Measurement configuration. (a) Complete measurement configuration depicting the transmitter points with solid, black points and the receiver positions in gray circles. (b) Signal path for the centermost transmitter-receiver pair showing a cut-in view through the target. The view is along the z-axis. The source is at the position ϕ_s = 90°, θ_s = 174° and the receiver at ϕ_r = 90°, θ_r = 186°. (c) Experimental configuration with the angles definition. (d) Photograph of the analog object and the transmitter-receiver pair in the anechoic chamber of the CCRM in Marseille. The transmitter-receiver pair is seen in the background and the 3D-printed support plate applied for positioning is visible under the analog model.