Advanced Microwave Atmospheric Sounder (AMAS) Channel Specifications and T/V Calibration Results on FY-3C Satellite
Advanced Microwave Atmospheric Sounder (AMAS) Channel Specifications and T/V Calibration Results on FY-3C Satellite
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DOI：
10.1109/tgrs.2014.2324173
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发表时间：
2015
影响因子：
8.2
通讯作者：
He Jieying;Zhang Shengwei;Wang Zhenzhan
中科院分区：
文献类型：
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作者：
He Jieying;Zhang Shengwei;Wang Zhenzhan
先进微波大气探测器（AMAS）是风云三号C/D（FY-3C/D）星载微波湿度探测器的新一代，是对风云三号A/B星载微波湿度探测器的继承和发展。风云三号C卫星上的AMAS是一个15通道的总功率微波辐射计，范围为89-191 GHz，计划于2013年9月23日发射。与FY-3A/B上的MWHS相比，AMAS通过在118.75 GHz附近增加8个水平极化信道来改善信道特性，这是第一个在118 GHz氧气波段以地球扫描模式观测大气的极轨卫星传感器。此外，AMAS在183 GHz上的信道比MWHS多。分析了118.75GHz频段AMAS的信道容量和辐射特性。在FY-3C发射前，在2 m的热真空室中进行了AMAS的强热真空（T/V）试验，获得了AMAS的接收机非线性和各通道灵敏度等基本参数。在此基础上，通过对T/V数据的分析，推导出了系统非线性误差修正和温目标、冷目标偏差修正，并将其用于定标处理，在一、二级数据处理中发挥重要作用。AMAS校准通道的精度范围为0.48 ~ 2.7K。
The Advanced Microwave Atmospheric Sounder (AMAS) is the new generation of Microwave Humidity Sounder (MWHS) onboard the Feng Yun 3 C/D (FY-3C/D) satellite and follows the heritage and development of MWHS onboard the FY-3(A/B) satellite. AMAS onboard the FY-3C satellite is a 15-channel total power microwave radiometer in the range of 89-191 GHz scheduled to be launched on September 23, 2013. Compared to MWHS onboard FY-3A/B, AMAS improves channel characteristics by adding eight horizontal polarized channels near 118.75 GHz, which is the first operational polar-orbiting satellite-based sensor to observe the atmosphere in Earth-scanning mode in the 118-GHz oxygen band. Also, AMAS has more channels at 183 GHz than MWHS. This paper analyzes the channel capability and radiometric characteristics of AMAS at 118.75 GHz. Before the launch of FY-3C, the intensive thermal vacuum (T/V) tests for AMAS were carried out in a 2-m T/V chamber, and the basic parameters were obtained, such as the receiver nonlinearity and sensitivity of each channel for AMAS. Furthermore, system nonlinear error correction and bias correction of warm and cold targets are derived after the T/V data analysis and will be used for calibration processing, playing an important role in level 1 and 2 data processing. Accuracies of calibrated channels in AMAS range from 0.48 K to 2.7 K.