Daily Image
17-02-2014
PhD thesis defence of Gregory Hellbourg (Orleans)
| Submitter: | Albert-Jan Boonstra |
| Description: | On Friday, January 31st, Greg defended his PhD thesis entitled "Radio Frequency Interference spatial processing for modern radio telescopes" at the University of Orleans (France). This PhD was a partnership between ASTRON and the CNRS, and co-funded by ASTRON, CNRS and the Conseil General de la Region Centre. The committee was composed of Dr. Albert-Jan Boonstra (ASTRON), Prof. Amir Leshem (Bar-Ilan University), Prof. Asoke Nandi (Brunel University), Prof. Karim Abed-Meraim (University of Orleans), Prof. Gilles Theureau (Nancay observatory), Prof. Rachid Harba (University of Orleans), Dr. David Valls-Gabaud (Paris-Meudon observatory) and Dr. Rodolphe Weber (University of Orleans). After introducing Radio Frequency Interference (RFI) issues in radio astronomy, Greg presented three spatial processing techniques: interference subspace subtraction (see pictures), and the orthogonal and the oblique projection. A third section addressed the problem of interference subspace estimation. He showed the latest results obtained with the French EMBRACE station at the Nancay observatory after implementing an oblique-projection-based RFI mitigation algorithm. All techniques were illustrated with simulations, and with LOFAR LBA and HBA data, acquired with Dutch LOFAR stations. The pictures show Greg during his defense, and also a result of subspace-based interference mitigation. A copy of the thesis will be available at ASTRON in the coming weeks. Greg would like to thank all his friends at ASTRON for the help and the good times they gave him during the years of his stay. His next destination is Sydney, Australia, where he will work with Dr. Aaron Chippendale and Prof. Brian Jeffs on RFI mitigation with phased array feeds. |
| Copyright: | ASTRON / CNRS |
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