基于拟合推估的中国区域电离层延迟精确建模方法  

Precise Modeling of Ionospheric Delay over China Region Based on Collocation

作　　者：袁运斌[1,2] 李子申[1,3] 王宁波[1,2,4] 张宝成[1,5] 霍星亮[1,2] 

机构地区：[1]中国科学院测量与地球物理研究所,武汉430077 [2]大地测量与地球动力学国家重点实验室,武汉430077 [3]中国科学院光电研究院,北京100094 [4]中国科学院大学,北京100049 [5]澳大利亚科廷大学

出　　处：《导航定位学报》2015年第3期49-55,共7页Journal of Navigation and Positioning

基　　金：973项目(2012CB25604);国家自然科学基金(41231064;41304034;41204031;41321063);中国科学院交叉创新团队(KZZD-EW-TZ-05);北京市自然科学基金(4144094);国际GNSS监测评估系统(IGMAS)分析中心建设与运行维护项目;大地测量与地球动力学国家重点实验室开放基金(SKLGED2014-3-1-E)

摘　　要：高精度的格网电离层是广域增强系统建设和应用的重要信息之一,针对我国区域电离层复杂多变的特点,本文将电离层延迟变化分为趋势项和随机项两部分,推导了利用拟合推估原理进行中国区域电离层延迟建模的基本方法;在此基础上,利用电离层活动高年、中年和低年的观测数据对方法的精度进行了详细评估.试验结果表明：基于拟合推估的电离层延迟建模方法的修正精度在电离层活动高年约为0.4～0.7 m,在电离层活动低年约为0.2 m;对于我国中纬度地区,基准站间距可适当放大至800km 左右,而在我国低纬度地区基准站间距应保持在350～450km 之间.Grid-based ionospheric information with high accuracy is crucial to the Wide Area Augmentation System (WAAS)establishment and operation.With the specialty and complexity of the ionospheric conditions over China region,an approach is proposed to model the Chinese regional ionosphere using collocation after splitting the ionospheric delays into a de-terministic trend together with a stochastic component.The usefulness of the method is validated with GPS measurements col-lected during high-,medium-and low-solar activities over China.It follows from our analyses that,the accuracy of our method resides within 0.4-0.7 m during high-solar activity year,whereas it is reduced to approximately 0.2 m during low-solar activity year.Considering the mid-latitude area of China,the distance between reference stations can maintain about 800 km.For the low-latitude area,however,such a distance should be limited between 350 km and 450 km.

关 键 词：电离层延迟 全球导航卫星系统 拟合推估 北斗广域增强系统 

分 类 号：P228[天文地球—大地测量学与测量工程]