一种克服NH码调制影响的北斗卫星信号捕获方法

Beidou Signal Acquisition Method Overcoming NH Code Modulation

基于北斗公开服务信号B1的结构特点,通过理论分析得出了NH码调制对北斗卫星信号在弱信号环境下捕获的影响,并通过仿真验证了理论分析的正确性,最后提出基于二次精频搜索的捕获方法,克服了这种影响。研究结果对北斗弱信号捕获技术的深入研究具有重要指导意义,能够为其他更优秀的北斗弱信号捕获方案提供理论依据。

Based on the structure of Beidou public service signal B1, this paper analyzes the effect of NH code modulation on the Beidou weak signal acquisition, and a theory resuh is achieved. The necessary simulation tests validate that the theory analysis is correct. Besides, a new Beidou signal acquisition method based on two-stage fine frequency search is proposed. The simulation tests demonstrate that the proposed method is able to overcome the effect of NH code modulation. These results can be an important reference to the comprehensive research of Beidou weak signal acquisition technologies, and some better Beidou weak signal acquisition algorithms could be developed based on the results.