单差模型在处理多路径效应应用中的初步探讨

Preliminary study of using single-differenced model for mitigating multipath errors

差分技术无法消除多路径效应的影响,因此多路径效应成为制约短基线变形监测定位精度提高的主要因素。从观测值残差域分析和提取多路径效应一般基于单差残差,因此需要将双差残差映射为单差残差。本文在分析传统站际单差模型特点的基础上,采用参数重整的方法构建了一种改进的单差模型。实验结果表明,该模型与双差模型是等价的,并且可以直接得到载波相位单差残差,避免了由双差残差向单差残差映射的过程。因此改进的单差模型为多路径效应处理中单差残差的获取提供了一种更好的选择。

Multipath cannot be eliminated by difference technology,so multipath effects has become the bottleneck limiting the positioning accuracy in short baseline deformation monitoring. In general,mitigating multipath errors in residuals domain is based on single-differenced( SD) residuals,which is mapped from double-differenced( DD) residuals. Based on the analysis of the characteristics of the traditional( SD) model, a modified SD model by parameter reforming is discussed in this paper.Experiments show that the modified SD model is equivalent to DD model,and the carrier phase SD residuals can be obtained directly from the modified SD model,so the mapping process from DD to SD residuals is avoided. Hence,the modified SD model is a better choice to calculate SD residuals in mitigating multipath errors.