Post by plutronus on Mar 9, 2013 2:07:53 GMT -6
The Varying Spread Spectrum (Doppler) Effect for Radio Interferometric Imaging
Data image reconstruction technique for the Chilean NRAS Long Base Interferometry Radio Telescope Antenna Array (related to subject of the previously posted article by SwampRat)
Full Text PDF: infoscience.epfl.ch/record/183884/files/wolzBASP2013.pdf
Abstract Follows:
From: infoscience.epfl.ch/record/183884?ln=en
Paper By:
Wolz, Laura; Abdalla, Filipe; Carrillo, Rafael; Wiaux, Yves; McEwen, Jason
Presented at: International Biomedical and Astronomical Signal Processing (BASP) Frontiers workshop, Villars-sur-Ollon, Switzerland, January, 2013
Publication date: 2013
We study the impact of the spread spectrum effect in radio interferometry on the quality of image reconstruction. This spread spectrum effect will be induced by the wide-field-of-view of forthcoming radio interferometric telescopes. The resulting chirp modulation improves the quality of reconstructed interferometric images by increasing the incoherence of the measurement and sparsity dictionaries. We extend previous studies of this effect to consider the more realistic setting where the chirp modulation varies for each visibility measurement made by the telescope. In these first preliminary results, we show that for this setting the quality of reconstruction improves significantly over the case without chirp modulation and achieves almost the reconstruction quality of the case of maximal, constant chirp modulation.
Keywords: Radio interferometry ; Compressed sensing ; Spread spectrum ; CIBM-SPC ; LTS2 ; LTS5
Reference
EPFL-CONF-183884
URL: baspfrontiers.epfl.ch/proceedings.php
PDF full text: infoscience.epfl.ch/record/183884/files/wolzBASP2013.pdf
Data image reconstruction technique for the Chilean NRAS Long Base Interferometry Radio Telescope Antenna Array (related to subject of the previously posted article by SwampRat)
Full Text PDF: infoscience.epfl.ch/record/183884/files/wolzBASP2013.pdf
Abstract Follows:
From: infoscience.epfl.ch/record/183884?ln=en
Paper By:
Wolz, Laura; Abdalla, Filipe; Carrillo, Rafael; Wiaux, Yves; McEwen, Jason
Presented at: International Biomedical and Astronomical Signal Processing (BASP) Frontiers workshop, Villars-sur-Ollon, Switzerland, January, 2013
Publication date: 2013
We study the impact of the spread spectrum effect in radio interferometry on the quality of image reconstruction. This spread spectrum effect will be induced by the wide-field-of-view of forthcoming radio interferometric telescopes. The resulting chirp modulation improves the quality of reconstructed interferometric images by increasing the incoherence of the measurement and sparsity dictionaries. We extend previous studies of this effect to consider the more realistic setting where the chirp modulation varies for each visibility measurement made by the telescope. In these first preliminary results, we show that for this setting the quality of reconstruction improves significantly over the case without chirp modulation and achieves almost the reconstruction quality of the case of maximal, constant chirp modulation.
Keywords: Radio interferometry ; Compressed sensing ; Spread spectrum ; CIBM-SPC ; LTS2 ; LTS5
Reference
EPFL-CONF-183884
URL: baspfrontiers.epfl.ch/proceedings.php
PDF full text: infoscience.epfl.ch/record/183884/files/wolzBASP2013.pdf