电离层行扰的GPS台网监测

A Technique of TID's Detection Using a GPS Array

利用分布在武汉、安陆、荆州三地的全球定位系统(GPS)接收机组成局域GPS台网,监测中国中低纬地区电离层行扰(TID)现象.基于小波变换的多分辨分析特性与Mallat算法,给出了从垂直总电子含量(QVTEC)的时间变化曲线中提取电离层扰动的算法.并通过一个观测实例,说明了利用该方法可以有效地从QVTEC时间变化曲线中去除由卫星运动和电离层日变化等因素引起的日变化趋势,进而提取出短周期的电离层扰动.分析结果表明,本文提出的GPS组网方式和数据处理方法在中国中低纬地区TID监测中具有广阔的应用前景.

The paper presents a method of detecting TIDs(travelling ionospheric disturbances) in central China by setting up a GPS(global positioning system) array composed of three GPS receivers distributed in Wuhan,Anlu and Jingzhou.A way to remove diurnal trends introduced by changes in the satellite position and variations in the regular ionosphere in the measured quantities of vertical (total electron content) based on wavelet multi-scale analysis and Mallat algorithm is proposed for detecting ionospheric disturbances.The technique of TID's detection is also illustrated with an example.