Method and apparatus to determine the direction to a transponder in a modulated backscatter communication system
AssigneeTC (Bermuda) License, Ltd.
InventorJeremy A. Landt
Life of this patent
Estimating the term…
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.
Claims13
A method for determining the direction to a transponder comprising:
- transmitting a first signal to an area where communications with a transponder is desired;
- producing a second signal derived from the first signal;
- receiving the second signal via first, second, and third antennas;
- forming a difference signal from the second signal received via the first and second antennas;
- delaying the difference signal;
- and
- comparing a first polarity of the delayed difference signal with a second polarity of the second signal received via the third antenna.
A method for determining the direction to a transponder comprising:
- 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 receive 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.
A system for determining the direction to a transponder comprising:
- a first antenna for transmitting a first signal to the transponder;
- second and third antennas for receiving a second signal from the transponder;
- means for adding the second signal received by the second antenna with the second signal received by the third antenna to produce a sum signal;
- means for subtracting the second signal received by the second antenna from the second signal received by the third antenna to produce a difference signal;
- means for delaying the difference signal;
- and
- a comparator for comparing a first polarity of the difference signal with a second polarity of the sum signal.
A system for determining the direction to a transponder comprising:
- a first and a second antenna for receiving a signal from the transponder;
- means for adding the signal received by the first antenna with the signal received by the second antenna to produce a sum signal;
- means for subtracting the signal received by the first antenna from the signal received by the second antenna to produce a difference signal;
- and
- a processor for comparing the difference signal with the sum signal to determine the direction to the transponder.
Dependencies are inferred from the claim text.