Comptes Rendus
The next generation radiotelescopes / Les radiotélescopes du futur
Analysis of the RATAN-600 radiotelescope antenna with a multilevel Physical Optics algorithm
[Analyse de lʼantenne du radiotélescope RATAN-600 par une méthode dʼOptique Physique multi-niveaux]
Comptes Rendus. Physique, Volume 13 (2012) no. 1, pp. 38-45.

Lʼantenne du radiotélescope RATAN-600 est un système flexible composé de plusieurs réflecteurs, dont certains de très grandes dimensions. Dans sa configuration la plus performante pour le domaine millimétrique, elle est dotée dʼun réseau focal. Un tel système constitue un défi du point de vue de lʼanalyse électromagnétique, si lʼon souhaite disposer de résultats précis sur son diagramme dans lʼespace en 3D. Une méthode dʼOptique Physique rapide basée sur une décomposition multi-niveaux des surfaces dʼintégration, permettant de rendre la complexité des calculs dʼintégrales comparable à celle de transformées de Fourier rapides, est proposée pour répondre à ce besoin. Lʼalgorithme de la méthode est présenté, ainsi que son application au cas du RATAN-600 et des résultats numériques.

The RATAN-600 antenna is a flexible multireflector system composed of reflectors of very large dimensions. An extended system, with improved performance in the millimetric range, includes a focal receiver array. Accurate electromagnetic analysis of such a system, and simulation of three-dimensional (3D) patterns, represents a substantial computational challenge. A fast Physical Optics method based on a multilevel subdivision of the surfaces of integration is proposed to address this problem. This method allows to perform Physical Optics integrals with a computational complexity comparable to that of the Fast Fourier Transform. The algorithm and initial numerical results of its application to the RATAN-600 antenna system are presented.

Publié le :
DOI : 10.1016/j.crhy.2011.10.011
Keywords: Radiotelescope, Multireflector antenna, Physical Optics, Multilevel algorithm
Mot clés : Radiotélescope, Antenne multiréflecteurs, Optique Physique, Algorithme multi-niveaux

Christine Letrou 1 ; Vladimir Khaikin 2 ; Amir Boag 3

1 TELECOM SudParis, Lab. SAMOVAR (UMR CNRS 5157), 91011 Evry cedex, France
2 The Special Astrophysical Observatory, RAS, Russia
3 School of Electrical Engineering, Tel-Aviv University, Tel-Aviv, Israel
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Christine Letrou; Vladimir Khaikin; Amir Boag. Analysis of the RATAN-600 radiotelescope antenna with a multilevel Physical Optics algorithm. Comptes Rendus. Physique, Volume 13 (2012) no. 1, pp. 38-45. doi : 10.1016/j.crhy.2011.10.011. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2011.10.011/

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