Contour plot (dB scale, 0 at maximum amplitude) of the interferometric imaging in one sub-band and after a phase-only calibration (top panel), and a full redundancy-based calibration (bottom panel), for a GPS satellite observation with EMBRACE@Nançay. Observed data are shown as dashed contours, while the best-fit rectangle aperture model is shown as continuous ones. The periodization of the main pattern is due to sampling of the UV plane, here the equivalent of 3 fields of view is shown.