站固定式双基地低频UWB SAR FFBP成像处理

Fast Factorized Back Projection Algorithm Based on Elliptical Polar Coordinate for One-Stationary Bistatic Low Frequency UWB SAR Imaging

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