Abstract:

The microwave and millimeter wave radiometer wideband brightness temperature calibration system is established originally in China, which is composed of the wideband blackbody calibration targets, the Dicke type radiometer, the rotary table for space method of blackbody emissivity measurement, the high precision temperature control and measurement equipment. The research and calibration experimental platform is constructed to realize the calibration of microwave and millimeterwave radiometer, the calibration of blackbody calibration target’s output microwave brightness and the uncertainty analysis of microwave brightness calibration procedure in the 10 GHz to 220 GHz band. Finally, on the basis of the brightness transmission model of the microwave radiometer’s calibration system, the system level uncertainty is analyzed more accurately with the variation of the environment temperature.