REGRESSION METHOD FOR FILTERING OF THE SPATIAL SIGNAL AT THE ANECHOIC CHAMBER MEASUREMENTS

Reduction of influence of parasitic reflections and vari-ous interfering factors is one of the most important prob-lems in the antenna measurement theory and technique. In this paper a method of measurement of the near-omnidirectional antenna gain factor (GF), based on the measurement of the power transfer factor (PTF) depend-ing on distance between transmitting and receiving an-tenna is considered. It is assumed that the measurements are produced in an anechoic chamber (or an antenna test range) at presence of the parasitic reflections as well as at limited sizes of antennas and small distance between them. A regression filtering method for a spatial signal distorted by interference of direct and reflected waves is offered. An approach is developed to get dependence of GF on a distance between antennas in the free space and, hence, the correct value of GF in the far zone, taking into account uncertainty of some geometrical parame-ters. 1