By Topic

A broadband 512-element full correlation imaging array at VHF (LEDA)

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
L. J. Greenhili ; Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138 USA ; D. Werthimer ; G. B. Taylor ; S. W. Ellingson

The Large Aperture Experiment to Detect the Dark Ages (LEDA) seeks to detect hyperfine line emission from neutral Hydrogen (λrest ~ 21 cm; λobs = 4-6 m) in the intergalactic medium ~ 108 yr after the Big Bang. This is an era for which there are no data with which to directly constrain theory. LEDA is funded to deploy to station one of the Long Wavelength Array (i) a real-time, O(10-100) TFlops-1, 512-input cross-correlator to enable full-sky full-Stokes imaging over 30-88 MHz, and (ii) dipole antennas for Dicke-switched total-power radiometry by which to detect the Hydrogen line. Project goals are discovery and development of new techniques and instrumentation. Key technical elements of LEDA include “large-N” cross correlation, nearly horizon to horizon broadband imaging, calibration of total-power radiometry using interferometric techniques, correction for direction-dependent receptor gains (e.g., due to mutual coupling), and correction for direction-dependent perturbation of incident wave fronts by the ionosphere.

Published in:

Electromagnetics in Advanced Applications (ICEAA), 2012 International Conference on

Date of Conference:

2-7 Sept. 2012