A design study of antenna modulation techniques resulting in reduced sidelobe levels
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Authors
Leane, Stephen Patrick
Subjects
Advisors
Cooper, Paul E.
Date of Issue
1966-12
Date
Publisher
Monterey, California. U.S. Naval Postgraduate School
Language
en_US
Abstract
It is desirable, for many applications, to utilize a receiving
antenna system which is sensitive only to radiation from a specific
direction. In order to eliminate the incoming signals from all other
directions, the sidelobe strength in these regions must be significantly
lower than the main beam. Time modulation was applied to certain of
the antenna's parameters in an effort to reduce the sidelobe level of
a linear receiving antenna array. Such factors as the effective length
of the array, and the frequency and phase of the signals received by
each of the individual elements were periodically varied in time. After
summing the voltage contribution from each element, the resultant signal
was suitably filtered and sent to the detector. Antenna field patterns
were developed in mathematical terms and the experimental calculations
were made on the CDC 1604 computer. For all forms of modulation investigated,
it was possible to reduce the sidelobe strength by more than an
order of magnitude below the unmodulated level.
Type
Thesis
Description
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.