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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Ascending–Descending Bias Correction of Microwave Radiation Imager on Board FengYun-3C
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Ascending–Descending Bias Correction of Microwave Radiation Imager on Board FengYun-3C

机译：在船上船上微波辐射成像仪的上升偏差校正

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摘要

Microwave radiation imager (MWRI) is regarded as one of the most important microwave payloads on board China FengYun-3C Meteorological Satellite. The instrument suffers from calibration anomalies and exhibits observation-background (O-B) calibration bias difference between the ascending and descending passes at all channels (hereinafter AD bias). The calibration bias difference of MWRI between ascending and descending orbits hampers data assimilation in the numerical weather predictions and reanalysis systems. This paper proposes a physical-based correction algorithm for MWRI calibration, following a brief introduction to the calibration process of the instrument. The relationship between the observed brightness temperatures and the physical temperature of the hot load reflector is established to mitigate the intrusion of the emissive hot reflector at all channels which was not accurately estimated in the previous calibration process. Before-and after-correction comparisons using one-year observations show that the AD bias is effectively reduced, i.e., from similar to 2 K before correction to less than 0.2 K after correction, when rectifying the emissivity of the hot reflector in the calibration equation, whereas the change in the mean values of MWRI radiance is negligible.
机译：微波辐射成像仪（MWRI）被认为是中国丰云-3C气象卫星船上最重要的微波有效载荷之一。该仪器遭受校准异常，并且在所有通道（下文中广告偏见）处的上升和下降通过之间的观察背景（O-B）校准偏差差异。上升和下降轨道之间MWRI的校准偏差差异妨碍了数值天气预报和再分析系统中的数据同化。本文提出了一种基于物理的校正算法，用于仪器的校准过程简要介绍。建立了观察到的亮度温度与热负荷反射器的物理温度之间的关系，以减轻发射热反射器在先前校准过程中不准确地估计的所有通道的侵入。使用一年观测的校正比较前后比较表明，当在校正后校正之前，在校正后的校正前的比例与2k相似，即在校正方程中的热反射器的发射率下，可以有效地降低。 ，而MWRI辐射的平均值的变化可以忽略不计。

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