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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/25956
Title: Efficient diagnosis of radiotelescopes misalignments
Authors: Capozzoli, A.
Liseno, A.
Curcio, C.
SAVARESE, Salvatore 
SCHIPANI, Pietro 
Issue Date: 2016
Volume: Antenna Measurement Techniques Association Symposium (AMTA) 2016 Proceedings
First Page: 1-5
Abstract: An innovative method for the diagnosis of large reflector antennas from far field data in radio astronomical application is presented, which is based on the optimization of the number and the location of the far field sampling points required to retrieve the antenna status in terms of feed misalignments. In these applications a continuous monitoring of the Antenna Under Test (AUT), and its subsequent reassessment, is necessary to guarantee the optimal performances of the radiotelescope. The goal of the method is to reduce the measurement time length to minimize the effects of the time variations of both the measurement setup and of the environmental conditions, as well as the issues raised by the complex tracking of the source determined by a prolonged acquisition process. Furthermore, a short measurement process helps to shorten the idle time forced by the maintenance activity. The field radiated by the AUT is described by the aperture field method. The effects of the feed misalignments are modeled in terms of an aberration function, and the relationship between this function and the Far Field Pattern is recast in the linear map by expanding on a proper set of basis functions the perturbation function of the Aperture Field. These basis functions are determined using the Principal Component Analysis. Accordingly, from the Far Field Pattern, assumed measured in amplitude and phase, the unknown parameters defining the antenna status can be retrieved. The number and the position of the samples is then found by a Singular Values Optimization (SVO).
Conference Name: Antenna Measurement Techniques Association Symposium (AMTA) 2016 Proceedings
Conference Place: Austin, TX, USA
Conference Date: 30 October-3 November, 2016
URI: http://hdl.handle.net/20.500.12386/25956
URL: https://ieeexplore.ieee.org/document/7806287
ISBN: 978-1-5090-5179-3
DOI: 10.1109/AMTAP.2016.7806287
Bibcode ADS: 2016amta.confE...1C
Fulltext: mixedopen
Appears in Collections:3.01 Contributi in Atti di convegno

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