Indoor Localization Using Bluetooth High-Accuracy Distance Measurement

Patent metadata

Field	Value
Publication number	US-2022390547-A1
Application number	US-202217820101-A
Country	US
Kind code	A1
Filing date	Aug 16, 2022
Priority date	Aug 15, 2022
Publication date	Dec 8, 2022
Grant date	—

Abstract

This document describes techniques and systems for indoor localization using Bluetooth high-accuracy distance measurement (HADM). In examples, the described systems and techniques perform a signal-strength scan to identify multiple anchor points and then pair, based on the signal-strength scan, the tagged device with a first anchor point of the identified anchor points. A HADM time slot is set for the first anchor point and at least two additional anchor points of the identified anchor points. A HADM event is initiated, the HADM event including sending a HADM ping and receiving HADM responses from two or more of the identified anchor points. Based on at least a time of receipt of HADM responses received from the two or more of the identified anchor points, the location of the tagged device is calculated.

First claim

1 . A method for determining a location of a high-accuracy distance measurement (HADM) tagged device, the method comprising:
performing a signal-strength scan to identify multiple anchor points; pairing, based on the signal-strength scan, the tagged device with a first anchor point of the identified anchor points; setting a HADM time slot for the first anchor point and at least two additional anchor points of the identified anchor points; initiating a HADM event, the HADM event comprising:
sending a HADM ping; and
receiving HADM responses from two or more of the identified anchor points; and
calculating, based on at least a time of receipt of HADM responses received from the two or more of the identified anchor points, the location of the tagged device.

2 . The method of claim 1 , wherein receiving the HADM responses comprises receiving a HADM response from the first anchor point, and wherein the calculating the location of the tagged device is further based on a time at which the tagged device sent the HADM ping.

3 . The method of claim 2 , wherein setting the HADM time slot comprises:
providing a list of the multiple anchor points identified by the tagged device to the first anchor point; and receiving a designation from the first anchor point at the additional anchor points, the designation selecting the additional anchor points for the HADM time slot and directing the additional anchor points to prepare to respond to the HADM ping from the tagged device.

4 . The method of claim 2 , wherein sending the HADM ping comprises:
sending a single HADM ping to trigger the first anchor point and the additional anchor points to send the HADM responses.

5 . The method of claim 1 , further comprising:
receiving location data from the first anchor point, wherein the location data comprises location data for the first anchor point and the additional anchor points, wherein calculating the location of the tagged device is performed using the location data for the first anchor point and one or more of the additional anchor points.

6 . The method of claim 1 , further comprising:
receiving location data from the first anchor point; and receiving location data from the additional anchor points, wherein calculating the location of the tagged device is further performed using the location data for the first anchor point and one or more of the additional anchor points.

7 . The method of claim 1 , wherein calculating the location of the tagged device further comprises calculating a triangular trajectory.

Assignees

• Google Llc

Inventors

• Chuo Li-Xuan
• Jiang Qi
• Fernandes Barros Daniel Jose

Classifications

• Y02D30/70

  in wireless communication networks · CPC title

• G01S5/06 Primary

  Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements (G01S5/12 takes precedence) · CPC title

• H04W64/003

  locating network equipment · CPC title

• G01S2205/02

  Indoor · CPC title

• G01S7/006

  using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence) · CPC title