Nonlinearity Analysis For JPSS-1 ATMS Instrument
In this study, based on TVAC test data sets derived at different environment temperature, near-field radiation term was modeled as scan angle scene temperature dependent function of reflector emissivity and physical temperature. The correction model was applied to correct the blackbody brightness temperature of cold, warm and scene targets in calibration process, results show that there is distinct improvement in nonlinearity parameter accuracy. ARTS is a full radiance transformation system for JPSS ATMS TDR processing, and can be used as a test bed for microwave instrument calibration. The antenna emission corrected nonlinearity parameters derived from TVAC are applied in on-orbit calibration in ARTS, and was evaluated at selected channels at which the radiative transfer model simulation can be used as truth.