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Near Field Characterization of the GeoSTAR Demonstrator

The GeoSTAR proof of concept demonstrator can be characterized at close range by means of a simple near-to-far- field phase correction. This reduces the test set-up configuration to reasonable dimensions. In order to simulate the Earth as seen from GEO, the target consists of a disc of absorbent material at ambient temperature placed against the sky. This work presents the details of the near-to-far-field correction as well as some preliminary results that confirm its suitability to characterize the demonstrator.