长三角地区电离层变化的GPS监测

摘要

Dual frequency GPS observation can be used to monitor ionospheric Total Electron Content (TEC) distribution and variation above a region. From the distributive variations of the obtained Ionospheric TEC , ionospheric irregularities of different scales can be investigated. This paper attempts to study the variations and actions (activities)of the ionospheric TEC above Yangtze Delta by using.a span of one-year series of absolute TEC , which is obtained from Shanghai Comprehensive GPS Application Network (SCGAN) in 2004. From the TEC data, the diurnal, seasonal, annual variations of ionosphere above Yangtze Delta region were analyzed and discussed. Meanwhile, by using several kinds of data processing methods, such as Gauss weight function and running smoothing, the parts of the major trend has been separated from the high frequency changing series. These rndata can be used for qualitative research of relative variations of ionospheric TEC, so as to reveal the small scale and medium scale ionospheric disturbances.%利用GPS双频观测量可获取电离层总电子含量(Total Electron Content,TEC),以监测区域上空电离层的分布和变化特征,从而可以发现不同尺度的电离层异常.该文采用2004年上海地区GPS综合应用网(SCGAN)以及中国地壳运动监测网络(CMONC)的部分台站的观测,计算得到1年时间序列的TEC数据,来研究长三角地区上空的电离层TEC的变化与活动.应用这些数据,综合利用高斯权函数和滑动平均等几种数据处理方法,重点分析和讨论了长三角地区上空电离层的周日变化、周年变化和季节性变化特性,揭示了电离层冬季异常等现象.同时,通过对1年时间序列TEC进行谱分析,得到了其相应的变化周期.