The in-orbit performance of the Microwave Temperature Sounder (MWTS) onboard the Fengyun-3D (FY-3D) satellite is evaluated using the Community Radiative Transfer Model (CRTM) and the Radiative Transfer for the Television Infrared Observation Satellite Operational Vertical Sounder (RTTOV) model. Both radio-occultation data from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) Data Analysis and Archive Center and ERA-Interim analysis data from the European centre for Medium-Range Weather Forecasts are taken as inputs to the two fast radiative transfer models. The radio-occultation data are quality controlled and the collocation criterion between the radio-occultation data and the MWTS measurements is defined such that the spatial and temporal difference is <50 km and <3 h, respectively. The biases of MWTS channels 5–10 produced by both CRTM and RTTOV agree well over the oceans under clear sky conditions between 60° S and 60° N from July to December 2018. The mean biases simulated by the radio-occultation and ERA-Interim data are negative and the absolute values of the biases are <0.6 and <1.5 K for channels 5–10 of the MWTS, respectively. The biases at channels 4 and 11 between the CRTM and RTTOV simulations are inconsistent and require further investigation of the transmittance difference between the fast models. The standard deviation of the biases from the radio-occultation and ERA-Interim data are <0.5 and <1.8 K for the limited amount of collocated radio-occultation data. Asymmetrical patterns are detected for the MWTS through the scan angle-dependent bias. The long-term mean MWTS bias shows only a weak dependence on latitude, which suggests that biases do not vary systematically with brightness temperature.

使用社区辐射传输模型（CRTM）和电视红外观测卫星操作垂直探测器（RTTOV）的辐射传输评估了风云3D（FY-3D）卫星上的微波温度探测器（MWTS）的在轨性能。 ）模型。来自气象，电离层和气候星座观测系统（COSMIC）数据分析和存档中心的无线电掩星数据和来自欧洲中距离天气预报中心的ERA-中期分析数据均被用作两次快速辐射传输的输入楷模。无线电掩星数据受质量控制，并且定义了无线电掩星数据与MWTS测量值之间的搭配标准，以使空间和时间差异分别小于50 km和3 h。从2018年7月至2018年12月，在60°S至60°N的晴朗天空条件下，CRTM和RTTOV产生的MWTS通道5-10的偏差在海洋上非常吻合。数据为负，并且MWTS通道5-10的偏差绝对值分别为<0.6和<1.5K。CRTM和RTTOV模拟之间的通道4和11上的偏差不一致，需要进一步研究快速模型之间的透射率差异。对于有限数量的并置无线电掩星数据，来自无线电掩星和ERA-Interim数据的偏差的标准偏差为<0.5和<1.8K。通过依赖于扫描角度的偏置来检测MWTS的不对称图案。