微弱信号下基于模糊度搜索的辅助式GPS定位算法研究An algorithm for Assisted-GPS positioning based on ambiguous search in weak signal environment
宋成,王飞雪,庄钊文
摘要(Abstract):
针对微弱信号下GPS接收机无法测量得到完整信号发射时刻的问题,提出了一种基于模糊度搜索的辅助式GPS定位算法。基于该算法接收机不需要位同步、帧同步和解调导航电文,仅对GPS信号进行伪码相位测量,在获取卫星星历、卫星钟差参数等辅助信息的基础上完成定位解算。论文从数学上严格推导了消除信号发射时刻模糊度的条件,并对五颗以上的观测卫星建立了定位解算方程,给出了算法流程。利用实测数据仿真验证了该算法的有效性。比较表明,该算法的定位精度与常规GPS定位算法(信号发射时刻不存在模糊度)相当。
关键词(KeyWords): 辅助式GPS;微弱信号;定位算法;模糊度
基金项目(Foundation): 新世纪优秀人才支持计划(NCET-04-0995)
作者(Author): 宋成,王飞雪,庄钊文
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