Quasi-real-time antenna near-field/far-field transformation without phase and amplitude recording

A means of obtaining phase and amplitude information through amplitude only recording is suggested and applied to a near-field/far-field transformation technique which already offers advantages over other approaches. The in-phase and quadrature components of the data are obtained by simple subtraction and therefore no special functions are required. It is demonstrated that care must be exercised in the choice of the reference level and quantization resolution and that calibration of the increment phase shift is important. Experimental results are presented which demonstrate the feasibility of quasi-real-time prediction based on the proposed approach.