CA2749148A1 - Determining speeds of radio frequency tags - Google Patents

Determining speeds of radio frequency tags Download PDF

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Publication number
CA2749148A1
CA2749148A1 CA2749148A CA2749148A CA2749148A1 CA 2749148 A1 CA2749148 A1 CA 2749148A1 CA 2749148 A CA2749148 A CA 2749148A CA 2749148 A CA2749148 A CA 2749148A CA 2749148 A1 CA2749148 A1 CA 2749148A1
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CA
Canada
Prior art keywords
signal
phase
different times
rfid tag
sampled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2749148A
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French (fr)
Other versions
CA2749148C (en
Inventor
Thomas J. Frederick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
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Sirit Technologies Inc
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Publication date
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Publication of CA2749148A1 publication Critical patent/CA2749148A1/en
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Publication of CA2749148C publication Critical patent/CA2749148C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
    • G01S13/92—Radar or analogous systems specially adapted for specific applications for traffic control for velocity measurement

Abstract

The present disclosure is directed to determining speeds of radio frequency tags. In some implementations, a method includes sampling a Radio Frequency (RF) signal from an RFID tag at a plurality of different times as the RFID tag approaches an RFID reader and recedes from the RFID reader. A phase of the RF signal is determined for each of the plurality of different times based, at least in part, on the sampled RF signal. A speed of the RFID tag is determined based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times.

Claims (20)

WHAT IS CLAIMED IS:
1. A method, comprising:
sampling a Radio Frequency (RF) signal from an RFID tag at a plurality of different times as the RFID tag approaches an RFID reader and recedes from the RFID reader;
determining a phase of the RF signal for each of the plurality of different times based, at least in part, on the sampled RF signal; and determining a speed of the RFID tag based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times and a height of the RFID tag.
2. The method of claim 1, further comprising determining a slope of a Doppler curve based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times, wherein the speed is determined based, at least in part, on the slope of the Doppler curve.
3. (Cancelled)
4. The method of claim 1, further comprising identifying a height of the RFID tag based, at least in part, on the sampled signal.
S. The method of claim 1, wherein determining the phase of the RF signal comprises estimating the phase of the RF signal for each of the plurality of different times based, at least in part, on the sampled RF signal.
6. The method of claim 5, wherein the phase of the RF signal is estimated based, at least in part, on a polynomial equation.
7. The method of claim 2, wherein determining a slope of a curve comprises:
estimating the curve of the phase of the RF signal as a function of the plurality of different times; and determining the slope of the curve at a specific time.
8. The method of claim 7, wherein the specific time is a time that the RFID tag is moving approximately tangential to the RFID reader.
9. The method of claim 7, wherein the estimated curve is determined based, at least in part, on a least-squares method.
10. A RFID reader, comprising:
an antenna that samples a RF signal from an RFID tag at a plurality of different times as the RFID tag approaches an RPID reader and recedes from the RFID reader;
an arctangent module that determines a phase of the RF signal for each of the plurality of different times based, at least in part, on the sampled RF
signal; and a phase module that determines a speed of the RFID tag based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times and a height of the RFID tag.
11. The RFID reader of claim 10, wherein the phase module further determines a slope of a Doppler curve based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times, wherein the speed is determined based, at least in part, on the slope of the Doppler curve.
12. (Cancelled)
13. The RFID reader of claim 10, wherein the phase module further identifies a height of the RFID tag based, at least in part, on the sampled signal.
14. The RFID reader of claim 10, wherein the arctangent module that determines the phase of the RF signal comprises the arctangent module that estimates the phase of the RF signal for each of the plurality of different times based, at least in part, on the sampled RF signal.
15. The RFID reader of claim 14, wherein the phase of the RF signal is estimated based, at least in part, on a polynomial equation,
16. The RFID reader of claim 11, wherein the phase module that determines the slope of the Doppler curve comprises the phase module that:
estimates the curve of the phase of the RF signal as a function of the plurality of different times; and determines the slope of the curve at a specific time.
17. The RFID reader of claim 16, wherein the specific time is a time that the RFID tag is moving approximately tangential to the RFID reader.
18. The RFID reader of claim 16, wherein the estimated curve is determined based, at least in part, on a least-squares method.
19. A system, comprising:
a means for sampling a Radio Frequency (RF) signal from an RFID tag at a plurality of different times as the RFID tag approaches an RFID reader and recedes from the RPID reader;
a means for determining a phase of the RF signal for each of the plurality of different times based, at least in part, an the sampled RF signal; and a means for determining a speed of the RFID tag based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times and a height of the RFID tag.
20. The system of claim 19, farther comprising a means for determining a slope of a Doppler curve based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times, wherein the speed is determined based, at least in part, on the slope of the Doppler curve.
CA2749148A 2009-01-09 2010-01-08 Determining speeds of radio frequency tags Expired - Fee Related CA2749148C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12/351,139 US8169312B2 (en) 2009-01-09 2009-01-09 Determining speeds of radio frequency tags
US12/351,139 2009-01-09
PCT/US2010/020475 WO2010080981A1 (en) 2009-01-09 2010-01-08 Determining speeds of radio frequency tags

Publications (2)

Publication Number Publication Date
CA2749148A1 true CA2749148A1 (en) 2010-07-15
CA2749148C CA2749148C (en) 2017-04-18

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CA2749148A Expired - Fee Related CA2749148C (en) 2009-01-09 2010-01-08 Determining speeds of radio frequency tags

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US (1) US8169312B2 (en)
EP (1) EP2377068B8 (en)
AU (1) AU2010203497B2 (en)
BR (1) BRPI1007207A2 (en)
CA (1) CA2749148C (en)
WO (1) WO2010080981A1 (en)

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