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

作　　者：张爱丽 刘浩 武林 牛立杰 张成 陈雪 吴季 ZHANG Aili;LIU Hao;WU Lin;NIU Lijie;ZHANG Cheng;CHEN Xue;WU Ji(National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[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

出　　处：《电子与信息学报》2019年第11期2632-2638,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(41675035);北京市科技计划课题(Z161100002616033)~~

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。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.

关 键 词：综合孔径辐射计 成像算法 G矩阵 旁瓣恶化 

分 类 号：TM931[电气工程—电力电子与电力传动]