Computer Science – Performance
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008istsp...2..635j&link_type=abstract
IEEE Journal of Selected Topics in Signal Processing, vol. 2, issue 5, pp. 635-646
Computer Science
Performance
3
Scientific paper
Relative to traditional waveguide feeds, phased array feeds (PAFs) for radio telescopes can increase the instrument field of view and sky survey speed. Unique challenges associated with PAF observations, including extremely low signal levels, long-term system gain stability requirements, spatially correlated noise due to mutual coupling, and tight beamshape tolerances, require the development of new array signal processing techniques for this application. We propose a calibration and beamforming strategy for PAFs including interference mitigation with power spectral density (PSD) estimation bias correction. Key efficiency metrics for single-feed instruments are extended to the array case and used to verify performance of the algorithms. These techniques are validated using numerical simulations and experimental data from a 19-element PAF on the Green Bank 20-m telescope.
Fisher Richard J.
Jeffs Brian D.
Jones David
Landon Jonathan
Norrod Roger D.
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