In-Orbit Calibration of FengYun-3C Microwave Radiation Imager: Nonlinearity Correction
In-Orbit Calibration of FengYun-3C Microwave Radiation Imager: Nonlinearity Correction
复制标题
风云三号C微波辐射成像仪在轨定标：非线性校正
DOI：
10.1109/tgrs.2020.3034302
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发表时间：
2021-09
影响因子：
8.2
通讯作者：
Songyan Gu
中科院分区：
文献类型：
--
作者：
Xinxin Xie;Kesong Dong;Weimin Yu;Wanting Meng;Songyan Gu
风云三号（FY-3C）是中国第二代极轨气象卫星。作为风云三号最重要的微波有效载荷之一，微波辐射成像仪（MWRI）一直在持续观测来自陆地和海面的辐射，并支持区域和全球尺度的数值天气预报。通过对冷端参考卫星的长期监测，发现2015年和2018年，由于临时断电/开机，MWRI观测出现不连续现象，导致部分通道的异常亮温（TB）跳变幅度高达2 ~ 3 K。对FY-3C MWRI运行状态的分析表明，接收系统偏离其最优运行状态对其非线性特性有显著影响。基于发射前阶段地面热/真空（T/V）测试结果，提出了一种将非线性与传感器的自增益控制（AGC）工作电压联系起来的校正算法，以缓解FY-3C MWRI的校准异常。通过与全球降水测量（GPM）微波成像仪（GMI）同步重叠观测数据的比较，进一步证实了FY-3C MWRI的非线性校正。结果表明，经过非线性校正后，FY-3C MWRI在除36v通道（自2016年10月以来检测到技术故障）之外的所有通道上的性能都得到了改善。
FengYun-3C (FY-3C) is the second-generation polar-orbiting meteorological satellite in China. As one of the most important microwave payloads deployed onboard FY-3C, microwave radiation imager (MWRI) has been continuously observing radiance originating from land and sea surface and supports numerical weather predictions at regional and global scales. With a long-term monitoring of the cold-end reference, MWRI onboard FY-3C was found suffering from discontinuous observations due to its temporary power-OFF/power-ON in the years of 2015 and 2018, resulting in anomalous brightness temperature (TB) jump up to 2–3 K in magnitude at some channels. Analysis of the operating status of FY-3C MWRI indicated that deviation of the receiver system from its optimal operating status affects the nonlinearity characteristics significantly. A correction algorithm, which relates nonlinearity to the autogain control (AGC) operating voltage of the sensor, is thus proposed on the basis of on-ground thermal/vacuum (T/V) test results in the prelaunch phase in order to mitigate the calibration anomalies of FY-3C MWRI. Nonlinearity correction of FY-3C MWRI is further corroborated by comparisons of simultaneously overlapping observations of global precipitation measurement (GPM) microwave imager (GMI). The results demonstrated that after nonlinearity correction the performance of FY-3C MWRI has been improved at all channels except for the 36-V channel where technical failures have been detected since October 2016.
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影响因子：
8.2
作者：
Rachael A. Kroodsma;D. McKague;C. Ruf
通讯作者：
Rachael A. Kroodsma;D. McKague;C. Ruf
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：
10.3390/rs10111770
发表时间：
2018-11
期刊：
Remote. Sens.
影响因子：
--
作者：
Ruanyu Zhang;Zhenzhan Wang;K. Hilburn
通讯作者：
Ruanyu Zhang;Zhenzhan Wang;K. Hilburn
影响因子：
8.2
作者：
Rachael A. Kroodsma;D. McKague;C. Ruf
通讯作者：
Rachael A. Kroodsma;D. McKague;C. Ruf
DOI：
10.1109/36.739079
发表时间：
1999
期刊：
IEEE Trans. Geosci. Remote. Sens.
影响因子：
--
作者：
M. Colton;G. Poe
通讯作者：
M. Colton;G. Poe