Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Jonathan Landon"'
Publikováno v:
WiOpt
Environmental factors that lead to the movement and type of obstacles in and around wireless links are well-known to directly affect channel characteristics. However, while mobile users typically have repeatable daily or weekly patterns with common l
Publikováno v:
IEEE Transactions on Signal Processing. 60:1215-1228
This paper considers the problem of adaptive array processing for interference canceling to drive very deep nulls in difficult signal environments. In many practical scenarios, the achievable null depth is limited by covariance matrix estimation erro
Autor:
J. R. Fisher, Jonathan Landon, David Jones, Brian D. Jeffs, Roger D. Norrod, Jacob Waldron, Karl F. Warnick
Publikováno v:
IEEE Journal of Selected Topics in Signal Processing. 2:635-646
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-te
Autor:
Dinesh Rajan, Onur Altintas, Jialin He, Jonathan Landon, Rama Vuyyuru, Pengfei Cui, Hui Liu, Joseph Camp
Publikováno v:
INFOCOM
Context awareness has received increasing attention with the proliferation of various types of sensors on mobile devices. However, while wireless performance is known to be highly correlated with environmental settings, mobile devices have yet to ful
Autor:
David Carter, Vikas Asthana, J. Richard Fisher, Karl F. Warnick, Brian D. Jeffs, D. Anish Roshi, Roger D. Norrod, Taylor D. Webb, Michael Elmer, Jonathan Landon
Publikováno v:
2011 XXXth URSI General Assembly and Scientific Symposium.
Efforts have been underway for the last several years to develop phased array feed antennas for large reflectors such as the Green Bank Telescope (GBT) as well as mid-size reflectors for Square Kilometer Array demonstration instruments. We report on
Autor:
J. Richard Fisher, Michael Elmer, Jonathan Landon, Alan Stemmons, Karl F. Warnick, Jacob Waldron, David Jones, Brian D. Jeffs, Roger D. Norrod
Phased array feeds (PAFs) for reflector antennas offer the potential for increased reflector field of view and faster survey speeds. To address some of the development challenges that remain for scientifically useful PAFs, including calibration and b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5493150edfaf6ca778c6ca51e1e70810
http://arxiv.org/abs/0912.0204
http://arxiv.org/abs/0912.0204
Autor:
Karl F. Warnick, J. Richard Fisher, David Jones, Jacob Waldron, Brian D. Jeffs, Roger D. Norrod, Jonathan Landon
Publikováno v:
2009 IEEE International Workshop on Antenna Technology.
Instrumentation for radio astronomical observations is currently undergoing a transition from large reflectors with single-pixel feeds to multi-pixel phased arrays. Research efforts aimed at realizing the benefits of phased arrays for highly sensitiv
Autor:
David Jones, Jonathan Landon, Brian D. Jeffs, Jacob Waldron, Karl F. Warnick, Roger D. Norrod, J. Richard Fisher
Publikováno v:
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting.
An experimental 19-element L-band phased array feed was installed on the Green Bank 20-Meter Telescope in October 2007 and July 2008 to measure sensitivity and effciency and demonstrate signal processing algorithms for array calibration, multiple bea
Autor:
Jonathan Landon, Richard F. Bradley, J. R. Fisher, Jacob Waldron, Karl F. Warnick, Brian D. Jeffs, M. Lilrose
Publikováno v:
2nd European Conference on Antennas and Propagation (EuCAP 2007).
This paper presents experimental results for adaptive spatial filtering of radio frequency interference (RFI) using a 19 element, L-band focal plane array feed on a small (3 meter) reflector. Successful cancellation was observed for simulated station