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Distance measurements using a single wireless reader

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Distance measurements using a single wireless reader


A method, comprising: generating or receiving information about multiple distance measurements of distances between the wireless tag and the wireless reader at different points of time; wherein the wireless reader is positioned at different locations in relation to the wireless reader at the different points of time; generating or receiving information about a spatial relationship between the different locations or receiving information indicative of the spatial; and determining the location of the wireless tag in response to the multiple range measurements and the spatial relationship between the different locations.
Related Terms: Wireless Wireless Tag

USPTO Applicaton #: #20140145881 - Class: 342386 (USPTO) -


Inventors: Amir Bassan-eskenazi, Naftaly Sharir, Ofer Friedman, Giora Sussman

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The Patent Description & Claims data below is from USPTO Patent Application 20140145881, Distance measurements using a single wireless reader.

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RELATED APPLICATIONS

This application claims priority from U.S. provisional patent Ser. No. 61/729,601 filing date Nov. 25, 2012, U.S. provisional patent Ser. No. 61/803,534 filing date Mar. 20, 2013, U.S. provisional patent Ser. No. 61/832,872 filing date Jun. 9, 2013, and U.S. provisional patent Ser. No. 61/868,591 filing date Aug. 22, 2013, all being incorporated herein by reference in their entirety.

FIELD OF THE INVENTION

The invention relates to wireless communication.

BACKGROUND OF THE INVENTION

There is a growing need to track users, user devices, monitor items and find locations within indoor spaces in an efficient manner. Especially there is a growing need to locate a user that uses a single wireless reader.

SUMMARY

OF THE INVENTION

According to various embodiments of the invention there are provided various methods, systems, wireless tags, wireless readers, and non-transitory computerized media.

According to an embodiment of the invention there may be provided a method that may include receiving during a wideband reception period and by a wideband reception circuit of a first wireless transceiver a wideband ranging message; transmitting during a wideband transmission period and by a wideband transmission circuit of the first wireless transceiver a wideband ranging response message; receiving by a narrowband reception circuit of the first wireless transceiver received narrowband messages; and transmitting by a narrowband transmission circuit of the first wireless transceiver transmitted narrowband messages

The method may include receiving a received narrowband message that may include an indication about a future transmission of the wideband ranging message; and causing the wideband reception circuit to search for the wideband ranging message within the wideband reception period that is defined in response to the indication.

The method may include closing the wideband reception circuit outside the wideband reception period.

The method may include starting wideband reception period after a predetermined delay period lapsed from the receiving of the received narrowband message that may include the indication.

The indication may include timing information about timing of the wideband reception period.

The method may include closing the wideband transmission circuit outside the wideband transmission period.

The indication may include at least one wideband reception parameter associated with a reception of the wideband ranging message.

The wideband ranging response message may include timing information about a time difference between the receiving of the wideband ranging message and the transmitting of the wideband ranging response message.

The wideband ranging message is transmitted by a second wireless transceiver and wherein the response message may include timing information about an estimated time difference between a transmission of the wideband ranging message by the second wireless transceiver and a reception of the wideband ranging response message by the second wireless transceiver.

According to an embodiment of the invention there may be provided a non-transitory computer readable medium may store instructions that when executed by a computer cause the computer to execute the stages of receiving during a wideband reception period and by a wideband reception circuit of a first wireless transceiver a wideband ranging message; transmitting during a wideband transmission period and by a wideband transmission circuit of the first wireless transceiver a wideband ranging response message; receiving by a narrowband reception circuit of the first wireless transceiver received narrowband messages; and transmitting by a narrowband transmission circuit of the first wireless transceiver transmitted narrowband messages.

According to an embodiment of the invention there may be provided a wireless tag that may include a wireless transceiver that may include a wideband reception circuit, a narrowband reception circuit, a wideband transmission circuit and a narrowband transmission circuit; wherein the wideband reception circuit may be arranged to receive during a wideband reception period a wideband ranging message; wherein the wideband transmission circuit may be arranged to transmit during a wideband transmission period a wideband ranging response message; wherein the narrowband reception circuit may be arranged to receive narrowband messages; and wherein the narrowband transmission circuit may be arranged to transmit transmitted narrowband messages.

The narrowband reception circuit may be arranged to receive a received narrowband message that may include an indication about a future transmission of the wideband ranging message; and wherein the wideband reception circuit may be arranged to search for the wideband ranging message within the wideband reception period that is defined in response to the indication.

The wireless tag may be arranged to close the wideband reception circuit outside the wideband reception period.

The wireless tag may be arranged to start the wideband reception period after a predetermined delay period lapsed from the receiving of the received narrowband message that may include the indication.

The indication may include timing information about timing of the wideband reception period.

The wireless tag may be arranged to close the wideband transmission circuit outside the wideband transmission period.

The indication may include at least one wideband reception parameter associated with a reception of the wideband ranging message.

The wideband ranging response message may include timing information about a time difference between the receiving of the wideband ranging message and the transmitting of the wideband ranging response message.

The wideband ranging message may be transmitted by a second wireless transceiver and wherein the response message may include timing information about an estimated time difference between a transmission of the wideband ranging message by the second wireless transceiver and a reception of the wideband ranging response message by the second wireless transceiver.

