Calibration of Co-Located Correlation Radiometers for the Case of Ignorable Crosstalk

We propose a calibration method of correlation radiometers for the case when cross-coupling between channels can be ignored. The method requires sources that are stable with respect to temperature, impedance match, and Excess Noise Ratio (ENR). This treatment establishes a rationale for source stability and describes how these desirable characteristics may be realized. Next, it describes a method by which correlation radiometers may be calibrated and compensated for gain and phase imbalance between channels while ignoring the presence of cross-coupling between them.