Method and apparatus to determine the direction to a transponder in a modulated backscatter communication system
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United States of America Patent
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Jul 29, 2003
Grant Date -
Mar 27, 2003
app pub date -
Oct 18, 2002
filing date -
Jun 5, 2000
priority date (Note) -
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Abstract
Methods and systems for determining the direction to a transponder are disclosed. The methods and systems include transmitting a first signal to an area where communications with a transponder is desired; producing a second signal desired from the first signal; receiving the second signal via a first and second antenna forming a difference signal from the second signal received via the first and second antennas; forming a third signal by adding the second signal received via the first antenna and the second signal received via the third antenna; delaying the difference signal; and comparing a fist polarity of the delayed difference signal with a second polarity of the third signal.
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