前视阵列SAR回波稀疏采样及其三维成像方法

doi:10.3969/j.issn.0372-2112.2017.01.011

电子学报 ›› 2017, Vol. 45 ›› Issue (1): 74-82.DOI: 10.3969/j.issn.0372-2112.2017.01.011

前视阵列SAR回波稀疏采样及其三维成像方法

刘向阳¹, 王静², 牛德智¹, 杜宇扬¹, 刘许刚¹

1. 西安通信学院, 陕西西安 710106;
2. 长安大学信息工程学院, 陕西西安 710064

收稿日期:2015-05-15 修回日期:2015-12-15 出版日期:2017-01-25
- 作者简介:
- 刘向阳,男,1982年3月出生,河北石家庄人.2010年获西安电子科技大学信息与通信工程专业博士学位,现为西安通信学院讲师、硕士生导师.目前主要研究方向:三维成像、信号仿真和运动目标检测.E-mail:xiangyangliu@mail.xidian.edu.cn;王静,女,1982年9月出生,陕西西安人.2009年获西安电子科技大学信息与通信工程专业博士学位.现为长安大学信息工程学院副教授、硕士生导师,目前主要研究方向为目标检测与估计、信号编码与设计.E-mail:jingwang@mail.xidian.edu.cn
- 基金资助:
- 国家自然科学基金 (No.61101243，No.61101238，No.61640006）; 陕西省自然科学基金 (No.2014JQ8300，No.2015JM6307）

The Method on Echo Sparse Sampling and Three-Dimensional Imaging for Forward-Looking Array SAR

LIU Xiang-yang¹, WANG Jing², NIU De-zhi¹, DU Yu-yang¹, LIU Xu-gang¹

1. Xi'an Communication Institute, Xi'an, Shaanxi 710106, China;
2. School of Information Engineering, Chang'an University, Xi'an, Shaanxi 710064, China

Received:2015-05-15 Revised:2015-12-15 Online:2017-01-25 Published:2017-01-25
- Supported by:
- National Natural Science Foundation of China (No.61101243, No.61101238, No.61640006); Natural Science Foundation of Shaanxi Province, China (No.2014JQ8300, No.2015JM6307)

摘要/Abstract

摘要：

针对高分辨前视阵列SAR三维成像系统面临的距离采样率高和回波数据量大的问题，本文利用地面散射源在三维空间中的稀疏性，提出距离频域和沿航向时域二维稀疏采样并稀疏重构地面三维图像的方法.从前视阵列SAR角度观察三维地面，地面散射源在距离向和沿航向二维空间中是稀疏的，在该二维方向上联合稀疏采样有望实现最佳的稀疏采样效果.为避免距离向时域稀疏采样造成的三维成像复杂化，提出利用子脉冲结合距离频域稀疏采样的方法来实现距离向稀疏采样.同时，结合地面散射源连续性特点，提出低信噪比情况下稳健的信号重构方法.与传统三维匹配滤波成像方法相比，本方法降低了距离采样率和回波数据量，并直接重构地面散射源信息以实现三维成像.

关键词: 三维成像, 前视阵列SAR, 稀疏采样, 压缩感知成像

Abstract:

For the problem of high slant-range sampling ratio and huge echo data volume in the high-resolution three-dimensional imaging system of forward-looking array SAR,the joint two-dimensional sparse sampling method in the domain of slant-range frequency and along-track time and its sparse reconstruction method for the three-dimensional imaging of the scene is presented,which is based on the sparse property of the scatterers in the three-dimensional space.From the perspective of forward-looking array SAR to observe the three-dimensional ground,the scatterers in the ground are sparse in the joint space of the slant-range direction and the along-track direction.To avoid the effect of the sparse sampling in the slant-range direction on the three-dimensional imaging,the solution of sub-pulse technique and the sparse sampling in the slant-range frequency is presented to accomplish the sparse sampling in the slant-range direction.Also,the sparse reconstruction method,which is combined with the continuity of the scatterers,is proposed to increase the robustness in the situation of low signal-to-noise ratio.Compared to the traditional imaging method with three-dimensional matched filtering,the method in this paper reduces the slant-range sampling ratio and the echo data volume,and the three-dimensional image can be directly reconstructed using the recovered scatterers.

Key words: three-dimensional imaging, forward-looking array SAR, sparse sampling, compressive sensing imaging

中图分类号:

TN959.3

刘向阳, 王静, 牛德智, 等. 前视阵列SAR回波稀疏采样及其三维成像方法[J]. 电子学报, 2017, 45(1): 74-82.

LIU Xiang-yang, WANG Jing, NIU De-zhi, et al. The Method on Echo Sparse Sampling and Three-Dimensional Imaging for Forward-Looking Array SAR[J]. Acta Electronica Sinica, 2017, 45(1): 74-82.

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前视阵列SAR回波稀疏采样及其三维成像方法

The Method on Echo Sparse Sampling and Three-Dimensional Imaging for Forward-Looking Array SAR

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