Beamforming Techniques and Interference Mitigation Using a Multiple Feed Array for Radio ...

101 Pages·2016·1.32 MB·English

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Theses and Dissertations
2004-03-03
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Chad K. Hansen
Brigham Young University - Provo
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Hansen, Chad K., "Beamforming Techniques and Interference Mitigation Using a Multiple Feed Array for
Radio Astronomy" (2004). Theses and Dissertations. 216.
https://scholarsarchive.byu.edu/etd/216
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BEAMFORMING TECHNIQUES AND INTERFERENCE
MITIGATION USING A MULTIPLE FEED ARRAY FOR RADIO
ASTRONOMY
by
Chad K. Hansen
A thesis submitted to the faculty of
Brigham Young University
in partial fulfillment of the requirements for the degree of
Master of Science
Department of Electrical and Computer Engineering
Brigham Young University
April 2004

Copyright (cid:176)c 2004 Chad K. Hansen
All Rights Reserved

ABSTRACT
BEAMFORMING TECHNIQUES AND INTERFERENCE MITIGATION USING
A MULTIPLE FEED ARRAY FOR RADIO ASTRONOMY
Chad K. Hansen
Department of Electrical and Computer Engineering
Master of Science
Radiofrequencyinterferencehasbecomealargeproblemtoradioastronomers.
This thesis proposes the idea that radio frequency interference can be mitigated using
a phased array feed in conjunction with a large reflector. A phased array feed would
allow radio astronomers to observe fainter signals than is currently possible, while
at the same time enabling rapid sky surveys. A phased array feed was designed
and simulated, and sensitivity optimization was performed on the array feed. It was
shown that higher sensitivity can be achieved using a 7-element phased array feed
than with a conventional waveguide feed. Simulations were ran using RFI mitigation
algorithms on the array to show that interference cancellation can, in principle, be
performed using a phased array feed. In addition to these simulations, improvements
were made to a previously designed RF receiver so that radio astronomy observations
could be made and interference mitigation algorithms tested on a receiver platform.