A Microwave Holographic Procedure for Large Symmetric Reflector Antennas Using a Fresnel-Zone Field Data Processing

Abstract

In this paper we propose a new holographic procedure for the diagnostic of large reflector antennas, based on the direct use of the Fresnel-field pattern. The relation leading from the Fresnel field to the current on the reflector surface is formulated in the least-squares sense as a discrete data inverse problem and then regularized by using a singular value decomposition approach. A detailed theoretical analysis of the problem and full assessment of the presented technique are provided. Simulations are carried out by using the radiative near-field pattern generated with a commercial software. Results show good accuracy and robustness to noise for the retrieval of the panel-to-panel misalignment of a reflector antenna.

Research on the panel adjustment method of an active main reflector for a large radio telescope

“…However, the actual situation of the antenna panel is not the case. Due to factors such as the installation accuracy of the antenna panel and the gravity deformation of the support structure, the antenna panel is no longer a completely standard paraboloid, which will cause the phases on the aperture field plane to be not equal (Mazzarella et al 2012). Thus, we can establish the relationship between the displacement of the actual paraboloid deviating from the standard paraboloid position and the phase difference on the aperture field plane.…”