According to an embodiment of the invention there may be provided a method for determining a location of a wireless tag, the method may include generating or receiving, by a wireless reader, information about multiple distance measurements of distances between the wireless tag and the wireless reader at different points of time; wherein the wireless reader is positioned at different locations in relation to the wireless reader at the different points of time; generating or receiving by the wireless reader information about a spatial relationship between the different locations or receiving information indicative of the spatial; and determining by the wireless reader, the location of the wireless tag in response to the multiple range measurements and the spatial relationship between the different locations.

The method may include generating by the wireless reader location information about the location of the wireless tag.

The method may include displaying on a display an indication about the location of the wireless tag, wherein the displaying is responsive to the information about the location of the wireless tag and an orientation of the display.

The different points in time may be are included in a time window and wherein the method may include ignoring distance measurements obtained outside the time window. The time window may be a sliding time window.

The determining of the location may include assigning different weights to different distance measurements.

The method may include generating by the wireless reader the information about the spatial relationship between the different locations by tracking by one or more sensors a trajectory of the wireless reader.

The method may include providing a rough estimate of a location of the item based upon a spatial relationship between a subset of the different locations.

The range measurements may include an exchange of messages between the wireless tag and the wireless reader; wherein the method may include receiving or calculating angular information about angles of reception of at least some of the messages; and wherein the determining by the wireless reader, of the location of the wireless tag is further responsive to the angular information.

The wireless reader may include an antenna array and the wireless reader may be arranged to estimate an angle of arrival of a message received from the item in response to reception signals obtained by the array of antennas.

The location of the wireless tag may be a relative location to the wireless reader. The location of the wireless tag may be an absolute location of the wireless tag.

According to an embodiment of the invention there may be provided a wireless reader that may include a wireless transceiver and a processor; wherein the wireless transceiver may be arranged to exchange wireless messages with a wireless tag at different points of time; wherein the wireless reader is positioned at different locations in relation to the wireless reader at the different points of time; wherein the processor may be arranged to (a) process at least some of the wireless messages to provide multiple distance measurements of distances between the wireless tag and the wireless reader as existed at the different point of time; (b) generate or receive information about a spatial relationship between the different locations or receiving information indicative of the spatial; and (c) determine by the wireless reader, the location of the wireless tag in response to the multiple range measurements and the spatial relationship between the different locations.

The wireless reader may be arranged to generate location information about the location of the wireless tag.

The wireless reader may be arranged to display on a screen an indication about the location of the wireless tag, wherein the display is responsive to the information about the location of the wireless tag and an orientation of the screen.

The different points in time may be included in a time window and wherein the wireless reader may be arranged to ignore distance measurements obtained outside the time window.

The time window may be a sliding time window.

The wireless reader may be arranged to determining the location by assigning different weights to different distance measurements.

The wireless reader may include one or more sensors that are arranged to track a trajectory of the wireless reader.

The wireless reader may be arranged to provide a rough estimate of a location of the item based upon a spatial relationship between a subset of the different locations.

The wireless reader may be arranged to exchange of messages with the wireless tag, to receive or calculate angular information about angles of reception of at least some of the messages; and determine the location of the wireless tag in response to the angular information.

The wireless reader may include an antenna array and the wireless reader may be arranged to estimate an angle of arrival of a message received from the item in response to reception signals obtained by the array of antennas.

The location of the wireless tag may be relative location to the wireless reader.

The location of the wireless tag may be an absolute location of the wireless tag.

According to an embodiment of the invention there may be provided a non-transitory computer readable medium may store instructions that when executed by a computer cause the computer to execute the stages of generating or receiving information about multiple distance measurements of distances between the wireless tag and the wireless reader at different points of time; wherein the wireless reader is positioned at different locations in relation to the wireless reader at the different points of time; generating or receiving information about a spatial relationship between the different locations or receiving information indicative of the spatial; and determining the location of the wireless tag in response to the multiple range measurements and the spatial relationship between the different locations

According to an embodiment of the invention there may be provided a method for managing a sphere of wireless tags, may include programming, by a wireless reader, a group of wireless tags to belong to the sphere of wireless tags; sending by the wireless reader sphere beacons aimed to the wireless tags of the sphere; detecting a loss of a wireless tag of the sphere if the wireless tag did not respond to a predetermined number of sphere beacons; and responding to the detecting of the loss of the wireless tag. A sphere is a group of wireless tags.

The method may include programming each wireless tag of the sphere to increase a wireless tag reception window for detecting a sphere beacon after the wireless tag failed to receive a predefined number of sphere beacons.

The method may include programming the wireless tags of the sphere to enter a first operational mode during reception window s that correspond to expected timing of transmission of the sphere beacons and to enter a second operational mode after responding to the sphere beacons, wherein the second operational mode is characterized by a lower power consumption than the first operational mode.

The method may include calculating or receiving information about distances between the wireless reader and multiple wireless tags; and selecting the wireless tags of the sphere out of the multiple wireless tags to be within a predetermined distance from the wireless tag.

The method may include programming the wireless tags to belong to the sphere only during predetermined time periods.

The programming may include instructing a wireless tag to transmit wireless tag identification information even without receiving beacon messages aimed to the wireless tag.



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stats Patent Info
Application #
US 20140145881 A1
Publish Date
05/29/2014
Document #
14085847
File Date
11/21/2013
USPTO Class
342386
Other USPTO Classes
International Class
01S5/02
Drawings
53


Wireless
Wireless Tag


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