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题名	利用地基GPS网研究和监测电离层总电子含量及应用
作者	田言涛
学位类别	硕士
答辩日期	2007-06-20
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	王小亚
关键词	地基GPS网 电离层 总电子含量（TEC） 磁暴
其他题名	Results and Its Applications of Studying and Monitoring Ionospheric Total Electron Content Based on Ground GPS Network
中文摘要	By means of GPS technique, a 0.5 hours by 0.1 degrees by 0.1 degrees (time by longitude by latitude) grid module of ionosphere has been established for real time monitoring precise ionospheric vertical total electron content (TEC) over the area of Shanghai Comprehensive GPS Application Network (SCGAN). In every 30 minutes, one TEC map which shows the detailed distribution of TEC over this area is acquired and used for real-time correction to ionosphere delay of GPS receiver with single frequency. Based on this module, two-year TEC time series of ionosphere over Shanghai is extracted from the observation data of SCGAN. The analyses of the TEC time series show that the some characters of TEC over Shanghai are similar to other areas in middle latitude district, and some are different for the local environment of Shanghai. Furthermore, the time sequences of TEC and TEC rate with sample spacing of 1 minute during all big geo-magnetic storms since the year of 2003 have been obtained together with TEC maps which used for demonstration of TEC distribution over SCGAN of each half an hour during geo-magnetic storms. The results show that both of the TEC value and rate are anomalous during geo-magnetic storms, and the amplitude of such anomaly in daytime is larger than in nighttime. TEC distribution is characterized by the fact that TEC values in the south part of SCGAN are larger than the north part especially during daytime. It is also shown that the TEC value increases during nighttime and then quickly decreases to normal value.
英文摘要	本文利用地基GPS网的观测资料建立了区域高分辨率的实时电离层总电子含量（TEC）格网模型，基于这一模型可以实时监测TEC变化与实时改正网内单频GPS接收机的电离层延迟。实际数据分析表明，该模型详细反映了GPS网上空TEC的空间分布特征与变化特点，可比IGS提供的GIM以及IRI等模型更为有效地改正单频GPS接收机电离层延迟。此外，基于这一模型分析了上海综合GPS应用网（SCGAN）的历史资料，得到了SCGAN上空平均TEC的取样间隔为1分钟的连续时间序列和间隔为30分钟的TEC区域分布序列。在这些数据的基础上，着重研究了SCGAN范围内特别是上海地区上空的TEC时间变化特征与区域分布特点和SCGAN范围内TEC对磁暴的响应情况。结果显示，该地区的TEC既有电离层活动的普遍特征又有与局部环境有关的区域特性；磁暴期间，TEC值和TEC变化率均出现了一定程度的异常，区域分布呈现出南高北低的趋势，在白天这种特征更加显著；另外，磁暴期间的TEC在夜间到次日凌晨期间有一次大范围区域的上升，又于清晨逐渐回落到正常值。这些结果对于进一步了解SCGAN范围内电离层活动规律、电离层与日地活动及空间环境的关系、网内单频GPS接收机电离层延迟的有效改正等均有一定的积极意义。
语种	中文
公开日期	2011-07-01
页码	92
内容类型	学位论文
源URL	[http://119.78.226.72//handle/331011/14668]
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	田言涛. 利用地基GPS网研究和监测电离层总电子含量及应用[D]. 上海天文台. 中国科学院上海天文台. 2007.

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