改进差分相干累加算法的北斗卫星导航弱信号捕获  

Beidou satellite navigation weak signal acquisition with improved differential coherent accumulation algorithm

作　　者：李学涛 孙爽杰 LI Xuetao;SUN Shuangjie(Ningbo Almaty Digital Technology Company Limited,Ningbo Zhejiang 315042,China)

机构地区：[1]宁波市阿拉图数字科技有限公司,浙江宁波315042

出　　处：《北京测绘》2023年第10期1431-1436,共6页Beijing Surveying and Mapping

摘　　要：以提升北斗卫星导航能力为目的,设计了改进差分相干累加算法的北斗卫星导航弱信号捕获方法。该方法通过构建北斗卫星信号模型,利用该模型获得北斗卫星导航中频信号;然后以改进差分相干累加算法为基础,建立北斗卫星导航弱信号捕获模型,将北斗卫星导航中频信号作为该模型的输入,经过北斗卫星导航弱信号捕获模型对中频信号块实施累加处理和多普勒圆周位移搜索,以及快速傅里叶变换和反傅里叶变换等步骤后,通过判断北斗卫星导航弱信号捕获判决,输出北斗卫星导航弱信号捕获结果。实验结果表明:该方法在捕获北斗卫星导航弱信号时的运算量较小,可有效捕获-36dB的北斗卫星导航弱信号,同时其捕获概率较高,应用效果较为显著。To improve the Beidou satellite navigation capability,the Beidou satellite navigation weak signal acquisition method with improved differential coherent accumulation algorithm is studied.In this method,the Beidou satellite navigation IF signal is obtained by building a Beidou satellite signal model;Then,based on the improved differential coherent accumulation algorithm,a Beidou satellite navigation weak signal acquisition model is established.The Beidou satellite navigation IF signal is taken as the input of the model.After the Beidou satellite navigation weak signal acquisition model performs the accumulation processing and Doppler circular displacement search on the IF signal block,as well as fast Fourier transform and inverse Fourier transform,the Beidou satellite navigation weak signal acquisition decision is judged,Output Beidou satellite navigation weak signal acquisition results.The experimental results show that this method has less computation when capturing Beidou satellite navigation weak signal,and can effectively capture-36 dB Beidou satellite navigation weak signal.At the same time,its acquisition probability is high,and the application effect is significant.

关 键 词：差分相干累加 北斗卫星导航 弱信捕获 信号模型 中频信号块 多普勒圆周移位 

分 类 号：TN961[电子电信—信号与信息处理]