which indicates the degree of correlation of the signal with a replica of itself delayed in time by amount The envelope of this function equals 0.37 (63% decorrelation) when the following is satisfied, This corresponds to a time delay, This time delay is equivalent to the distance with C being the propagation velocity in the coax cable (approximately 3 x 10$ m/s). As mentioned before, the aperture radius should not exceed 1.3% of this dimension if the aperture efficiency losses due to decorrelation effects are to be held within 1%. For a radius of.500 meters then the reference spectral width should not exceed an easily achievable spectral width at 2.45 GHz. Therefore, incoherence effects due to a finite spectral width frequency reference is not expected to be a significant problem.
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