CA2188667A1 - Global positioning system (gps) receiver for recovery and tracking of signals modulated with p-code - Google Patents

Global positioning system (gps) receiver for recovery and tracking of signals modulated with p-code

Info

Publication number
CA2188667A1
CA2188667A1 CA002188667A CA2188667A CA2188667A1 CA 2188667 A1 CA2188667 A1 CA 2188667A1 CA 002188667 A CA002188667 A CA 002188667A CA 2188667 A CA2188667 A CA 2188667A CA 2188667 A1 CA2188667 A1 CA 2188667A1
Authority
CA
Canada
Prior art keywords
gps
signals
code
correlated
signal
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
CA002188667A
Other languages
French (fr)
Other versions
CA2188667C (en
Inventor
Charles Robert Cahn
Richard Gerald Keegan
Jerry Eugene Knight
Thomas Atlee Stansell, Jr.
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.)
DirecTV Group Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2188667A1 publication Critical patent/CA2188667A1/en
Application granted granted Critical
Publication of CA2188667C publication Critical patent/CA2188667C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/709—Correlator structure
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/32—Multimode operation in a single same satellite system, e.g. GPS L1/L2
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems

Abstract

Method and apparatus for improving the speed and accuracy of processing signals from global positioning system (GPS) receivers (50, 52) by ensuring access to GPS carrier signals that have been modulated with an encrypted P-code sequence. In one disclosed embodiment of the invention, GPS L1 and L2 signals are correlated with a locally generated P-code signal (64, 62), bandpass filtered to enhance signal-to-noise ratio performance, and then cross-correlated (66) to obtain a signal with an L1-L2 frequency component that facilitates the resolution of carrier cycle ambiguity. In another embodiment, received GPS signals are immediately convened to digital form (114), then digitally correlated with in-phase and quadrature components of a locally generated P-code signal. Signals resulting from the correlation are then integrated (124, 126) over timing intervals corresponding to a previously determined encryption period to provide in-phase (I) and quadrature (Q) samples (130, 132).
CA002188667A 1994-05-02 1995-04-24 Global positioning system (gps) receiver for recovery and tracking of signals modulated with p-code Expired - Lifetime CA2188667C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/236,291 US5535278A (en) 1994-05-02 1994-05-02 Global positioning system (GPS) receiver for recovery and tracking of signals modulated with P-code
US08/236,291 1994-05-02
PCT/US1995/005140 WO1995030287A1 (en) 1994-05-02 1995-04-24 Global positioning system (gps) receiver for recovery and tracking of signals modulated with p-code

Publications (2)

Publication Number Publication Date
CA2188667A1 true CA2188667A1 (en) 1995-11-09
CA2188667C CA2188667C (en) 2003-12-30

Family

ID=22888917

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002188667A Expired - Lifetime CA2188667C (en) 1994-05-02 1995-04-24 Global positioning system (gps) receiver for recovery and tracking of signals modulated with p-code

Country Status (7)

Country Link
US (1) US5535278A (en)
EP (1) EP0763285B1 (en)
JP (1) JPH10505664A (en)
KR (1) KR970703068A (en)
CN (1) CN1149361A (en)
CA (1) CA2188667C (en)
WO (1) WO1995030287A1 (en)

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Also Published As

Publication number Publication date
AU2428295A (en) 1995-11-29
CA2188667C (en) 2003-12-30
AU706137B2 (en) 1999-06-10
WO1995030287A1 (en) 1995-11-09
US5535278A (en) 1996-07-09
CN1149361A (en) 1997-05-07
JPH10505664A (en) 1998-06-02
EP0763285A1 (en) 1997-03-19
EP0763285B1 (en) 2012-12-05
KR970703068A (en) 1997-06-10
EP0763285A4 (en) 1999-07-28

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