Analysis of the RATAN-600 radiotelescope antenna with a multilevel Physical Optics algorithm

Abstract 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.

[1]  Amir Boag,et al.  Fast radiation pattern evaluation for lens and reflector antennas , 2003 .

[2]  A. Boag,et al.  Optical and diffraction simulation techniques for large multibeam reflector , 2010, 2010 INTERNATIONAL KHARKOV SYMPOSIUM ON PHYSICS AND ENGINEERING OF MICROWAVES, MILLIMETER AND SUBMILLIMETER WAVES.

[3]  G. Franceschetti,et al.  On the spatial bandwidth of scattered fields , 1987 .

[4]  Y.N. Parijskij RATAN-600: the World's biggest reflector at the 'cross roads' , 1993, IEEE Antennas and Propagation Magazine.

[5]  L. V. Opeikina,et al.  Computation of the polarization characteristics of RATAN-600 in the “Southern sector with a flat reflector” mode with the diffraction effects considered , 2011 .

[6]  A. Boag,et al.  Analysis of Very Large Dual-Reflector Antennas Using Multilevel Physical Optics (MLPO) Algorithm , 2007, 2007 International Conference on Electromagnetics in Advanced Applications.

[7]  O. Bucci,et al.  Representation of electromagnetic fields over arbitrary surfaces by a finite and nonredundant number of samples , 1998 .

[8]  Christian Parrot,et al.  Scaling of the Multilevel Physical Optics parallel algorithm on a large grid , 2010, EuCAP 2010.

[9]  A. Boag,et al.  Generalized Multilevel Physical Optics (MLPO) for Comprehensive Analysis of Reflector Antennas , 2012, IEEE Transactions on Antennas and Propagation.

[10]  E. K. Majorova,et al.  Computation of the RATAN-600 radio telescope power beam pattern with allowance for diffraction effects in the southern-sector-with-flat-reflector mode , 2011 .

[11]  A. Boag,et al.  Multilevel fast physical optics algorithm for radiation from non-planar apertures , 2005, IEEE Transactions on Antennas and Propagation.