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Fig. 1.

image

Two dual-polarized low-frequency antennas forming an interferometer. The signal of interest is the partially polarized field which is observed with a background noise Tsky. These signals combine to produce voltages at the antenna ports which are amplified and fed to the correlator. The inset shows the standard spherical coordinate system which we follow here. For a receiving antenna, the incident field propagates in direction such that the cross product relation is .

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