基于星历匹配的导航电文快速帧同步算法  

A Quick Frame Synchronization Method for Navigation Message Based on Ephemeris Matching

作　　者：房晓丽 彭晖 吴礼杰 FANG Xiaoli;PENG Hui;WU Lijie(School of Electronic Information,Hunan Institute of Information Technology,Changsha 410151,China;College of Electronic Science,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]湖南信息学院电子信息学院,长沙410151 [2]国防科技大学电子科学学院,长沙410073

出　　处：《现代雷达》2021年第4期34-38,共5页Modern Radar

基　　金：湖南省教育厅科学研究资助项目(18C1583);湖南省教育厅科学研究优秀青年项目(19B395);湖南省教育厅科学研究重点项目(18A511)。

摘　　要：卫星导航已经成为各类高精度制导导弹的主要导航手段。由于整个飞行时间很短,弹载接收机为了减小首次定位时间通常会预先加注真实的星历数据。受GPS L1C/A信号电文格式限制,传统使用帧头进行同步的方法在最差情况下需要6 s的时间。针对该问题,文中提出了基于星历匹配的电文快速帧同步算法,利用预加注的星历数据与接收信号进行匹配,从而完成电文的帧同步。理论分析和仿真结果表明:相比传统的基于帧头的帧同步算法,该算法平均同步时间可缩短约25%。Satellite navigation has been the primary method of various high precision guided boom.Because of short flying period,the ephemeris should be load beforehand for reducing the time to first fix.The custom frame synchronization method needs 6 s in worst condition restricted by the navigation data format of GPS L1 C/A signal.A novel fast frame synchronization method is proposed,in which the pre-loaded ephemeris is used for quick matching with the received bit data.The theoretical analysis and simulation result shows that the mean time of frame synchronization of the proposed method could be reduced by 25%compared with that of custom method.

关 键 词：卫星导航 弹载接收机 快速定位 帧同步 星历匹配 

分 类 号：TN959.2[电子电信—信号与信息处理]