三颗星的AGPS定位算法与实现  

Three Satellites Positioning Algorithm Based on AGPS Structure and Realization

作　　者：李吉忠 武穆清[2] 

机构地区：[1]青岛农业大学理学与信息科学学院,山东青岛266109 [2]北京邮电大学信息与通信工程学院,北京海淀区100876

出　　处：《电子科技大学学报》2010年第3期372-375,424,共5页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(60772109)

摘　　要：为了在弱信号情况下更有效地实现定位,对辅助全球定位系统(AGPS)中三颗星定位算法进行了研究。采用AGPS定位系统结构改善接收机捕获性能,AGPS系统通过通用无线分组业务(GPRS)服务提供定位辅助数据;当接收机只能捕获三颗卫星信号时,利用边界模糊处理技术进行伪距处理,构成3个方程,附加地球椭球方程,采用Gauss-Newton算法对方程组进行位置解算.最后根据实测数据分析初始高度不同时的位置解算结果,当高度差为10 m时,平均水平定位偏差小于16 m.算法运算量相当于传统定位算法的2/5。A positioning algorithm based on three satellites is studied in assisted global positioning system（AGPS） in order to realize positioning efficiently in weak signal.AGPS positioning system structure is introduced to improve the performance of receiver and the system provides auxiliary data through general packet radio service（GPRS）.When only three satellites are captured,pseudo-range is disposed using fuzzy border disposal technology.The position is located through solving a group of equations with Gauss-Newton algorithm.At last,the positioning result based on different height is analyzed according to real measured data.The mean horizontal positioning bias is less 16 m when the bias of height is 10 m.

关 键 词：辅助全球定位系统 运算量 全球定位系统 导航 定位精度 

分 类 号：V249.31[航空宇航科学与技术—飞行器设计]