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文摘
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本文首先建立了综合孔径微波辐射计的信道模型,在此基础上分析了信道的幅度相位不平衡以及信道间串扰对反演亮温的影响,并给出了系统仿真结果.本文还提出了一种新的系统定标方案,与传统定标方法相比,该方法可以非常方便的获取高精度的系统调制G矩阵用于亮温反演. |
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其他语种文摘
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Theoretical channels model of synthetic aperture radiometer are presented.Based on this model,how amplitude imbal-ance, phase imbalance and mutual coupling between the different receiving channels effect brightness temperature retrieving is analyzed. The computer simulation results are also presented,in which the cause of the along-frack streaks usually appeared in the retrieved image is identified.In addition,a new system calibration approach is introduced to solve this problem: using digital I-Q vector modulators to simulate the point source in the antenna range,we can get more accurate G Matrix to retrieve the brightness temperature image.This new approach,as compared with the existing calibration methods,is especially suitable for in situ use. |
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来源
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电子学报
,2005,33(3):402-406 【核心库】
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关键词
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综合孔径微波辐射计
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信道不平衡
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串扰
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互耦
;
定标
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地址
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中国科学院空间科学与应用研究中心, 国家863计划微波遥感技术实验室, 北京, 100080
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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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0372-2112 |
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学科
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自动化技术、计算机技术 |
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基金
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国家863计划
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文献收藏号
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CSCD:1962436
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