摘要
单频PPP存在无法组合多频点观测值来消除电离层误差的问题。为了分析并改正单频电离层延迟,将实测数据和仿真得到的包含预设电离层延迟的GPS双频观测值,分别基于单频非组合、双频非组合模型进行PPP解算。对比分析发现,电离层延迟对单频PPP定位性能有较大影响,没有电离层影响的单频PPP定位性能与双频PPP相当。然后采用3种常用约束策略(常数约束、时空约束和逐步松弛约束)对实测数据进行PPP解算实验。实验结果表明,附加电离层约束能够显著缩短单频PPP收敛时间,但距离双频PPP仍有一定差距。
Single-frequency PPP cannot combine multi-frequency observations to eliminate ionospheric delay.In order to analyze and correct the single-frequency ionospheric delay,the measured data and the GPS dual-frequency observations with preset ionospheric delay obtained by simulation,are calculated based on the single-frequency uncombined PPP model and dual-frequency uncombined PPP model respectively.The comparative analysis shows that the ionospheric delay has great impact on the positioning performance of single-frequency PPP.The positioning performance of single-frequency PPP without ionospheric influence is comparable to that of dual-frequency PPP.Then three common constraint strategies including constant constraint,spatial-temporal constraint and stepwise-relaxed constraint are used to perform PPP solving experiments on the measured data.The experimental results show that the additional ionospheric constraints can significantly shorten the convergence time of single-frequency PPP,but there is still a certain gap from the dual-frequency PPP.
作者
邱瑞瑾
冯哲煜
陈晨
景鑫
李建文
QIU Ruijin;FENG Zheyu;CHEN Chen;JING Xin;LI Jianwen(Publishing House of FElectronics Industry,Beijing 100036,China;Iyomation Engineering University,Zhengzhou 450001,China;61932 Topp,Beijing 100072,China;61363 Troops,Xi'an 710054,China)
出处
《测绘科学技术学报》
2025年第1期8-14,共7页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(42174036)。
关键词
非差非组合PPP
单频
电离层约束
定位性能
Bernese软件
undifferenced and uncombined PPP
single frequency
ionosphere constraint
positioning performance
Bernese software
