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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
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
A method and a system for the acquisition and tracking of BOC(m,n) modulated codes, m/n equal to an integer, in which a correlation function is calculated of the BOC(m,n) modulated code received from a remote transmitter with a code wa locally generated at a receiver terminal according to one from the following the relationships:; wa(τ)=c(τn)−a·[prn(τn+Tc/2)−prn(τn−Tc/2)]; wa(τ)=c(τn)−a·[prn(τn+nTc/2m)−prn(τn−nTc/2m)]; wa(τ)=c(τn)−a·[prn(τn+nTc/4m)+prn(τn−nTc/4m)]; wa(τ)=c(τn)−a·[prn(τn+3nTc/4m)+prn(τn−3nTc/4m)]; w(τ)=[prn(τn+nTc/4m)+prn(τn−nTc/4m)]; w(τ)=[prn(τn+nTc/2m)−prn(τn−nTc/2m)]wherein c(τ) is a local replica of the BOC modulated pseudo-random noise code with delay τn, PRN(τ) is a replica of the unmodulated pseudo-random noise code, and a is a predetermined weight coefficient, andthe correlation function being at the base of an acquisition test function whereby a code acquisition is recognized for a value of the test function being higher than a predetermined threshold.展开▼
机译：一种用于获取和跟踪m / n等于整数的BOC（m，n）调制码的方法和系统，其中计算从远程发射机接收到的BOC（m，n）调制码的相关函数根据以下关系之一在接收方终端本地生成的代码w a ： <？in-line-formulae description =“在线公式” end =“线索”？> w a （τ）= c （τ n ）− a·[prn （τ n < / Sub> + T c / 2）- prn （τ n -T c / 2）] <？in-line-formulae description =“ In-line Formulae” end =“ tail”？>; <？in-line-formulae description =“在线公式” end =“线索”？> w a （τ）= c （τ n ）− a·[prn （τ n < / Sub> + nT c / 2 m ）− prn （τ n -nT c / 2 m ）] <？in-line-formulae description =“ In-line Formulae” end =“ tail”？ >; <？in-line-formulae description =“在线公式” end =“线索”？> w a （τ）= c （τ n ）− a·[prn （τ n < / Sub> + nT c / 4 m ）+ prn （τ n -nT c / 4 m ）] <？in-line-formulae description =“ In-line Formulae” end =“ tail”？ >; <？in-line-formulae description =“在线公式” end =“线索”？> w a （τ）= c （τ n ）− a·[prn （τ n < / Sub> +3 nT c / 4 m ）+ prn （τ n −3 nT c / 4 m ）] <？in-line-formulae description =“ In-line Formulae” end =“ tail “？>; <？in-line-formulae description =“在线公式” end =“线索”？> w （τ）= [ prn （τ n + nT c / 4 m ）+ prn （τ n -nT c / 4 m ）] <？in-line-formulae description =“ In-line Formulae” end =“ tail”？>; <？in-line-formulae description =“在线公式” end =“线索”？> w （τ）= [ prn （τ n + nT c / 2 m ）− prn （τ n -nT c / 2 m ）] <？in-line-formulae description =“ In-line Formulae” end =“ tail”？> 其中，c（τ）是BOC调制的伪随机变量的本地副本。延迟为τ n 的随机噪声代码，PRN（τ）是未调制伪随机噪声代码的副本，a是预定的权重系数，并且 相关函数位于获取测试功能的基础上，由此针对测试功能的值高于预定阈值的情况识别代码获取。 < / ListItem>
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