FY-3C MWHTS observed brightness temperature quality score based on the multi-source telemetry parameter quality control
- Vol. 26, Issue 11, Pages: 2147-2161(2022)
Published： 07 November 2022
DOI： 10.11834/jrs.20220130
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摘要
微波湿温探测仪（MWHTS）是中国第二代极轨气象卫星风云三号C星（FY-3C）的主要传感器之一，其观测资料的同化受到国内外科学家的广泛关注。卫星观测资料的精度和稳定性是决定其能否被同化及同化效果好坏的关键之一，而卫星平台环境变化和星上到地面进行数据传输时的误码都会直接影响观测资料精度和稳定性，从而影响资料的同化效果。为了解决这一问题，建立了多源遥测参数质量控制模型。首先从星上直接获取的FY-3C MWHTS原始数据包出发，对解码后影响仪器性能的各类遥测参数进行长时间（5年半）序列时变特征分析，建立质量控制方案，完成了多源遥测参数质量控制技术的开发；再从仪器定标原理和观测机理出发，提取直接影响MWHTS定标精度的5个关键参数（热源黑体温度、仪器温度、热源黑体观测计数值、冷空计数值和扫描周期），利用MWHTS实际观测亮温和快速辐射传输模式RTTOV正演模拟结果（O-B）对关键参数敏感性进行分析。结果表明，扫描周期质控对O-B结果影响最大，仪器温度质控的影响最小。基于敏感性分析结果得到五个关键参数对仪器定标质量的评分准则，用百分制对FY-3C MWHTS逐通道逐扫描线逐像元观测亮温进行评分，构建了MWHTS质量评分体系来刻画仪器观测数据的定标质量以保证数据的定量应用。该质量控制模型已经用于FY-3C MWHTS业务数据处理中，逐条扫描线逐通道逐像元的评分结果也写入到仪器L1级数据中对全球实时业务发布。
Abstract
FengYun-3C (FY-3C) is the first satellite of the second-generation polar-orbiting operational meteorological satellite in China. As one of the key payloads onboard FY-3C
the MicroWave Humidity and Temperature Sounder (MWHTS) is a cross-track microwave sounder and has 15 channels ranging from 89.0 GHz to 191.0 GHz
with eight (channels 2—9) located near 118.75 GHz along an oxygen absorption line
five (channels 11—15) close to the 183.31 GHz water vapor absorption line
and the remaining two window channels (1 and 10) centered at 89.0 and 150.0 GHz. This instrument’s measurement allows for probing the atmospheric temperature and moisture under clear and cloudy conditions. The MWHTS attracted worldwide attention because of its special configuration. FY-3C MWHTS radiance data have already been assimilated into operational numerical weather prediction models in the European Centre for Medium-Range Weather Forecasts
UK Met Office
and China Meteorological Administration. The calibration accuracy and stability of MWHTS can directly affect the data assimilation effects in NWP. This research establishes a quality control model and observed brightness temperature quality score for MWHTS to filter out the poor quality data during the calibration processing. The five and a half years historical raw data from MWHTS are analyzed. The telemetry parameters from the raw data considered in this study include the blackbody target temperature
instrument temperature
instrument component temperature
counts of the blackbody target and cold space
scan angles
and scan periods. These telemetry parameters thresholds were set accordingly for quality control. Then
based on the radiometer calibration transfer function and observation mechanism of MWHTS
five key parameters (instrument temperature
blackbody target temperature
blackbody view counts
cold space view counts
and scan periods) were selected to score the MWHTS calibration data quality. The sensitivity analysis of each parameter to the differences between the observations and radiance transfer simulations were carried out. The results show that the scan period has the most significant influence on the O-B results
and the instrument temperature has the least effect. The effect proportion was used as the weight to score the observed brightness temperature in centesimal system. The results show that the quality control scheme of each parameter can eliminate abnormal data
and the quality scoring system characterizes the MWHTS calibration quality
and the data application is ensured. The quality control model is established for FY-3C MWHTS to meet the application requirements of onboard microwave observation data. The threshold of the quality control mode depends on the various characteristics of the telemetry data in orbit. This model has been used in the operational calibration algorithm of FY-3C MWHTS
and the score results are included in the MWHTS L1 data to global real-time releases. The MWHTS observed brightness temperature quality score can indicate the data quality throughout the operational in-orbit radiometer calibration. The higher the score
the better the data quality. Accordingly
users can choose the score threshold for data availability according to the application requirements. The quality scoring system is based on only five key telemetry parameters
and more parameters will be analyzed to improve this system in the future.
关键词
风云三号C星MWHTS质量控制观测亮温评分遥测参数
Keywords
Fengyun-3CMicroWave Humidity and Temperature Sounder (MWHTS)quality controlobserved brightness temperature scoretelemetry parameters
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Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, National Satellite Meteorological CenterChina Meteorological Administration
PLA University of Science and Technology
National Satellite Meteorological Center, China Meteorological Administration
Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration
Numerical Weather Prediction Center of China Meteorological Administration
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