IGS服务数据的智能获取与工程应用

发布时间：2018-01-24 02:53

本文关键词： GNSS IGS数据广播星历精密星历 ITRF框架精度分析　出处：《东南大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着GNSS的发展,国际GNSS服务(IGS)也在与时俱进。从1994年开始,IGS便向全球范围内的研究机构和个人提供高质量的数据和产品服务,用于支持各种科学研究、教育服务以及多学科的综合应用等方面。目前,在全球范围内,已经有许多研究机构和GNSS个体用户利用IGS发布的数据和产品来进行科学研究和精密定位。本文首先介绍了精密单点定位的数学模型和主要误差来源,然后介绍了 IGS发布的数据和产品的使用及研究现状,概述了 IGS服务机构的由来、发展和运行机制,系统地对IGS数据中心的各类数据和产品进行了说明,最后编制软件实现对IGS数据的智能获取,并且对获取的数据进行深入的处理和分析。具体的研究内容和结果如下:(1)完成IGS服务数据智能获取软件开发。在对IGS发布的数据和产品进行分析与了解的基础上,依据面向对象分析与设计的思维,结合模块化的程序思想,基于VS2013平台,采用C++编程语言,设计开发MFC应用程序,实现对IGS服务数据的智能获取软件的开发,并且建立相应的数据库,满足数据的存储和管理功能。(2)利用数理统计方法,分析广播星历所能达到的精度指标。结果表明:GPSBlock-IIF卫星和Block-IIRM卫星的轨道精度相当且都明显优于Block-IIR卫星;三种型号卫星上搭载的卫星钟,其钟差精度也基本相当,整体精度优于6ns,但在短期稳定性能上,铷钟比铯钟更优。(3)建立IGU精密实时轨道数据预推误差模型,得到预推时间与预推轨道误差值的近似函数关系式。针对IGS不同分析中心卫星轨道产品之间的差异,采用七参数转换模型计算不同分析中心坐标转换的参数,消除产品间的系统性偏差,比较分析不同分析中心产品的精度,结果表明:ESA、GFZ产品的精度较好,可以自行综合ESA、GFZ数据产品来替代IGS发布的最终数据产品。(4)将IGS服务数据和产品用于精密单点定位,分析不同卫星系统的数据对精密单点定位精度的影响以及不同分析中心的数据和产品对精密单点定位精度的影响。通过ITRF框架转换算例来验证框架转换的可行性。
[Abstract]:With the development of GNSS, the international GNSS service is also advancing with the times. IGS provides high-quality data and product services to research institutions and individuals around the world to support a variety of scientific research, educational services and multidisciplinary applications. On a global scale. There have been many research institutions and individual GNSS users using the data and products released by IGS to carry out scientific research and precise positioning. Firstly, this paper introduces the mathematical model and main error sources of precise single point positioning. Then it introduces the use and research status of data and products released by IGS, and summarizes the origin, development and operation mechanism of IGS service organization. All kinds of data and products of IGS data center are explained systematically. Finally, the software is developed to realize the intelligent acquisition of IGS data. And the obtained data in-depth processing and analysis. Specific research content and results are as follows: 1). To complete the development of IGS service data intelligent acquisition software. On the basis of the analysis and understanding of the data and products released by IGS. According to the thinking of object-oriented analysis and design, combined with modular program idea, based on VS2013 platform, C programming language is used to design and develop MFC application program. To realize the development of intelligent acquisition software for IGS service data, and to establish the corresponding database to meet the data storage and management function. The accuracy index of broadcast ephemeris is analyzed. The results show that:. The orbit accuracy of GPSBlock-IIF satellite and Block-IIRM satellite is the same and obviously superior to that of Block-IIR satellite. The clock on the three types of satellites is similar in accuracy, the overall accuracy is better than 6ns, but in the short-term stability performance. Rubidium clock is better than cesium clock.) the IGU precision real-time orbit data prepush error model is established. The approximate functional relationship between the pre-push time and the error value of the pre-push orbit is obtained. The differences between the central satellite orbit products and the IGS are analyzed. The seven parameter transformation model is used to calculate the parameters of coordinate transformation between different analytical centers, to eliminate the systematic deviation between products, and to compare and analyze the accuracy of different analysis centers. The results show that the results are as follows: (1) ESA. The precision of GFZ products is good, we can use IGS service data and products for precise single point positioning instead of final data products released by IGS. The influence of data from different satellite systems on precision single point positioning accuracy and the influence of data and products from different analysis centers on precision single point positioning accuracy are analyzed. An example of ITRF frame conversion is used to verify the accuracy of frame conversion. Feasibility.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P228.4

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