G矩阵修正法在一维综合孔径微波辐射计成像中的应用
The Application of the G-matrix Modification Methods to the Imaging of the 1-D Synthetic Aperture Microwave Radiometer
查看参考文献18篇
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文摘
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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。 |
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其他语种文摘
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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. |
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来源
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电子与信息学报
,2019,41(11):2632-2638 【核心库】
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DOI
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10.11999/jeitdzyxxxb-41-11-2632
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关键词
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综合孔径辐射计
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成像算法
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G矩阵
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旁瓣恶化
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地址
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1.
中国科学院国家空间科学中心, 北京, 100190
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-5896 |
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学科
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电工技术 |
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基金
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国家自然科学基金
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北京市科技计划项目
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文献收藏号
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CSCD:6613664
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