基于合成相关函数的BOC(n,n)型信号捕获算法

摘要

In order to solve the ambiguous acquiring problem for Binary Offset Carrier (BOC) modulated signals caused by multiple peaks of its autocorrelation function,we put forward a new acquisition algorithm based on combined correlation functions for BOC (n,n) signals through analyzing the autocorrelation function of the BOC modulated signal and the existing acquisition algorithms,and by use of the traditional acquisition algorithm of parallel code phase search acquisition.The algorithm is realized by adopting the autocorrelation of BOC (n,n) signal and cross-correlation of BOC (n,n) with Pseudo Random Noise (PRN) code,and through the operations of shifting ± Tc/2,summing,modulus and squaring.The theoretic analysis and simulation results show that:The proposed algorithm can remove the related side-peak,significantly improve the main-peak value and keep the autocorrelation peak width,while having an ideal acquisition performance,less computation cost,and is easy to implement.%针对BOC信号的自相关函数多峰性导致捕获模糊度的问题,通过分析BOC自相关函数及已有的捕获算法,结合并行码相位捕获的传统方法,提出了一种新的基于合成相关函数的BOC(n,n)型信号的捕获算法.该算法利用BOC(n,n)信号自相关以及BOC(n,n)和PRN码互相关,经移位±Tc/2、求和、取模、平方运算而实现.理论和仿真结果表明,该算法可以移除自相关函数的副峰,显著提高主峰峰值并且保证自相关主峰宽度,具有较好的捕获性能,且计算量小,易于实现.