<i><b>G</b></i>矩阵修正法在一维综合孔径微波辐射计成像中的应用

张爱丽; 刘浩; 武林; 牛立杰; 张成; 陈雪; 吴季

doi:10.11999/JEIT181067

G矩阵修正法在一维综合孔径微波辐射计成像中的应用

doi: 10.11999/JEIT181067

张爱丽^{1, 2},
刘浩^1, ,,
武林¹,
牛立杰¹,
张成¹,
陈雪¹,
吴季^{1, 2}

1.
中国科学院国家空间科学中心北京 100190
2.
中国科学院大学北京 100049

基金项目: 国家自然科学基金(41675035)，北京市科技计划课题(Z161100002616033)

详细信息

作者简介:
张爱丽：女，1991年生，博士生，研究方向为一维综合孔径微波辐射计高精度成像

刘浩：男，1978年生，研究员，研究方向为干涉式综合孔径辐射计的系统和信号处理

武林：男，1985年生，副研究员，研究方向是综合孔径辐射计理论与仪器研究

牛立杰：男，1974年生，博士生，研究方向为辐射计系统及定标技术

张成：男，1978年生，副研究员，研究方向为综合孔径辐射计系统和数据处理

陈雪：女，1982年生，助理研究员，研究方向为天线仿真设计

吴季：男，1958年生，研究员，研究方向为微波遥感及空间探测

通讯作者:
刘浩 liuhao@mirslab.cn

中图分类号: TM931
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出版历程
- 收稿日期: 2018-11-22
- 修回日期: 2019-03-11
- 网络出版日期: 2019-04-12
- 刊出日期: 2019-11-01

The Application of the G-matrix Modification Methods to the Imaging of the 1-D Synthetic Aperture Microwave Radiometer

Aili ZHANG^{1, 2},
Hao LIU^{1
, ,},
Lin WU¹,
Lijie NIU¹,
Cheng ZHANG¹,
Xue CHEN¹,
Ji WU^{1, 2}

1.
National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Natural Science Foundation of China (41675035), Beijing Science and Technology Plan (Z161100002616033)

摘要

摘要: 1维综合孔径微波辐射计通常会采用 G 矩阵模型法来实现亮温图像的重建。对于1维辐射计系统，成像过程主要包含：辐射计仪器观测2维全视场的目标场景亮温，得到1维的可见度函数采样值，再通过对系统参数矩阵 G 求逆来实现目标场景的1维图像重建。由于1维辐射计系统的采样基线只分布在空间频率域的1个维度上，所以在图像重建过程中，需要实现矩阵 G 从2维到1维的转换。对此，该文提出了两种适用于1维综合孔径微波辐射计成像的 G 矩阵修正方法。并针对目前已经完成的8单元辐射计地面样机系统和目前正在研制的10单元盐度计样机系统，通过理论分析和仿真实验，验证了 G 矩阵修正法对1维综合孔径微波辐射计成像结果的改善效果，以及对天线方向图旁瓣恶化所引入成像误差的有效抑制。
- 综合孔径辐射计 /
- 成像算法 /
- G矩阵 /
- 旁瓣恶化
Abstract: The G -matrix model method is usually used to achieve the brightness temperature reconstruction for the one-Dimensional (1-D) synthetic aperture microwave radiometer system. For the 1-D radiometer system, the imaging process mainly includes: the radiometer instrument observes the full field of view of the 2-D target scene maps, and obtains the 1-D samples of the visibility, and then inverts the system parameter matrix G to realize the reconstruction of the 1-D image of the target scene. Since the system sampling baselines are only distributed in the 1-D of the spatial frequency domain, in the process of the brightness temperature image reconstruction, the matrix G needs to realize 2-D to 1-D conversion. Therefore, two G -matrix modification methods are proposed to improve the imaging quality for the 1-D synthetic aperture microwave radiometer. For the 8-element ground radiometer prototype system and the 10-element salinity radiometer system, theoretical analysis and simulation experiments have verified that the G -matrix modification methods proposed in this paper can effectively improve the imaging results, and can effectively suppress the imaging error caused by the side-lobed degradation of the antenna patterns.
- Synthetic aperture radiometer /
- Imaging algorithm /
- G-matrix /
- Side-lobed degradation

HTML全文

图 1 仿真辐射计在轨观测的海洋目标场景的亮温图像

下载: 全尺寸图片幻灯片

图 2 样机系统单元天线在真实孔径方向上的方向图

下载: 全尺寸图片幻灯片

图 3 天线方向图采用取最大值方法实现2维向1维的转换

下载: 全尺寸图片幻灯片

图 4 样机辐射计采用G矩阵模型法的成像仿真结果

下载: 全尺寸图片幻灯片

图 5 样机辐射计采用G矩阵修正算法一得到的成像仿真结果

下载: 全尺寸图片幻灯片

图 6 10单元盐度计一个馈源天线在真实孔径方向上的方向图

下载: 全尺寸图片幻灯片

图 7 10单元盐度计辐射计系统分别采用G矩阵修正算法1和G矩阵修正算法2得到的成像仿真结果

下载: 全尺寸图片幻灯片

表 1 针对地面样机系统和盐度计辐射计系统，仿真G矩阵模型法、修正算法1和修正算法2的成像结果(K)

成像误差统计参数单位	8单元辐射计地面样机系统		10单元盐度计系统
成像误差统计参数单位	G矩阵模型法	修正算法1	修正算法1	修正算法2
RMSE	1.5553	0.1382	1.9834	0.1625
STD	1.5692	0.1387	0.3538	0.0696
MEAN	0.0058	0.0141	1.9521	0.1471

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