基于球冠谐分析的区域精密对流层建模

对流层延迟是影响GPS定位精度的主要误差来源。随着精度要求的提高，经验模型已经不能满足精密定位的需要，而世界许多地区建立的连续运行参考站系统为建立区域对流层模型提供了一个很好的契机。本文分析了常用的对流层区域实时模型方法的不足，提出了基于球冠谐 (SCHA, Spherical Cap Harmonic Analysis)的区域精密对流层模型。与常用的四参数模型进行对比分析发现，SCHA模型在内符合精度上有显著提高（RMS值在5mm内），在外符合精度上比传统模型拟合效果提高了50%左右（RMS值在1cm内）。SCHA模型能更好的描述对流层的空间变化，适用于大区域对流层延迟实时建模。

Regional Precise Troposphere Delay Modeling Based on Spherical Cap Harmonic Analysis

The troposphere delay is one of the major error resources for the accuracy of GPS positioning. Empirical models were unable to provide sufficient accuracy for the precise positioning with increasing demand of precision, the Continuously Operating Reference Stations (CORS) built around the world shed lights on constructing more precise tropospheric delay model. Based on the analysis of drawbacks of common real-time regional tropospheric delay models, a new regional real-time troposphere model based on spherical cap harmonic analysis (SCHA) is proposed in this paper. Comparative analysis between SCHA model and four-parameter model show that internally coincident precision of the new model is obvious improved (RMS < 5 mm); its externally coincident precision increases about 50% (RMS < 1 cm). SCHA model could describe special variations of troposphere more reasonably and is adequate to regional real-time troposphere delay modeling for large areas.