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Baseline calibration of interferometric radiometers: experimental results

Extensive testing using two receivers and a digital correlator provides experimental validation of the visibility calibration for the Microwave Imaging Radiometer with Aperture Syntyesis (MIRAS). The comparator offset correction by onezero correlation, the self-iq correlation to get the quadrature error, the two-level four-point correlated noise injection to get amplitude and phase error and total power gain and offset, and the uncorrelated noise injection to measure residual offset are validated. The shape of the fringe washing function is obtained by processing three-delay correlations and the results compared with theoretical computations using receivers frequency response. All results show that both amplitude and phase calibrations are sufficiently accurate to satisfy for the instrument requirements in the Soil Moisture and Ocean Salinity (SMOS) mission.