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Method and system for resolving the acquisition ambiguity and the problem of false lock in tracking BOC(m,n) modulated signals, particularly for satellite positioning/navigation systems

  • US 7,949,038 B2
  • Filed: 12/12/2007
  • Issued: 05/24/2011
  • Est. Priority Date: 12/12/2006
  • Status: Active Grant
First Claim
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1. A method for the acquisition and tracking of Binary Offset Carrier (BOC) (n,n) modulated codes, particularly for satellite positioning/navigation systems, comprising the steps of:

  • acquiring at a receiver terminal a Binary Offset Carrier (BOC)(n,n) modulated pseudo-random noise code, from a remote transmitter;

    generating a local replica of said pseudo-random noise code at the receiver terminal; and

    calculating a correlation function of the Binary Offset Carrier (BOC)(n,n) modulated code received with a code wa locally generated according to the relationship
    wa

    )=c

    n)−



    [prn


    n+Tc/2)−

    prn

    n

    T
    c/2)]wherein c(τ

    ) is a local replica of said Binary Offset Carrier (BOC) modulated pseudo-random noise code with delay τ

    n, PRN(τ

    ) is a replica of said unmodulated pseudo-random noise code, and a is a predetermined non-zero weight coefficient,said correlation function being at the base of an acquisition test function, whereby a code acquisition is recognized for a value of said test function being higher than a predetermined threshold.

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