基于低秩汉克尔矩阵重构技术的星载间断调频连续波SAR成像方法

闵林; 刘向前; 郝晓龙; 郭拯危; 李宁

doi:10.11999/JEIT220239

基于低秩汉克尔矩阵重构技术的星载间断调频连续波SAR成像方法

doi: 10.11999/JEIT220239

闵林^{1, 2, 3},
刘向前^{1, 2, 3},
郝晓龙⁴,
郭拯危^{1, 2, 3},
李宁^{1, 2, 3, ,}

1.
河南大学计算机与信息工程学院开封 475004
2.
河南大学河南省智能技术与应用工程技术研究中心开封 475004
3.
河南大学河南省大数据分析与处理重点实验室开封 475004
4.
北京跟踪与通信技术研究所北京 100094

基金项目: 国家自然科学基金(61871175)，河南省自然科学基金(222300420115)

详细信息

作者简介:
闵林：男，教授，研究方向为SAR图像与信号处理

刘向前：男，硕士生，研究方向为SAR成像技术

郝晓龙：男，助理研究员，研究方向为卫星遥感技术

郭拯危：女，教授，研究方向为SAR图像信息处理和生态环境SAR遥感应用

李宁：男，教授，研究方向为多模式合成孔径雷达成像及其应用技术

通讯作者:
李宁　hedalining@henu.edu.cn

中图分类号: TN957.52
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- 被引次数: 4
出版历程
- 收稿日期: 2022-03-29
- 修回日期: 2022-05-28
- 网络出版日期: 2022-06-14
- 刊出日期: 2023-04-10

Spaceborne Interrupted Frequency Modulate Continuous Wave SAR Imaging Based on Low-Rank Hankel Matrix Reconstruction Technique

MIN Lin^{1, 2, 3},
LIU Xiangqian^{1, 2, 3},
HAO Xiaolong⁴,
GUO Zhengwei^{1, 2, 3},
LI Ning^{1, 2, 3
, ,}

1.
College of Computer and Information Engineering, Henan University, Kaifeng 475004, China
2.
Henan Engineering Research Center of Intelligent Technology and Application, Henan University, Kaifeng 475004, China
3.
Henan Key Laboratory of Big Data Analysis and Processing, Henan University, Kaifeng 475004, China
4.
Beijing Institute of Tracking Telemetry and Telecommunication, Beijing 100094, China

Funds: The National Natural Science Foundation of China (61871175), The Natural Science Foundation of Henan Province (222300420115)

摘要

摘要: 间断调频连续波(IFMCW)合成孔径雷达(SAR)是一种新型的集轻量化、低成本和低功耗于一体的新型SAR系统。该系统采用单根天线发射和接收信号，颠覆了传统的调频连续波(FMCW) SAR系统设计理念。在该模式下，由于发射机工作时接收机关闭，导致合成孔径中出现周期性的间隔，采用传统成像算法进行成像，在聚焦SAR图像中将会出现周期性的虚假目标。为了有效地抑制虚假目标，该文基于子孔径回波数据，提出一种新的成像算法，即基于子孔径投影的低秩汉克尔矩阵重构技术(LHRTSP)。实验结果表明与现有方法相比，所提方法对虚假目标的抑制效果更佳，验证了所提方法的有效性。
- 合成孔径雷达 /
- 间断调频连续波 /
- 虚假目标 /
- 低秩汉克尔矩阵
Abstract: The Interrupted Frequency Modulated Continuous Wave (IFMCW) Synthetic Aperture Radar (SAR) is a novel type of SAR system,which has the advantages of light weight, low cost, and low power consumption. The system subverts the design concept of the traditional Frequency Modulated Continuous Wave (FMCW) SAR system, which use a single antenna to transmit and receive signals.In this system, the transmitter and receiver operate at different time intervals, resulting in periodic gaps in the synthetic aperture. When the received echo data is imaged using traditional imaging algorithms, the artifacts will appear in the focused SAR image. In order to suppress effectively the appearance of artifacts, this paper proposes a new imaging algorithm for subaperture echo data processing, which is called Low-rank Hankel matrix Reconstruction Technique based on Subaperture Projection (LHRTSP). The experimental results show that the proposed method has better suppression effect on artifacts compared with the existing methods, which verifies the effectiveness and superiority of the proposed method.
- Synthetic Aperture Radar (SAR) /
- Interrupted Frequency Modulated Continuous Wave (IFMCW) /
- Artifacts /
- Low-Rank Hankel matrix

HTML全文

图 1 星载IFMCW SAR正侧视条带成像几何关系图

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图 2 回波数据形式

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图 3 本文所提LHRTSP方法主要流程图

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图 4 缺失数据恢复流程图

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图 5 点目标成像结果

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图 6 点目标方位向剖面图

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图 7 所提方法面目标成像结果

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图 8 区域A放大图

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图 9 区域B放大图

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算法1　GIRAF算法
初始化: ${{X}^{{\text{(0)}}}}$ 和 $\varepsilon 0$
for n=1:I max
第1步：
利用公式(11)，构建格拉姆矩阵 ${{\boldsymbol{G}}}$
对 ${{\boldsymbol{G}}}$ 进行特征值分解
利用式(14)计算湮灭滤波器 ${{\boldsymbol{h}}}$
利用式(18)，将滤波器 ${{\boldsymbol{h}}}$ 转换为权重
第2步：
求解最小二乘问题：
通过ADMM迭代式(15)-式(17)，计算 ${{X}^{{\text{(}}n{\text{)}}}}$
if $0 < \varepsilon_n < \varepsilon_n - 1$ end
end

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表 1 星载IFMCW SAR模式仿真参数

参数	数值	参数	数值
雷达工作载频(Hz)	16.70	脉冲发射频率(Hz)	3479.00
雷达有效速度(m/s)	7613.00	天线长度(m)	4.48
带宽(MHz)	180.00	接收脉冲(个)	13
景中心斜距(km)	534.00	缺失脉冲(个)	12
发射脉冲时宽(μs)	266.71	斜视角(°)	0

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表 2 研究区域A和B中不同方法的定量分析

指标	IFMCW	AAIT	CS	LHRTSP
RMSE(A)	303.04	178.26	134.93	67.78
SSIM(A)	0.39	0.48	0.51	0.63
IE(A)	11.59	11.38	11.33	11.21
RMSE(B)	241.94	98.75	82.79	57.57
SSIM(B)	0.39	0.50	0.46	0.61
IE(B)	9.82	9.75	9.96	9.22

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