Method for generating unambiguous correlation function for CBOC(6,1,1/11) signal based on multi stage composition of partial correlation functions, apparatus for tracking CBOC signals and satellite navigation signal receiver system

摘要

A method of generating a correlation function for a CBOC(6,1,1/11) signal includes generating a first correlation function by performing a first elimination operation on a first and twelfth partial correlation function pair of 12 partial correlation functions, generating a fourth correlation function by performing a first elimination operation between second and third correlation functions that are generated by performing a second elimination operation between two difference functions between sixth and seventh partial correlation functions and the first correlation function, and generating a main correlation function by summing resulting waveforms that are generated by performing a first elimination operation between each of the 12 partial correlation functions and the fourth correlation function or by performing a first elimination operation between each of the remaining 8 partial correlation functions, excluding first, sixth, seventh and twelfth partial correlation functions from the 12 partial correlation functions, and the fourth correlation function.

主权项

1. A delay locked loop (DLL), comprising:
a local signal generation unit configured to generate an early and late delayed signal pair r(t+τ+Δ/2) and r(t+τ−Δ/2), early and late delayed, respectively, based on a phase delay τ and a delay value difference, with respect to a signal pulse train of a composite binary offset carrier (CBOC)(6,1,1/11)-modulated received signal r(t); early and late autocorrelation units configured to generate first to twelfth early partial correlation functions {Cm (τ+Δ/2)}m=011 and first to twelfth late partial correlation functions {Cm (τ−Δ/2)}m=011 by performing an autocorrelation operation of an early and late mixing signal pair with respect to the total time T(0≦t≦T); early and late first correlation function generation units configured to generate an early first correlation function R0(τ+Δ/2) by performing a first elimination operation on first and twelfth early partial correlation functions C0(τ+Δ/2) and C11(τ+Δ/2) and to generate a late first correlation function R0(τ−Δ/2) by performing a first elimination operation on first and twelfth early partial correlation functions C0(τ−Δ/2) and C11(τ−Δ/2); an early fourth correlation function generation unit configured to generate early second and third correlation functions R1(τ+Δ/2) and R2(τ+Δ/2) by performing second elimination operations between each of the two difference waveforms of the early sixth and seventh partial correlation functions C5(τ+Δ/2) and C6(τ+Δ/2) of the first to twelfth early partial correlation functions {Cm (τ+Δ/2)}m=011 and an early first correlation function R0(τ+Δ/2), and to acquire an early fourth correlation function R3(τ+Δ/2) by performing a first elimination operation on the early second and third correlation functions R1(τ+Δ/2) and R2(τ+Δ/2); a late fourth correlation function generation unit configured to generate late second and third correlation functions R1(τ−Δ/2) and R2(τ−Δ/2) by performing second elimination operations between each of the two difference waveforms of the late sixth and seventh partial correlation functions C5(τ−Δ/2) and C6(τ−Δ/2) of the first to twelfth late partial correlation functions {Cm (τ−Δ/2)}m=011 and a late first correlation function R0(τ−Δ/2), and to acquire a late fourth correlation function R3(τ−Δ/2) by performing a first elimination operation on the late second and third correlation functions R1(τ−Δ/2) and R2(τ−Δ/2); early and late combination units configured to acquire the early main correlation function Rproposed(τ+Δ/2) by summing results of an elimination operation between the early fourth correlation function R3(τ+Δ/2) and 8 early partial correlation functions {Cm (τ+Δ/2)}m=14 and {Cm(τ+Δ/2)}m=710 and the early fourth correlation function R3(τ+Δ/2), and to acquire the late main correlation function Rproposed (τ−Δ/2) by summing results of an elimination operation between the late fourth correlation function R3(τ−Δ/2) and 8 late partial correlation functions {Cm (τ−Δ/2)}m=14 and {Cm (τ−Δ/2)}m=710 and the late fourth correlation function R3(τ−Δ/2); and a numerical control oscillator (NCO) configured to determine a phase delay τ of a delayed signal for the received signal based on values of the early and late main correlation functions, and to output the determined phase delay τ to the local signal generation unit; wherein the first elimination operation is an operation that satisfies algebraic relations in which |A|+|B|−|A−B|=0 if real numbers A and B satisfy AB≦0 and |A|+|B|−|A−B|>0 if real numbers A and B satisfy AB>0; and wherein the second elimination operation is an operation that performs |A+B|−|A| with respect to real numbers A and B.