Estimation of cloud-cleared radiances, without utilizing any supplementary sensors for INSAT-3D Sounder InfraRed window observations is presented here. This method utilizes simulated clear sky radiances by radiative transfer for TOVS (RTTOV) tool, with the help of global numerical weather prediction (NWP) models analysis and forecast fields, unlike the previously reported approaches where observations from auxiliary/collocated sensors are used. The validation of these derived cloud-cleared radiances is carried out with the already existing operational Level 2 (L2) cloud-cleared radiances of Atmospheric Infra-Red Sounder (AIRS) and Infrared Atmospheric Sounding Interferometer (IASI), where the retrieval is carried out utilizing auxiliary Microwave Sounders. Also, a comparative study with the optimal cloud-clearing technique has been carried out here, where the retrieval is done by utilizing the clear sky radiances by means of collocated high-resolution InfraRed observations with the help of auxiliary sensors. The results indicate the scope and promising potential of this technique towards the future operational endeavor of deriving the cloud-cleared radiances without any assistance of co-existing auxiliary hardware system.

此处介绍了估算的清除云的辐射量，而未使用任何用于INSAT-3D测深仪红外窗口观测的辅助传感器的情况。这种方法利用TOVS（RTTOV）工具通过辐射转移利用模拟的晴空辐射，借助全球数值天气预报（NWP）模型分析和预报领域，与之前报道的使用辅助/并置传感器进行观测的方法不同。这些导出的清除云层辐射的验证是使用大气红外测深仪（AIRS）和红外大气探测干涉仪（IASI）的已经存在的可操作的2级（L2）清除云层的辐射进行的，在其中进行检索利用辅助微波测深仪。还，在这里已经进行了使用最佳云清除技术的比较研究，其中通过借助辅助传感器并置的高分辨率红外观测，利用晴朗的天空辐射来进行检索。结果表明该技术的范围和潜在的潜力，可在无需任何辅助硬件系统共存的情况下获得清除云的辐射度的未来操作方法。