Holographic measurements of the Effelsberg 100-m radiotelescope via phase retrieval

Holographic measurements of the Effelsberg 100-m radiotelescope have been made using the beacons of the geostationary satellites ITALSAT F1 and F2 as well as EUTELSAT at 18.685 GHz and 11.698 GHz, respectively. From two antenna pattern measurements with a high dynamic range at different focus settings the surface error distribution, which is proportional to the phase distribution of the surface current, are found by the iterative Misell algorithmn. The aim of the measurements is the adjustment of the recently exchanged 692 outer wire mesh panels by perforated aluminium panels to increase the aperture efficiency of the 100-m telescope at high frequencies. (orig.)SIGLEAvailable from TIB Hannover: RN 4260(79) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman