空间科学学报2012，Vol.32Issue(3)：449-454,6.
增益对星载微波辐射计系统线性度的影响分析
Analysis of the System Linearity Caused by Gain Variation of Satellite-borne Microwave Radiometer
摘要
Abstract
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.关键词
星载微波辐射计/检波器/AGC/两点定标/非线性误差Key words
Satellite-borne microwave radiometer/detector/Automatic Gain Control(AGC)/Two-point calibration/Nonlinear error分类
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何杰颖,张升伟,赵瑾,张瑜..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):449-454,6.基金项目
中国气象局公益性行业（气象）科研专项项目资助 （）
