题名 | CE-1任务VLBI系统并置简易GPS网自动运行平台搭建以及GNSS网应用研究 |
作者 | 沙凯 |
学位类别 | 硕士 |
答辩日期 | 2008-06-13 |
授予单位 | 中国科学院上海天文台 |
授予地点 | 上海天文台 |
导师 | 平劲松 |
关键词 | GNSS监测网 全球导航定位系统 GAMIT 天顶延迟 地球自转参数 |
中文摘要 | With the constant development of its own technical and significant improvement of its positioning accuracy, GPS has been widely used in multi-disciplinary research and many fields. At present , the global distribution of a large number of GPS stations form a global tracking network and many regional tracking worknets, providing original high-quality GPS observations for educational research and various applications. Application and research in this paper are just based on a GPS regional tracking worknet and IGS global tracking worknet. CE-1 VLBI system is used to track and position CE-1 sattellite, which demands of a correction to tropospheric delay. For a high accuracy need in post positioning mode, we build a GNSS ATMOSPHERE CORRECTION SYSTEM which automatically calculate the ZTD with GAMIT with GPS observations from a regional GPS tracking worknet built for CE-1 VLBI system. In recent years, high-frequency ERP research to improve the existing model and explore unknown high-frequency trigger mechanism become popular , where GPS has been playing a positive and important role for its high-precision positioning and a precise satellite orbit to create hourly ERP time series .So we build a GPS global tracking worknet of 25 IGS fiducial stations normal distributed around the earth, providing GPS observations from 2004-2006 for a 3-hour solution using GAMIT to create a 3-hourly ERP time series .And then a spectrum analysis is run on the residuals of ERP series , which find the obvious semi-diurnal signal. |
英文摘要 | 随着自身技术的不断发展和定位精度的显著提高,GNSS已广泛应用于多学科的研究和多种业务。目前,全球上分布了大量GNSS台站,组成了全球网和许多个区域监测网,可提供高质量广分布连续的原始观测数据。本文的应用研究基于CE-1 VLBI并置的GPS区域监测网搭建中性大气天顶延迟自动解析平台,基于IGS的全球监测网提供的GPS观测数据进行高频地球自转参数(ERP)解算。 CE-1 VLBI测轨分系统的事后精密定轨要求提供高精度的对流层延迟改正,为此,我们在VLBI观测站点并置布设了GPS基准站,组成一个区域GPS监测网。同时在HP工作站LINUX环境下搭建了中性大气修正系统,利用GAMIT软件对此网提供的GPS观测数据和中国境内的IGS站观测数据进行事后的单天解算,每天输出4站ZTD序列结果供测轨分系统使用。 近年来,高频地球自转参数(ERP)的研究成为热点,希望此研究能够对已有模型进行改进,对未知ERP触发机制进行探究。GPS定位精度和卫星轨道精度的提高,使其在ERP解算中起到积极重要的作用。基于此,我们选取了IGS基准站组成全球网,采用IGS事后精密星历,用IERS的ERP最终解作为初值,通过GAMIT实现了ERP序列的3小时解算。通过对结果分析发现解算精度良好,同时验证了ERP残差序列周日半周日项的存在,为下一步的深入研究打下基础。 |
语种 | 中文 |
公开日期 | 2011-07-01 |
页码 | 60 |
内容类型 | 学位论文 |
源URL | [http://119.78.226.72//handle/331011/14714] |
专题 | 上海天文台_中国科学院上海天文台学位论文 |
推荐引用方式 GB/T 7714 | 沙凯. CE-1任务VLBI系统并置简易GPS网自动运行平台搭建以及GNSS网应用研究[D]. 上海天文台. 中国科学院上海天文台. 2008. |
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