The G-SDSU is the end-to-end satellite simulator unit, which can compute satellite-consistent Level-1 (L1) measurements (radiance/brightness temperature or backscatter) from the output of meso- or cloud-scale model simulations through passive microwave simulator, radar simulator, passive visible-IR simulator, LIDAR simulator, and broadband simulator through rigorous satellite orbit and scan geometry simulations. The G-SDSU has been coupled with various NASA high-resolution atmospheric model outputs, such as the NASA-Unified Weather Research and Forecasting (NU-WRF) model, the WRF with the Spectra Bin Microphysics (WRF-SBM), the Goddard Cumulus Ensemble (GCE) model, and the NASA Multi-Scale Modeling Framework (MMF), and the Goddard Earth Observing System 5 (GEOS5) via NetCDF format.