一种卫星数量不足情况下的GPS定位算法  

A GPS positioning algorithm in condition of insufficient satellites

作　　者：刘志锋 张鹏[2,3] 商曼[4] 

机构地区：[1]广州地铁设计研究院有限公司,广州510010 [2]武汉大学测绘学院,武汉430079 [3]精密工程与工业测量国家测绘地理信息局重点实验室,武汉430079 [4]广州市房地产测绘院,广州510010

出　　处：《导航定位学报》2017年第4期10-15,共6页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41374011;41474005);湖北省自然科学基金项目(2014CFB717)

摘　　要：针对GPS卫星定位时由于障碍物遮挡等原因只能接收到少于4颗卫星的信号而导致定位精度不高的问题,提出一种卫星数量不足情况下的基于"合成孔径技术"的GPS定位算法:利用载波相位平滑伪距、电子罗盘辅助低精度IMU实现初始对准和航迹推算等方法,结合合成孔径技术实现定位。实验结果表明,该方法可以实现卫星信号数量不足情况下的定位,精度在20m左右。Aiming at the problem that the accuracy is liable to be lower due to the signal received from less than 4satellites by obstacle blocking in GPS positioning,the paper proposed a GPS positioning algorithm in the condition of insufficient satellite number based on the synthetic aperture technology:carrier-phase smoothing technology,electronic compass aided low-precision IMU initial alignment and dead reckoning were used,and synthetic aperture algorithm was combined to do the positioning.Experimental result showed that the proposed method could help achieve the positioning by insufficient satelllites with an accuracy around 20 m.

关 键 词：惯导 卫星数量不足 GPS定位 合成孔径 

分 类 号：P228[天文地球—大地测量学与测量工程]