局域观测网高精度电离层延迟估计和应用

High-Accuracy Ionospheric Delay Estimation and Application Based on Regional Observation Network

针对用户对高精度电离层延迟产品的迫切需求,研究了基于局域参考站网络进行高精度电离层延迟的估计和内插方法,分析讨论了应用获取的电离层延迟进行单频单站数据处理的精度。结果表明,通过局域参考站观测可以实现优于7 cm的高精度电离层延迟服务。采用高精度的电离层延迟产品,单频单站用户2 h静态观测在N、E和U这3个方向的精度可分别达到3.5、5.5和8.6 cm。动态定位结果表明,受电离层延迟内插结果与解算模式影响,模糊度参数收敛速度较慢,但收敛之后,N、E和U这3个方向的均方根可分别达到3.1、5.2和7.0 cm。研究成果可为高精度电离层延迟的解算与产品服务提供理论依据与技术保障,并为单频单站用户在导航定位中的应用提供参考。

Aiming at the requirements and services of high-accuracy ionospheric delays,the estimation and interpolation methods of high-accuracy ionospheric delays based on a local reference station network is studied in this paper.The performance and accuracy of single-frequency single point positioning are analyzed by using the interpolated ionospheric delays.The results show that the observation of the local reference station can achieve a high precision ionospheric delay service which reaches better than 7 cm.Using high-precision ionospheric delay products,the accuracy of single-frequency single-station users in two-hour static observations can reach 3.5,5.5,and 8.6 cm in the directions of N,E,and U respectively.The dynamic positioning results show that the ambiguity parameter converges slowly due to the ionospheric delay interpolation results and the solution mode.But after the ambiguity converges,the root mean square(RMS)of the three directions of N,E,and U can reach 3.1,5.2 and 7.0 cm respectively.This research results can provide theoretical basis and technical support for the calculation and product service of high-precision ionospheric delay,and provide a reference for single frequency and single station users in navigation and positioning applications.