Clutter suppression for thinned array with phase only nulling
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United States of America Patent
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May 7, 1996
Grant Date -
N/A
app pub date -
May 11, 1995
filing date -
May 11, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An active array antenna for use, for example, in a radar system, includes elemental antennas, each with a T/R module, distributed over a circular aperture. For lowest cost, the aperture is thinned. The T/R modules are operated at maximum output, to achieve maximum DC-to-RF efficiency, and for simplicity. A phase controller controls the phase shift which is imparted by each module to its signal, to form a main beam and its associated sidelobes. A perturbation phase generator portion of a phase controller adds a perturbation phase shift selected, in conjunction with a particular thinning distribution, to form a relatively wide null in the sidelobe structure, in which signal transduction is reduced. In a radar context, this null may be placed on a source of ground clutter or a jammer.
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