Antennas providing near-spherical coverage with right-hand circular polarization for differential GPS use
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United States of America Patent
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Jul 19, 2011
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N/A
app pub date -
Jun 30, 2009
filing date -
Jun 30, 2009
priority date (Note) -
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Abstract
Accuracy of derivation of local corrections to GPS signals for use for aircraft landing guidance is subject to effects of reflected multipath signals. Antennas with a near-spherical antenna pattern of right-hand circular polarization, except within a downward cone, provide suppression of reflected multipath GPS signals incident from all azimuth angles and all relevant elevation angles. For such an antenna a cylindrical top assembly may include spaced conductive disks with intermediate exciter members excited at increments of 90 degree phase and surrounded by a dielectric ring. A cylindrical base assembly may include signal absorbent top and side wall portions and a bottom conductive disk and may alternatively include a signal absorbent inner wall portion.
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