WO2005020600A3 - Measuring distance using wireless communication - Google Patents

Measuring distance using wireless communication Download PDF

Info

Publication number
WO2005020600A3
WO2005020600A3 PCT/EP2004/051289 EP2004051289W WO2005020600A3 WO 2005020600 A3 WO2005020600 A3 WO 2005020600A3 EP 2004051289 W EP2004051289 W EP 2004051289W WO 2005020600 A3 WO2005020600 A3 WO 2005020600A3
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
signal
strength value
wireless communication
path length
Prior art date
Application number
PCT/EP2004/051289
Other languages
French (fr)
Other versions
WO2005020600A2 (en
Inventor
Ariel Luzzatto
Salomon Serfaty
Original Assignee
Motorola Inc
Ariel Luzzatto
Salomon Serfaty
Motorola Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Motorola Inc, Ariel Luzzatto, Salomon Serfaty, Motorola Ltd filed Critical Motorola Inc
Priority to DE112004001544T priority Critical patent/DE112004001544T5/en
Publication of WO2005020600A2 publication Critical patent/WO2005020600A2/en
Publication of WO2005020600A3 publication Critical patent/WO2005020600A3/en
Priority to US11/359,246 priority patent/US7515103B2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation 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
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/022—Means for monitoring or calibrating
    • G01S1/026—Means for monitoring or calibrating of associated receivers
    • 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
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/14—Determining absolute distances from a plurality of spaced points of known location

Abstract

A method of estimating the distance between a first wireless communication terminal and a second wireless communication terminal includes: (i) receiving at the first terminal a received signal comprising a composite multipath derivative of a RF transmission signal transmitted by a second terminal which transmission signal comprises an OFDM signal; and (ii) processing the received signal including performing a demodulation operation to produce a demodulated signal; and characterised by: (iii) resolving the demodulated signal into a plurality of components corresponding to different path length components included in the received signal; (iv) identifying which of the resolved components corresponds to a shortest path length; and (v) for the identified component, computing a time of travel from the second terminal to the first terminal. the first terminal may be operable to determine a strength value for each of the resolved components. The strength value may be compared with a threshold value to determine if the strength value is to be considered as non-zero, whereby the component having that strength value is to be included to find the component having the shortest path length. Also described is a terminal which operates to carry out these steps and a method of transmitting and receiving an OFDM signal which includes these steps. The transmitted signal which is transmitted by the second terminal and received in a multipath derivative form by the first terminal may conveniently be the PLCP (Physical Layer Convergence Procedure) Training Signal defined in the 802.11 standard. This is the 'Long Training Sequence' normally provided at the beginning of a transmission by a terminal in a LAN (e.g. a RU). The purpose of this signal is to allow another terminal (e.g. an AP) to synchronize with the terminal.
PCT/EP2004/051289 2003-08-21 2004-06-29 Measuring distance using wireless communication WO2005020600A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112004001544T DE112004001544T5 (en) 2003-08-21 2004-06-29 Measuring a distance using wireless communication
US11/359,246 US7515103B2 (en) 2003-08-21 2006-02-21 Measuring distance using wireless communication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0319703.5 2003-08-21
GB0319703A GB2405276B (en) 2003-08-21 2003-08-21 Measuring distance using wireless communication

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/359,246 Continuation US7515103B2 (en) 2003-08-21 2006-02-21 Measuring distance using wireless communication

Publications (2)

Publication Number Publication Date
WO2005020600A2 WO2005020600A2 (en) 2005-03-03
WO2005020600A3 true WO2005020600A3 (en) 2005-04-28

Family

ID=28460094

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/051289 WO2005020600A2 (en) 2003-08-21 2004-06-29 Measuring distance using wireless communication

Country Status (5)

Country Link
US (1) US7515103B2 (en)
CN (1) CN1853114A (en)
DE (1) DE112004001544T5 (en)
GB (1) GB2405276B (en)
WO (1) WO2005020600A2 (en)

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US7471954B2 (en) * 2006-02-24 2008-12-30 Skyhook Wireless, Inc. Methods and systems for estimating a user position in a WLAN positioning system based on user assigned access point locations
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US20080057865A1 (en) * 2006-09-05 2008-03-06 Broadcom Corporation, A California Corporation Wireless terminal making attachment decisions based upon mobility
US7856234B2 (en) * 2006-11-07 2010-12-21 Skyhook Wireless, Inc. System and method for estimating positioning error within a WLAN-based positioning system
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CN101741805B (en) * 2010-01-29 2013-03-27 华为技术有限公司 Signal modulating method and device as well as signal modulating system
US9253605B2 (en) 2010-03-24 2016-02-02 Skyhook Wireless, Inc. System and method for resolving multiple location estimate conflicts in a WLAN-positioning system
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US8570914B2 (en) 2010-08-09 2013-10-29 Corning Cable Systems Llc Apparatuses, systems, and methods for determining location of a mobile device(s) in a distributed antenna system(s)
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EP0613021A1 (en) * 1993-02-22 1994-08-31 France Telecom Process, apparatus and transmitter for radiolocation utilising a multicarrier radio distribution system
CA2396639A1 (en) * 2001-08-07 2003-02-07 At&T Corp. A simulcasting ofdm system having mobile station location identification

Also Published As

Publication number Publication date
WO2005020600A2 (en) 2005-03-03
DE112004001544T5 (en) 2006-06-29
GB2405276B (en) 2005-10-12
US7515103B2 (en) 2009-04-07
CN1853114A (en) 2006-10-25
US20060197704A1 (en) 2006-09-07
GB2405276A (en) 2005-02-23
GB0319703D0 (en) 2003-09-24

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