Directional beacon
First Claim
1. A beacon for generating location determination signals, the beacon comprising:
- a housing;
a plurality of directional radio frequency antennas attached to the housing such that each directional radio frequency antenna points out radially from an axis of the housing, wherein each directional radio frequency antenna points in a different direction than the other directional radio frequency antennas, and wherein each of the plurality of directional radio frequency antennas is associated with a respective unique identifier;
a signal source producing a signal output;
a multiplexer electrically connected to each of the plurality of directional radio frequency antennas and to the signal source, the multiplexer configured to sequentially conduct the signal output from the signal source to each one of the plurality of directional radio frequency antennas to sequentially transmit a first wireless signal from the plurality of directional radio frequency antennas, wherein the first wireless signal includes the unique identifier associated with the directional radio frequency antenna from which it was transmitted for determining an angle relative to the beacon; and
a transmitter for transmitting a second wireless signal for determining a range from the beacon based on a time of flight of the second wireless signal.
6 Assignments
0 Petitions
Accused Products
Abstract
A beacon includes a housing, multiple directional radio frequency antennas, a multiplexer, and a signal source that produces a signal output. The directional radio frequency antennas are attached to the housing such that each directional radio frequency antenna points out radially from an axis of the housing in a direction different than the other directional radio frequency antennas. The multiplexer is electrically connected to each of the directional radio frequency antennas and to the signal source. The multiplexer is configured to sequentially conduct the radio signal output from the signal source to each of the directional radio frequency antennas to produce a wireless signal, wherein the signal output is only conducted to one of the directional radio frequency antennas at any given time and includes a unique identifier identifying the antenna it is currently being transmitted from. The beacon may also include electrical hardware for performing time of flight measurements.
13 Citations
20 Claims
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1. A beacon for generating location determination signals, the beacon comprising:
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a housing; a plurality of directional radio frequency antennas attached to the housing such that each directional radio frequency antenna points out radially from an axis of the housing, wherein each directional radio frequency antenna points in a different direction than the other directional radio frequency antennas, and wherein each of the plurality of directional radio frequency antennas is associated with a respective unique identifier; a signal source producing a signal output; a multiplexer electrically connected to each of the plurality of directional radio frequency antennas and to the signal source, the multiplexer configured to sequentially conduct the signal output from the signal source to each one of the plurality of directional radio frequency antennas to sequentially transmit a first wireless signal from the plurality of directional radio frequency antennas, wherein the first wireless signal includes the unique identifier associated with the directional radio frequency antenna from which it was transmitted for determining an angle relative to the beacon; and a transmitter for transmitting a second wireless signal for determining a range from the beacon based on a time of flight of the second wireless signal. - View Dependent Claims (2, 3, 4, 10, 11, 12, 13)
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5. A method of determining a position of a portable electronic device with respect to a beacon sequentially transmitting a wireless signal from four or more directional antennas wherein the wireless signal is varied to include a unique identifier identifying the one of the four or more directional antennas from which it is transmitted at the time, the method comprising:
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receiving, at the portable electronic device, the wireless signal; measuring, at the portable electronic device, a signal strength of the received wireless signal; demodulating, at the portable electronic device, the wireless signal to recover the unique identifier and associating the unique identifier with the measured signal strength; repeating the receiving, measuring, demodulating, and associating to determine a signal strength for each of the four or more directional antennas; and determining a location of the portable electronic device relative to the beacon based on the signal strengths for each of the four or more directional antennas. - View Dependent Claims (6, 7, 8, 9)
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14. An apparatus for generating signals used to determine a location of an object relative to the apparatus, the apparatus comprising:
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four or more directional antennas each having a pointing direction, the four or more antennas attached to a structure and spaced equidistantly about an axis of the structure such that the pointing directions of the directional antennas point out from the structure substantially in a plane and such that an angular spacing between the pointing directions of any adjacent two of the directional antennas is about the same as an angular spacing between the pointing directions of any other adjacent two of the directional antennas; and a first signal source configured to sequentially transmit a radio signal from the four or more directional antennas, wherein the radio signal is transmitted from only one of the four or more directional antennas at a time and wherein each of the four or more directional antennas has a unique identifier, the radio signal being modulated to include the unique identifier associated with the antenna from which it is being transmitted at the time for determining an angle of the object relative to the apparatus; and a second signal source configured to transmit a time of flight signal from the apparatus, the time of flight signal for determining a distance of the object from the apparatus. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification