Antennas and methods to provide adaptable omnidirectional ground nulls
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United States of America Patent
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Jul 23, 2013
Grant Date -
Mar 17, 2011
app pub date -
Mar 4, 2010
filing date -
Mar 16, 2009
priority date (Note) -
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Abstract
GPS reception on helicopters and ground vehicles may be subject to varying near-ground interference. A compact antenna includes vertically spaced arrays of radiating elements. The first array provides a basic reception pattern. The second array provides a pattern having a distinctive low elevation angle phase reversal. By combining signals for these patterns an antenna pattern with a low angle onmidirectional elevation null characteristic is provided to suppress near-ground interference. Prior to combining, signals from the second array may be modified in amplitude or phase, or both, on a semi-permanent basis, or may be adaptively modified on an active basis, in order to adjust the null characteristic. Antennas and methods are described.
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