Method of and apparatus for automatically calibrating a phased-array antenna
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United States of America Patent
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Feb 16, 1993
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N/A
app pub date -
Apr 12, 1991
filing date -
Apr 14, 1990
priority date (Note) -
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Abstract
Landing aids using phased-array antennas must be very carefully calibrated. Conventional methods use probes which are inserted into each individual radiating element of the array antenna. For 6-bit phase shifters, this method is not suficiently accurate. A method and an apparatus are disclosed wherein the aperture illumination of the array antenna is determined from the output of an integral waveguide and compared with a desired aperture illumination. The difference between actual value and desired value is compensated for iteratively with the aid of an adaptive control system.
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