多模多尺度PPP-RTK地基增强信息快速实时生成和无缝衔接方法研究

项目名称： 多模多尺度PPP-RTK地基增强信息快速实时生成和无缝衔接方法研究

项目编号： No.41304028

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 邹璇

作者单位： 武汉大学

项目金额： 25万元

中文摘要： 精密单点定位（PPP）是高精度卫星定位的主要技术手段，模糊度快速固定则是PPP技术进一步推广应用的难点问题。本项目重点研究多模多尺度PPP-RTK地基增强信息快速实时生成和无缝衔接方法。拟通过弱化测站天顶对流层延迟残余误差影响，加快广域PPP-RTK用户模糊度首次收敛速度；通过将基准站间双差模糊度映射为非差模糊度的形式，设计适合我国北斗系统的区域地基增强PPP-RTK误差改正信息实时建模方法；通过建立基于随机过程的多模系统误差估计方法以及基于赫尔默特方差分量估计的多模观测值随机模型，研究GPS/北斗融合的区域地基增强PPP-RTK用户模糊度单历元确定方法；充分利用由前一种服务模式获得的先验信息，实现不同尺度PPP-RTK以及它们与常规PPP服务间用户定位结果的无缝衔接。项目的研究内容将促进我国北斗系统在全球范围内的推广与应用，为将来建立统一且无缝衔接的全球多模PPP服务模式提供理论依据。

中文关键词： 多尺度PPP-RTK；模糊度快速收敛；区域增强；无缝衔接；大规模数据处理

英文摘要： Precise point positioning (PPP) is a technology of high-precision satellite positioning, while fast ambiguity resolution is the key problem of its wider applications. This project aims at the theory and method of fast real-time modeling and seamless connection of the multi-scale PPP-RTK ground-based augmentation information for multi-GNSS. The key issues for this project are as follows: speeding up the ambiguity resolution of wide-area PPP-RTK user by weakening the influence of residual tropospheric delay; modeling the regional PPP-RTK augmentation information for Beidou by mapping the double-differenced ambiguities among reference stations into undifferenced ambiguities; realizing single-epoch ambiguity resolution of GPS/Beidou combined regional PPP-RTK by removing system errors using stochastic process and determining stochastic model using Helmert variance component estimation; seamless connection between each PPP service modes by making full use of the prior information obtained by the former service mode. To sum up, the researches will facilitate the worldwide popularization and application of Beidou, and will provide new ideas for the establishment of global multi-GNSS PPP system with seamless service.

英文关键词： Multi-scale PPP-RTK；Rapid ambiguity convergence；Regional augmentation；Seamless transition；Large-scale data processing