中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
增益对星载微波辐射计系统线性度的影响分析

文献类型:期刊论文

作者何杰颖; 张升伟; 赵瑾; 张瑜
刊名空间科学学报
出版日期2012
卷号32期号:3页码:449-454
关键词星载微波辐射计 检波器 两点定标 非线性误差
ISSN号0254-6124
其他题名Analysis of the System Linearity Caused by Gain Variation of Satellite-borne Microwave Radiometer
通讯作者peggy.hejieying@163.com
中文摘要针对星载微波辐射计中检波器的工作特性进行分析.观测固定目标时,通过调节AGC(Automatic GainControl)的大小,定量分析系统伏安特性曲线,对星载微波辐射计系统线性度进行定性分析.结果表明,通过调节AGC大小,系统增益发生变化,导致检波器工作区间发生微弱变化,通过两点定标不能完全消除由于增益引起的非线性误差.对一定亮温范围的观测目标进行分析,结果证明,AGC变化时反算亮温与实际目标亮温差值随观测亮温的变化而成非线性变化.从而证明,系统增益变化导致的亮温变化通过两点线性定标并不能完全消除.在系统正常工作或实时定标过程中,要尽量避免调节AGC值,保证微波辐射计系统工作在线性区间.
英文摘要The characteristics analysis of diode detector of satellite-borne microwave radiometer has been described.In this paper,given a certain observation target,the retrieved brightness temperatures changed correspondingly with the different values of system Automatic Gain Control(AGC). By adjusting the system gain,a little change happened for detector working range.The variation caused by nonlinearity of diode can not be completely eliminated by using two-point calibration method.The brightness temperatures retrieved in this paper are in a wide range of 3~350K.The experimental results demonstrate that there is obvious nonlinearity for brightness temperatures between retrievals minus actual values and observing values,which can not be eliminated by using two-point calibration.So,in the process of working and real-time calibration,the system must be assured working in approximately linear working range with a certain AGC value as possible.
学科主题微波遥感
收录类别CSCD
资助信息中国气象局公益性行业(气象)科研专项项目资助
语种中文
CSCD记录号CSCD:4572878
公开日期2014-12-15
源URL[http://ir.nssc.ac.cn/handle/122/3422]  
专题国家空间科学中心_微波遥感部
推荐引用方式
GB/T 7714
何杰颖,张升伟,赵瑾,等. 增益对星载微波辐射计系统线性度的影响分析[J]. 空间科学学报,2012,32(3):449-454.
APA 何杰颖,张升伟,赵瑾,&张瑜.(2012).增益对星载微波辐射计系统线性度的影响分析.空间科学学报,32(3),449-454.
MLA 何杰颖,et al."增益对星载微波辐射计系统线性度的影响分析".空间科学学报 32.3(2012):449-454.

入库方式: OAI收割

来源:国家空间科学中心

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