同时估计电离层延迟的单频精密单点定位方法  

Single-Frequency Precise Point Positioning with Simultaneous Ionospheric Delay Estimation

作　　者：阮仁桂[1] 吴显兵[1] 冯来平[1] 王夕伟[2] 

机构地区：[1]西安测绘研究所 [2]78155部队

出　　处：《测绘学报》2012年第4期490-495,共6页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(141074020);中国卫星导航学术年会资助

摘　　要：提出一种基于单频码和相位观测量的单频精密单点定位方法,将每个观测量的电离层延迟量与接收机钟差、对流层天顶延迟、接收机位置、相位模糊度一起作为未知参数。采用约化参数的平方根信息滤波与平滑算法进行参数解算。该方法适用于实时定位和事后处理,且不需要外部的电离层模型。采用全球分布的32个IGS监测站16 d实测数据进行静态解算试验,结果表明E、N、U方向的RMS分别为0.023 m、0.018 m、0.059 m;基于一组机载GPS数据进行动态解算试验,得到E、N、U方向的RMS(与载波相位动态相对定位结果比较)分别为0.168 m、0.151 m、0.172 m。A new method for single-frequency precise point positioning using code and phase measurement is presented. Ionospheric delay in each code and phase measurement is estimated as unknown parameters together with receiver clock offset, tropospheric zenith path delay, receiver position and ambiguity of carrier phase. Modified square root information filtering ＆ smoothing algorithm with parameter elimination was employed for parameter estimation. The method can be applied to real-time positioning and post processing, and it is independent of any ionospheric model. With the method, static positioning test was carried out with GPSdata collected at 32 stations of the International GNSS Service （IGS） through day 75 to 90 in 2011,which shows RMS in E,N,U are 0.023 m,O. 018 m and0. 059 m respectively. Kinematic experiment with airborne GPS data collected on September 5th 2008 shows that RMS in E,N,U compared with kinematic relative differential solution are O. 168 m, O. 151 m and O. ]_72 m.

关 键 词：单频精密单点定位 电离层 延迟估计 参数约化 平方根信息滤波 平方根信息平滑 

分 类 号：P228[天文地球—大地测量学与测量工程]