节点文献
精密单点定位中延迟改正模型的研究
【作者】 罗宇文；
【导师】 马大喜；
【作者基本信息】 江西理工大学 ， 测绘工程， 2011， 硕士
【摘要】 随着GPS定位技术的不断发展与进步,其应用领域也越来越广泛,同时要求的精度也越来越高,而目前传统单点定位精度低,差分定位作业成本高、作业效率也渐渐满足不了一些应用领域的需要,因此非差分精密单点定位(Precise Point Positioning,简称PPP)技术在近几年成为GPS研究领域的一个新的热点与难点。非差精密单点定位就是用户使用单台双频GPS接收机采集观测数据,并加入精密星历和精密钟差进行定位解算。其关键技术之一就是对传播信号的延迟误差的消除,由于目前对信号传播的大气层一些特性了解不确定,只能采用传统模型改正。本文就GPS信号传播的延迟误差改正这一问题进行深入研究,通过改进延迟误差的改正模型,从而削弱或消除延迟误差对精密单点定位的影响。本文首先介绍了精密单点定位的基本原理、误差来源和其误差处理的一般方法;分析了延迟误差改正的基本方法和传统模型;利用平均电离层方法改正了电离层延迟,改进Hopfield模型,并与传统延迟改正模型解算结果进行对比分析,结论表明本文延迟改正模型是可行的;为了进一步验证精密单点定位的精度及可行性,另外选取了三组不同区域的观测数据进行验算;运用Visual C++6.0语言编制了解算软件实现数据的解算,使计算过程更方便、快捷。
【Abstract】 With development and progress of GPS Positioning Technology, its application field has been used more and more widely, at the same time the requirement of accuracy is higher and higher, and currently differential positioning operation cost is high, working efficiency also gradually cannot satisfy the need of some areas, the precision of traditional single point positioning is low, so the un-difference Precise Point Positioning (PPP) technology in recent years become a new hotspot and difficulty in the GPS research field. Precise Point Positioning is the user using a single dual-frequency GPS observation data collection, and add the precise ephemeris and precise clock to precise position, the key technology of precise point positioning is to eliminate signal transmission error of the delay. Current characteristics of signal propagation atmosphere is uncertain, only to eliminate by traditional model correction. To solve this problem, this paper has been studied deeply; improve efficiency of delay error correction model, thereby eliminated influence of delay error on the precise point positioning influence.First this paper introduced the basic principle of precise point positioning, the general method of dealing with error, analyzes the error correction of delay basic method and the traditional model, the average ionosphere method has been used to eliminates ionospheric delay, improve Hopfield model, then comparison analysis the results of the traditional delay correction model, obtains the feasibility of the new model. To further verify the accuracy and feasibility of precise point positioning, the paper selected three different regions of the experimental observations. This paper has been used Visual C++6.0 compiling settlement software to realize the calculation process, and the calculating process convenient and quick.