双向相位平滑伪距的硬件延迟解算研究

针对利用GPS观测数据提取TEC过程中最主要的误差来源硬件延迟问题,该文为了获取高精度TEC,在对双频观测数据处理时,改进了基于Hatch滤波的相位平滑伪距算法的使用方法,即双向平滑,取得较好的效果。研究采用了VTEC多项式和球冠谐分析模型来进行区域电离层建模及硬件延迟解算,经比较模型解算的硬件延迟与IGS发布值最大差异不超过1ns,其中VTEC多项式模型解80%差异值小于0.5ns,球冠谐函数模型解所有差异值均小于0.5ns。

Research of calculating the differential code bias based on the bidirectional phase smoothing pseudo-range

Differential code bias(DCB) is the most important sourece of error in extracting TEC from GPS observation data.In order to obtain hight precision TEC,it is very important to solve the differential code bias accurately.In the process of dual frequency data processing,the use of phase smoothing pseudorange algorithm based on Hatch filter was improved,that is,bidirection smoothing,to obtain better results.The research used VTEC polynomials and spherical cap harmonic analysis(SCHA)methodology to model regional ionospheric and solve differential code bias.The results show that the maximum difference is not more than 1 ns compared with the DCB of model calculation and the results of IGS,the 80％ difference value of VTEC polynomial model is less than 0.5 ns,and the all difference value of SCHA model are less than 0.5 ns.