GPS广域增强系统电离层延迟网格修正算法的研究

A Study on the Grid-based Algorithms for the Ionospheric Delay Correction in a GPS Wide-Area Augmentation System(WAAS)

建立一种广域增强系统地面监测网对电离层延迟的观测数据生成网格修正值算法，并在天津、长春、西安三地通过用双频接收机同时采集的电离层延迟实测数据，对广域增强系统的电离层网格修正法的修正精度进行验证，并与一般用户目前采用的Ｋｌｏｂｕｃｈａｒ模型修正法进行了比较。结果表明，电离层延迟网格修正法的修正精度普遍大于８０％，优于Ｋｌｏｂｕｃｈａｒ模型修正法，是一种精度较高的电离层实时修正法。

The purpose of this paper is to evaluate the performance of the grid-based algorithms by a sample network with the raw data recorded by the dual-frequency GPS receiver siting at Tianjin,Changchun and Xi’an In comparison with the algorithms of Klobuchar model the results show that the grid-based ionospheric algorithms can correct ionospheric delay in real-time with its precision higher than 80%,exceeding the algorithms of Klobuchar model