红外与毫米波学报, 2016, 35 (3): 317, 网络出版: 2016-07-26
FY-3C微波温度计在轨辐射非线性定标新方法
On-orbit radiometric calibration for nonlinear of FY-3C MWTS
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.
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.
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. AN Da-Wei, GU Song-Yan, YANG Zhong-Dong, CHEN Wen-Xin. On-orbit radiometric calibration for nonlinear of FY-3C MWTS[J]. Journal of Infrared and Millimeter Waves, 2016, 35(3): 317.
PDF全文
