In-Orbit Calibration Uncertainty of the Microwave Radiation Imager on board Fengyun-3C
In-Orbit Calibration Uncertainty of the Microwave Radiation Imager on board Fengyun-3C
复制标题
风云三号丙星微波辐射成像仪在轨标定不确定度
DOI：
10.1007/s13351-021-0220-1
复制
发表时间：
2021-12
影响因子：
3.2
通讯作者：
Xue Li
中科院分区：
文献类型：
--
作者：
Xinxin Xie;Wanting Meng;Jiakai He;Weimin Yu;Xue Li
本研究评估了中国极轨气象卫星风云三号丙（FY-3C）上微波辐射成像仪（MWRI）的在轨校准不确定度（CU）。 MWRI 的不确定性分析提供了与传感器校准系统的直接链接，并根据发射前和发射后测量来量化校准置信度。传感器的独特设计使得传感器校准的不确定度与热视图下测量的亮温（TB）的不确定度高度相关，而冷视图对校准置信度的影响可以忽略不计。当热负载反射器被太阳照射加热不均匀时，缺乏对热负载反射器发射的了解会显着影响MWRI在轨道下降过程中的校准精度。来自卫星和在轨环境的辐射污染可能通过热视图进入主反射器并进一步影响 CU，特别是在 10.65 GHz 信道上，其中主波束宽度比高频信道宽得多。所有通道的月平均 CU 均低于 2 K，具体取决于观测到的地球场景和在轨环境，并且所有通道的 CU 逐月变化也很明显。由于发射热负载反射器的不确定性，下降通道中的 CU 通常大于上升轨道中的 CU。此外，在 10.65 GHz 通道上发现海洋和陆地场景之间高达 1-K CU 的差异，而在 89-GHz 通道上这种差异小于 0.1 K。
This study evaluates the in-orbit calibration uncertainty (CU) for the microwave radiation imager (MWRI) on board the Chinese polar-orbiting meteorological satellite Fengyun-3C (FY-3C). Uncertainty analysis of the MWRI provides a direct link to the calibration system of the sensor and quantifies the calibration confidence based on the prelaunch and postlaunch measurements. The unique design of the sensor makes the uncertainty in the calibration of the sensor highly correlate to the uncertainty in the brightness temperature (TB) measured at the hot view, while the cold view has negligible impacts on the calibration confidence. Lack of knowledge on the emission of the hot-load reflector hampers the MWRI calibration accuracy significantly in the descending passes of the orbits when the hot-load reflector is heated nonuniformly by the solar illumination. Radiance contamination originating from the satellite and in-orbit environments could enter the primary reflector via the hot view and further impinge on the CU, especially at the 10.65-GHz channels where the main-beam width is much broader than that of higher-frequency channels. The monthly-mean CU is lower than 2 K at all channels, depending on the observed earth scenes and in-orbit environments, and the month-to-month variation of CU is also noticed for all channels. Due to the uncertainty in the emissive hot-load reflector, CU in the descending passes is generally larger than that in the ascending orbits. Moreover, up to 1-K CU difference between the ocean and land scenes is found for the 10.65-GHz channels, while this difference is less than 0.1 K at the 89-GHz channels.
登录
查看更多内容
影响因子：
8
作者：
J. Bates;J. Privette;Edward J. Kearns;W. Glance;Xuepeng Zhao
通讯作者：
J. Bates;J. Privette;Edward J. Kearns;W. Glance;Xuepeng Zhao
影响因子：
5.8
作者：
F. Carminati;N. Atkinson;B. Candy;Q. Lu
通讯作者：
F. Carminati;N. Atkinson;B. Candy;Q. Lu
风云三号C星微波辐射成像仪升序-降序偏差校正
影响因子：
8.2
作者：
Xinxin Xie;Shengli Wu;Hongxin Xu;Weimin Yu;Jiakai He;Songyan Gu
通讯作者：
Songyan Gu
DOI：
10.1002/jgrd.50809
发表时间：
2013-09
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
D. Tobin;H. Revercomb;R. Knuteson;Joe K. Taylor;F. Best;L. Borg;D. DeSlover;G. Martin;H. Buijs
通讯作者：
D. Tobin;H. Revercomb;R. Knuteson;Joe K. Taylor;F. Best;L. Borg;D. DeSlover;G. Martin;H. Buijs
影响因子：
8.2
作者：
T. Hewison
通讯作者：
T. Hewison