CA2141224A1 - System and method for identifying an arrival time of a communicated signal - Google Patents

System and method for identifying an arrival time of a communicated signal

Info

Publication number
CA2141224A1
CA2141224A1 CA002141224A CA2141224A CA2141224A1 CA 2141224 A1 CA2141224 A1 CA 2141224A1 CA 002141224 A CA002141224 A CA 002141224A CA 2141224 A CA2141224 A CA 2141224A CA 2141224 A1 CA2141224 A1 CA 2141224A1
Authority
CA
Canada
Prior art keywords
sequence
correlator
timing
preloaded
bit
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
CA002141224A
Other languages
French (fr)
Other versions
CA2141224C (en
Inventor
Thomas Michael Fox
Neal Robert Anderson
Julius Anthony Heeren
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 filed Critical Motorola Inc
Publication of CA2141224A1 publication Critical patent/CA2141224A1/en
Application granted granted Critical
Publication of CA2141224C publication Critical patent/CA2141224C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • G01S1/04—Details
    • G01S1/045—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
    • G01S5/0205—Details
    • G01S5/0218—Multipath in signal reception

Abstract

A transmitter (12) broadcasts a PN encoded message (16).
A receiver (14) includes a SAW correlator (38) configured to autocorrelate with the PN sequence used in the broadcast signal.
A preamble of the message (16) conveys two successive bits (18) that are each encoded with the PN sequence. After the correlator (38) has been preloaded with the PN sequence from the first bit (18), its non-correlation output exhibits reduced amplitude time sidelobes. A timing comparison circuit (60) compares a correlation signal (46) with a timing threshold (72). The timing threshold (72) is established at a very low level to minimize the influence of multipath. False triggering on noise is prevented by disabling the timing comparison circuit (60) until after the first bit {18). At this point in time the correlator (38) has been preloaded with its PN sequence, is again being loaded with its PN
sequence, and outputs reduced amplitude time sidelobes.
CA002141224A 1994-03-10 1995-01-27 System and method for identifying an arrival time of a communicated signal Expired - Fee Related CA2141224C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/209,657 US5488662A (en) 1994-03-10 1994-03-10 System and method for identifying an arrival time of a communicated signal
US08/209,657 1994-03-10

Publications (2)

Publication Number Publication Date
CA2141224A1 true CA2141224A1 (en) 1995-09-11
CA2141224C CA2141224C (en) 2005-08-02

Family

ID=22779692

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002141224A Expired - Fee Related CA2141224C (en) 1994-03-10 1995-01-27 System and method for identifying an arrival time of a communicated signal

Country Status (2)

Country Link
US (1) US5488662A (en)
CA (1) CA2141224C (en)

Families Citing this family (24)

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Publication number Priority date Publication date Assignee Title
JP2937743B2 (en) * 1994-04-28 1999-08-23 沖電気工業株式会社 Spreading code generator for spread spectrum communication
US5748891A (en) * 1994-07-22 1998-05-05 Aether Wire & Location Spread spectrum localizers
US5550549A (en) * 1995-02-28 1996-08-27 Harris Corporation Transponder system and method
JP3299885B2 (en) * 1996-03-22 2002-07-08 和夫 坪内 Wireless data transceiver
US6252863B1 (en) 1996-04-09 2001-06-26 Trimble Navigation Limited Multipath compensation for pseudorange signals
JP3494800B2 (en) * 1996-04-15 2004-02-09 和夫 坪内 Wireless IC card system
US6002361A (en) * 1996-04-30 1999-12-14 Trimble Navigation Limited Direct integrated approach to multipath signal identification
US5903597A (en) * 1996-05-20 1999-05-11 Trimble Navigation Limited Suppression on multipath signal effects
US5963601A (en) * 1996-05-20 1999-10-05 Trimble Navigation Limited Variable suppression of multipath signal effects
US5828694A (en) * 1996-07-01 1998-10-27 Trimble Navigation Limited Determination of multipath tracking error
EP0917655A4 (en) * 1996-08-10 2001-04-04 Sanconix Inc Enhanced time of arrival method
US6204813B1 (en) 1998-02-20 2001-03-20 Trakus, Inc. Local area multiple object tracking system
CA2250367A1 (en) * 1997-10-27 1999-04-27 Helene Vogel Device for measuring the distance between a mobile station and a base station in a mobile radiocommunication system
US6157592A (en) * 1998-07-06 2000-12-05 Resolution Displays, Inc. Acoustic position determination method and apparatus
US6795491B2 (en) * 1999-07-22 2004-09-21 Aether Wire & Location Spread spectrum localizers
US6937639B2 (en) * 2001-04-16 2005-08-30 Time Domain Corporation System and method for positioning pulses in time using a code that provides spectral shaping
US6762712B2 (en) * 2001-07-26 2004-07-13 Time Domain Corporation First-arriving-pulse detection apparatus and associated methods
US6963727B2 (en) * 2001-07-26 2005-11-08 Time Domain Corporation Direct-path-signal detection apparatus and associated methods
US7548579B1 (en) 2003-03-31 2009-06-16 3Com Corporation Symbol spreading method and device for OFDM systems
US7203245B1 (en) 2003-03-31 2007-04-10 3Com Corporation Symbol boundary detector method and device for OFDM systems
US7280621B1 (en) 2003-03-31 2007-10-09 3Com Corporation Preamble detector method and device for OFDM systems
US8032107B1 (en) * 2003-06-26 2011-10-04 Cypress Semiconductor Corporation Power management by constant awake correlator
US7667649B2 (en) * 2007-12-10 2010-02-23 Trueposition, Inc. Detection of time of arrival of CDMA signals in a wireless location system
US8022869B2 (en) * 2008-05-29 2011-09-20 Qualcomm Incorporated Apparatus and method for cross-correlation spur mitigation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150372A (en) * 1959-06-23 1964-09-22 Motorola Inc Computing system
US3307192A (en) * 1965-03-26 1967-02-28 Motorola Inc Navigation system
US4975707A (en) * 1989-07-13 1990-12-04 Energetics Satellite Corporation Multiple satellite locating system
US5051741A (en) * 1990-03-28 1991-09-24 Wesby Philip B Locating system
JPH0777362B2 (en) * 1990-08-28 1995-08-16 クラリオン株式会社 Spread spectrum communication device
JP2831122B2 (en) * 1990-11-29 1998-12-02 クラリオン株式会社 Spread spectrum communication system
US5267271A (en) * 1991-09-27 1993-11-30 Lockheed Missiles & Space Company, Inc. Signal analysis technique for determining a subject of binary sequences most likely to have been transmitted in a multi-node communication network
US5179573A (en) * 1992-02-13 1993-01-12 Gec-Marconi Electronic Systems Corp. Amplitude measurement of received pseudonoise sequence using digital correlation
US5184135A (en) * 1992-03-23 1993-02-02 Gec-Marconi Electronic Systems Corp. Phase measurement of received pseudonoise sequence using digital correlation

Also Published As

Publication number Publication date
CA2141224C (en) 2005-08-02
US5488662A (en) 1996-01-30

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