低信噪比下导航信号多普勒频率估计方法研究  

Research on Doppler Frequency Estimation Method of Navigation Signal Under Low Signal-to-Noise Ratio

作　　者：姜浩楠 刘连照[1] 王道酉[1] 徐宙 廉雨倩 郭玉峰 JIANG Haonan;LIU Lianzhao;WANG Daoyou;XU Zhou;LIAN Yuqian;GUO Yufeng

机构地区：[1]中国人民解放军63892部队,洛阳471003

出　　处：《现代导航》2024年第6期404-406,416,共4页Modern Navigation

摘　　要：全球导航卫星系统(GNSS)卫星与GNSS接收机相对距离遥远,到达GNSS接收机的卫星导航信号信噪比较低,GNSS接收机不易估计导航信号多普勒频率。另一方面,接收机工作在高动态环境也会导致接收到的卫星导航信号信噪比差。因此,研究了串行搜索算法、并行频率搜索算法和并行码相位搜索算法的原理以及在低信噪比条件下的适应能力,为接收机捕获算法的设计提供参考。Global Navigation Satellite System(GNSS)satellites are relatively far away from GNSS receivers,and the signal-to-noise ratio of satellite navigation signals reaching GNSS receivers is low,and it is not easy for GNSS receivers to estimate the Doppler frequency of navigation signals.On the other hand,the receiver operating in a highly dynamic environment will also lead to low signal-to-noise ratio of the received satellite navigation signal.Therefore,the principles of serial search algorithm,parallel frequency search algorithm and parallel code phase search algorithm and their adaptability under low signal-to-noise ratio conditions are studied,which provide a reference for the design of receiver acquisition algorithm.

关 键 词：低信噪比 多普勒频率 参数估计 并行搜索 捕获算法 

分 类 号：TN967.1[电子电信—信号与信息处理]