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Proceedings Paper

DSS-28: a novel wide bandwidth radio telescope devoted to educational outreach
Author(s): Glenn Jones; Sander Weinreb; Hamdi Mani; Stephen Smith; Lawrence Teitelbaum; Mark Hofstadter; Thomas B. H. Kuiper; William A. Imbriale; Ryan Dorcey; John Leflang
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Paper Abstract

We have recently equipped the 34-meter DSS-28 radio telescope at the Goldstone Deep Space Communications Complex with a novel wide bandwidth radiometer and digital signal processor as part of the Goldstone Apple Valley Radio Telescope (GAVRT) educational outreach program operated by the Jet Propulsion Laboratory and the Lewis Center for Educational Research. The system employs a cryogenically cooled wide bandwidth quad-ridge feed and InP low noise amplifiers to achieve excellent noise performance from 2.7 to 14 GHz; a fractional bandwidth better than 4:1. Four independently tunable dual-polarization receivers each down-convert a 2 GHz block to baseband, providing access to 8 GHz of instantaneous bandwidth. A flexible FPGA-based signal processor has been constructed using CASPER FPGA hardware and tools to take advantage of this enormous bandwidth. This system demonstrates many of the enabling wide bandwidth technologies that will be crucial to maximizing the utility of future large centimeter-wavelength arrays, in particular the Square Kilometer Array. The GAVRT program has previously used narrow bandwidth total power radiometers to study flux variability of quasars and the outer planets. The versatility of DSS-28 will enable other projects including spectroscopy and SETI. Finally, the wide instantaneous bandwidth available makes this system uniquely suited for studying transient radio pulses. A configuration of the digital signal processor has been developed which provides the capability of recording a burst of raw baseband voltage data triggered by a real-time incoherent dedispersion system which is very sensitive to pulses from a known source, such as the Crab Nebula pulsar.

Paper Details

Date Published: 4 August 2010
PDF: 12 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77333O (4 August 2010); doi: 10.1117/12.856642
Show Author Affiliations
Glenn Jones, National Radio Astronomy Observatory (United States)
California Institute of Technology (United States)
Sander Weinreb, California Institute of Technology (United States)
Jet Propulsion Lab. (United States)
Hamdi Mani, California Institute of Technology (United States)
Stephen Smith, California Institute of Technology (United States)
Lawrence Teitelbaum, Jet Propulsion Lab. (United States)
Mark Hofstadter, Jet Propulsion Lab. (United States)
Thomas B. H. Kuiper, Jet Propulsion Lab. (United States)
William A. Imbriale, Jet Propulsion Lab. (United States)
Ryan Dorcey, Lewis Ctr. for Educational Research (United States)
John Leflang, Lewis Ctr. for Educational Research (United States)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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