| FY-3C微波温度计在轨辐射非线性定标新方法 |
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| 引用本文： | 安大伟,谷松岩,杨忠东,陈文新.FY-3C微波温度计在轨辐射非线性定标新方法[J].红外与毫米波学报,2016,35(3):317-321. |
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| 作者姓名： | 安大伟 谷松岩 杨忠东 陈文新 |
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| 作者单位： | 中国气象局国家卫星气象中心,中国气象局国家卫星气象中心,中国气象局国家卫星气象中心 |
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| 基金项目： | 国家青年科学基金41105009 61527805 |
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| 摘 要： | 结合FY-3C微波温度计地面真空试验数据呈现出的高次特性,理论分析按照马克劳林展开的二极管方程呈现的高次项,分析FY-3C微波温度计在轨辐射非线性特性,设计了两点线性定标修正+三次方程非线性建模订正方法,对温度计的非线性特性偏差进行良好的校正和定标,该方法能够很好的对仪器高次曲线进行良好标定,结果采用O-B和与ATMS进行交叉比对方法进行验证,定标精度比使用国外常规U参数订正方法提高最高达4 K,显著提高全球大气三维温度产品性能.
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| 关 键 词： | 风云三号C星 微波温度计 二极管 定标 三次方程 |
| 收稿时间： | 2015/8/26 0:00:00 |
| 修稿时间： | 2015/9/16 0:00:00 |
On-orbit radiometric calibration for nonlinear of FY-3C MWTS |
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| AN Da-Wei,GU Song-Yan,YANG Zhong-Dong and CHEN Wen-Xin.On-orbit radiometric calibration for nonlinear of FY-3C MWTS[J].Journal of Infrared and Millimeter Waves,2016,35(3):317-321. |
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| Authors: | AN Da-Wei GU Song-Yan YANG Zhong-Dong and CHEN Wen-Xin |
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| Affiliation: | National Satellite Meteorological Center,CMA National Satellite Meteorological Center and CMA National Satellite Meteorological Center |
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| Abstract: | The temperature data measured with the microwave thermometer in the ground vacuum experiment suffer from a high-order nonlinearity, which cannot be properly calibrated with the traditional method. The origin of this high-order term was analyzed with the diode equation expressed in the form of Maclaurin expansion. A method combining the two-point linear correction with the cubic equation nonlinear correction was proposed to calibrate the deviation of the temperature data from the actual one. The method was verified through the cross-comparison of data from O-B and ATMS for the FY-3C microwave thermometer. The calibration precision reaches up to 4 K higher than that achieved using the U parameter correction method. |
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| Keywords: | FY-3C MWTS diode calibration three equations |
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