基于原始观测值的单频精密单点定位算法  

A Kind of Single-frequency Precise Point Positioning Algorithm Based on the Raw Observations

作　　者：王利[1,2] 张勤[1,2] 涂锐 刘站科[4,5] 

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [3]德国波茨坦地学中心,德国波茨坦14469 [4]武汉大学测绘学院,湖北武汉430079 [5]国家测绘地理信息局第一大地测量队,陕西西安710054

出　　处：《测绘学报》2015年第1期19-25,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(40902081;41104019;41274005;41202189);国土资源大调查项目(1212011220186;1212011220142;12120114079101);中央高校基本科研业务费专项(2013G2263003;2013G3264003;2013G3264004)~~

摘　　要：研究了一种基于GPS原始观测值的单频PPP算法.该算法通过增加电离层延迟先验信息、空间和时间约束的虚拟观测方程,将电离层延迟当作未知参数与其他定位参数一并进行估计来高效修正电离层延迟误差.通过使用全球178个IGS站1d的实测数据对本算法的收敛速度、定位精度和电离层VTEC 的精度进行检验与分析.结果表明,该算法的收敛速度和稳定性均得到了改善,其静态单频单天PPP解的精度可达2-3cm、模拟动态单频单天PPP解的精度可达2-3dm,并且单频PPP与双频PPP提取的电离层总电子含量平均偏差小于5个TECU,可作为一种附属定位产品使用.A kind of single‐frequency precise point positioning (PPP) algorithm based on the raw observa‐tions is presented in this paper .By this algorithm ,the ionospheric delays were corrected efficiently by means of adding the ionospheric delay prior information and the virtual observation equations with the spati al and temporal constraints ,and they were estimated as the unknown parameters simultaneously with other positioning parameters .Then ,a dataset of 178 International GNSS Service (IGS) stations at day 72 in 2012 was used to evaluate the convergence speed , the positioning accuracy and the accuracy of the retrieved ionospheric VTEC .The series of results have shown that the convergence speed and stability of the new algorithm are much better than the traditional PPP algorithm ,and the positioning accuracy of about 2‐3 cm and 2‐3 dm can be achieved respectively for static and kinematic positioning with the single‐frequency observations’ daily solution .The average bias of ionospheric total electron content retrieved by the single‐frequency PPP and dual‐frequency PPP is less than 5 TECU .So the ionospheric total electron content can be used as a kind of auxili ary products in GPS positioning .

关 键 词：单频精密单点定位 原始观测值 电离层延迟 虚拟观测方程 

分 类 号：P228[天文地球—大地测量学与测量工程]