非单一电离层扰动场的台阵探测分析

AN ANALYSIS METHOD OF NONUNIFORM IONOSPHERIC DISTURBANCES FROM ARRAY OBSERVATION

真实的ＴＩＤ一类大尺度电离层扰动是非平稳和色散的，而且是统计非单一的．本文首先给出了描述这种真实扰动场的数学模型，进而导出了联系台阵探测可测量与扰动场传播参量的观测方程，在此基础上提出了求解观测方程的时频分析方法．这一台阵探测数据分析的新方法，既能分离出非单一电离层扰动场中各种准单一扰动成分，又能获得准单一扰动成分传播参量随时间的演变和随频率的色散．分析实例表明，本文方法分辨率好，精度高，结果可靠，是适用于ＴＩＤ一类大尺度电离层扰动台阵探测数据分析的有效方法．

Large scale ionospheric disturbances such as TIDs are generally unstationary,dispersive,and nonuniform.Firstly,this paper gives the observation equations relating observable quantities of array observation with propagating parameters of disturbance field.Then,the time-frequency analysis method for the observation equations is introduced.This newly developed method can both differentiate various quasi-uniform components from nonuniform ionospheric disturbances,and obtain the evolution of propagating parameters of quasi-uniform components versus time as well as dispersion versus frequency.Instance Analysis shows that this method,with fine resolution,high precision,and reliable result,is effective on array observation analysis of large scale ionospheric disturbances.