一种“北斗”B1C信号无模糊捕获算法

An Unambiguous Acquisition Algorithm for Beidou B1C Signal

针对"北斗"B1C信号同步过程中存在的捕获模糊性问题,根据"北斗"B1C信号的信号特点,基于伪相关函数方法,设计了一种适用于"北斗"B1C信号的无模糊捕获算法。该算法采用数据分量和导频分量非相干组合的捕获策略,实现了B1C信号数据分量和导频分量的无模糊捕获,提高了捕获灵敏度。利用导航终端接收的卫星信号数据,对所提捕获算法进行了仿真验证,并分析了其无模糊捕获性能和捕获灵敏度。仿真结果表明,所提算法能准确且快速地捕获"北斗"B1C信号。

For the acquisition ambiguity in the synchronization process of Beidou B1 C signal,according to signal characteristics of Beidou B1 C signal,an unambiguous acquisition algorithm based on pseudo correlation function( PCF) for Beidou B1 C Signal is designed,and acquisition strategy for noncoherent combination of data component and pilot component is used in the algorithm. The unambiguous acquisition of data component and pilot component of B1 C signal is realized,and the acquisition sensitivity is improved. The satellite signal data received by the navigation terminal is used for the simulation of the acquisition algorithm,and unambiguous acquisition performance and acquisition sensitivity of the algorithm are analyzed. The simulation shows that the acquisition algorithm proposed can acquire Beidou B1 C signal accurately and quickly.