RFID module for through boundary location accuracy

Patent metadata

Field	Value
Publication number	US-10521627-B2
Application number	US-201916532380-A
Country	US
Kind code	B2
Filing date	Aug 5, 2019
Priority date	Mar 13, 2018
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A method and data processing device for detecting and tracking objects in a space. The method includes transmitting an inquiry signal that traverses into the space, which is behind a physical barrier and is pre-configured with a plurality of radio frequency identification (RFID) tags. The method includes transmitting, via a RFID module, a second signal at a second frequency range. The method includes monitoring for a RFID response signal, which is a backscatter signal generated in response to the second signal impinging on the RFID tag and one or more objects in the space. The method includes identifying and extracting an interference reflection signal from the response signal to determine a presence of an unknown object. The method includes tracking the unknown object within the space and providing more specific position data of the unknown object within the space, to a display of an electronic device.

First claim

What is claimed is:

1. A method comprising:
transmitting, from a first module, a first inquiry signal, at a first frequency range, that traverses into a space existing behind a physical barrier, the space pre-configured with a plurality of radio frequency identification (RFID) tags, each RFID tag capable of producing a backscatter signal;
transmitting, via a RFID module, a second signal at a second frequency range;
monitoring for a response signal to the first inquiry signal and the second signal emitted at the first frequency range and the second frequency range, respectively, the response signal being a backscatter signal;
identifying and extracting an interference reflection signal from the response signal to determine a presence of an unknown object; and
in response to detecting the presence of the unknown object, tracking the unknown object within the space, and providing more specific position data of the unknown object within the space, to a display of an electronic device.

2. The method of claim 1 , further comprising:
transmitting the second signal as an RFID transmit signal, wherein the RFID transmit signal has a constant amplitude, frequency, and phase that produces the backscatter signal by inducing a voltage on an antenna of the at least one of the plurality of RFID tags; and
identifying the at least one of the plurality of RFID tags based on modulation of a respective tag identification on the backscatter signal, wherein a variation in an impedance on the antenna of the at least one of the plurality of RFID tags corresponds to the respective tag identification.

3. The method of claim 1 , wherein transmitting, from a first module, a first inquiry signal further comprises transmitting, from a Bluetooth Low Energy (BLE) module, a Bluetooth inquiry signal.

4. The method of claim 1 , wherein the space is at least partially enclosed by a plurality of surfaces, with at least one surface having the plurality of RFID tags and the backscatter signal comprises a combination of a RFID tag reflection signal, a known reflection signal from a known object, and the interference reflection signal from the unknown object in the space.

5. The method of claim 1 , further comprising:
identifying, from at least one extracted interference reflection signal, a time of flight of the second signal, a received signal strength (RSS) and a phase value of the at least one extracted interference reflection signal, wherein the time of flight, the RSS, and the phase value of the at least one extracted interference reflection signal identifies, at least in part, the more specific position data of the detected object when the detected object is observed within the space;
determining a trajectory of the unknown object based, at least in part, on the time of flight of the second signal, the RSS and the phase value of the second signal; and
determining a velocity of the unknown object based, at least in part, on a tag identification associated with each extracted interference reflection signal.

6. The method of claim 1 , providing more specific position data of the detected object within the space to a database, wherein the database is a location-based operation mapping database, and the method further comprises:
archiving the more specific position data in the database; and
periodically updating the database with the more specific position data received from one or more RFID reader modules in response to receiving, at one or more RFID modules, the response signal that is read from at least one of the plurality of RFID tags.

7. The method of claim 6 , further comprising:
aggregating position data received in real-time with position data that is archived, to form a known pattern of specific movements; and
correlating, within the location-based operation mapping database, the known pattern of specific movements occurring within the space with a resulting operation that can affect one or more objects within the space, a user device, a user of the user device, and an operational system.

8. The method of claim 6 , further comprising:
detecting at least one subsequent response signal corresponding to movement of the detected object; and
identifying, from the location-based operation mapping database, position data associated with a collection of response signals that are collected by one or more RFID modules in vicinity to space to pinpoint spatial coordinates of one or more objects within the space and track movement of the detected object within the space.

9. The method of claim 1 , further comprising:
monitoring, via the RFID module, an identified RFID tag and one or more RFID tags in vicinity to the identified RFID tag to detect a subsequent response signal;
identifying, from evaluation of the subsequent response signal, movement of the detected object within the space; and
determining when the subsequent response signal correlates to a presence of a next object within the space.

10. The method of claim 1 , further comprising:
identifying that the RFID module is in motion at a determined velocity above a predetermined threshold velocity; and
in response to the RFID module being in motion at a velocity above the threshold velocity, delaying transmission of the second signal until the determined velocity of the RFID module is less than the threshold velocity.

11. A data processing device comprising:
a first module that transmits a first inquiry signal, at a first frequency range, that traverses into a space existing behind a physical barrier, the space pre-configured with a plurality of radio frequency identification (RFID) tags, each RFID tag capable of producing a backscatter signal;
a monitoring component that monitors for a corresponding response signal to the first inquiry signal that is emitted at the first frequency range; and
a processor that is communicatively coupled to the first module, the monitoring component and an RFID module and which:
transmits, via the RFID module, a second signal at a second frequency range;
monitors for a response signal from at least one of the plurality of RFID tags, the response signal being generated, respectively, in response to the first inquiry signal and the second signal, the response signal being a backscatter signal;
identifies and extracts an interference reflection signal from the response signal to determine a presence of an unknown object; and
in response to detecting the presence of the unknown object, tracks the unknown object within the space, and provides, to a display, more specific position data of the unknown object within the space.

12. The data processing device of claim 11 , wherein the RFID module:
transmits the second signal as an RFID transmit signal, wherein the RFID transmit signal has a constant amplitude, frequency, and phase that produces the backscatter signal by inducing a voltage on an antenna of the at least one of the plurality of RFID tags; and
identifies the at least one of the plurality of RFID tags based on modulation of a respective tag identification on the backscatter signal, wherein a variation in an impedance on the antenna of the at least one of the plurality of RFID tags corresponds to the respective tag identification.

13. The data processing device of claim 11 , wherein:
the response signal is a backscatter signal that is a combination of a RFID tag reflection signal, a known reflection signal from a known object, and the interference reflection signal from the unknown object in the space; and
the processor:
identifies, from at least one extracted interference reflection signal, a time of flight of the second signal, a received signal strength (RSS), and a

Assignees

• Motorola Mobility Llc

Inventors

• Song Miao
• Wang Yunming
• Tyagi Vivek
• Madhusudhana Nikhil Ambha
• Vissa Sudhir

Classifications

• G06F16/29 Primary

  Geographical information databases · CPC title

• G06K7/10475 Primary

  arrangements to facilitate interaction with further interrogation devices, e.g. such that at least two interrogation devices may function and cooperate in a network of such devices · CPC title