基于GPS技术实时监测2009年7月22日日全食期间长三角区域电离层TEC变化  

Real-time monitoring of ionosphere changes in the Yangtze River Delta region based on GPS technology during the total solar eclipse of 22 July 2009

作　　者：王虎[1] 王解先[1,2] 白贵霞[2,3] 王潜心[4] 李浩军[1] 朱卫东[1] 

机构地区：[1]同济大学测量与国土信息工程系,上海200092 [2]现代工程测量国家测绘局重点实验室,上海200092 [3]陕西测绘局,西安710054 [4]中南大学信息物理工程学院,长沙410083

出　　处：《地球物理学报》2011年第7期1718-1726,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目“GNSS实时精密单点定位的若干问题的研究”(40974018);中国地震局陆态网络工程资助项目(CMONOCⅡRJ-2008-005);上海市科学技术委员会资助项目(06DZ22101)资助

摘　　要：2009年7月22日上午发生的日全食是21世纪持续时间最长的日全食,其全食带覆盖了中国中部的长江流域,为研究日全食对电离层的影响提供了一次难得的机会.为此本文通过卡尔曼滤波算法实现了实时求解TEC和GPS系统硬件延迟,为实时监测日全食期间电离层变化提供了绝对的电离层TEC.采用上海和浙江区域内GPS网的观测数据,建立了实时区域电离层延迟模型,进而计算出了实时的VTEC和TEC变化率.同时考虑太阳和地磁活动参数,综合上述方法详细分析和讨论了长三角区域在此次日全食期间的TEC变化的电离层异常现象.The longest total solar eclipse during the 21st century occurred in the morning of 22 July 2009. The Yangtze River Valley of Central China is located on the central line of the total eclipse belt. It will provide a unique opportunity to investigate the influence of the total solar eclipse on the ionosphere. This paper describes a method of real-time solving TEC and GPSinstrumental bias using Kalman filtering, so this can be used to provide absolute amount of ionospheric TEC for real-time monitoring of ionosphere changes during the total solar eclipse. For validation of this method, the data of Shanghai and Zhejiang regional GPS network are used and a real-time regional ionosphere model is created,then real-time VTEC and TEC ratio are also calculated. Meanwhile, with consideration of the solar and geomagnetic parameter, the ionospheric anomalies with phenomenon of TEC changes in the Yangtze River Delta region during the total solar eclipse are analyzed in detail and discussed by adopting the numerical computations.

关 键 词：日全食 电离层 TEC VTEC GPS 卡尔曼滤波 GPS系统硬件延迟 

分 类 号：P228[天文地球—大地测量学与测量工程] P352[天文地球—测绘科学与技术]