An efficient iterative procedure to correct the positioning errors in the plane-polar scanning

A technique to effectively compensate known positioning errors in a near field - far field (NF-FF) transformation with plane-polar scanning, requiring a minimum number of NF data and adopting an oblate ellipsoid to model the antenna under test, is proposed. It makes use of an iterative scheme to recover the probe voltage samples at the points fixed by the nonredundant sampling representation from the collected irregularly spaced ones. The NF data needed by the classical NF-FF transformation with plane-rectangular scan are then efficiently evaluated via a two-dimensional optimal sampling interpolation formula. Experimental tests, performed at the UNISA Antenna Characterization Lab and assessing its effectiveness, are reported.