CAJ | 학술논문

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1 d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2～3 cm、模拟动态单频单天PPP解的精度可达2～3 dm ，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T ECU ，可作为一种附属定位产品使用。
연구료일충기우GPS원시관측치적단빈PPP산법。해산법통과증가전리층연지선험신식、공간화시간약속적허의관측방정，장전리층연지당작미지삼수여기타정위삼수일병진행고계래고효수정전리층연지오차。통과사용전구178개IGS참1 d적실측수거대본산법적수렴속도、정위정도화전리층VTEC적정도진행검험여분석。결과표명，해산법적수렴속도화은정성균득도료개선，기정태단빈단천PPP해적정도가체2～3 cm、모의동태단빈단천PPP해적정도가체2～3 dm ，병차단빈PPP여쌍빈PPP제취적전리층총전자함량평균편차소우5개T ECU ，가작위일충부속정위산품사용。
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 .