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 L1C/ 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.

TN959. 2

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(18A51