Recently, the smaller of the ESTEC CATR's has been moved to a new location in the ESTEC Test Centre. In the frame of the relocation, the original reflectors of the range were positioned and aligned in a brand new anechoic chamber. The commissioning phase of the new range included a quiet zone field probing in order to verify the range performance in the new situation and to identify direction of arrival of major reflections. During this exercise, it was realized that the criteria for Quiet Zone dimensions are rather arbitrary. The paper addresses a new figure of merit for range comparison in terms of accuracy. Peak to peak values and RMS have been recorded depending on the size of a hypothetic AUT. This analysis resulted in accuracy nomograms that allow ESA staff to easily assess measurement accuracy depending on antenna size and operational frequency. Similar nomograms elaborated for different CATR's could allow unbiased inter-range comparison. Moreover, a GRASP model of the facility has been developed based on the metrology measurement of the reflectors surfaces, relative position of range feed and AUT positioner.
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