电磁脉冲信号电离层传播的时间特性

发布时间：2018-11-16 13:50

【摘要】：研究背景电离层以及分布于其中的电子密度不规则性结构的变化,对穿越于其中电磁脉冲信号的传播时间产生的影响.基于积分方程迭代法得到的时间矩和双频、双点互相干函数的解析解,从理论分析和数值模拟,探讨电磁脉冲信号穿过电离层随机介质传播的时延特性,并基于极区背景电离层参数,模拟分析脉冲信号的附加时延随电离层电子密度不规则体谱指数,内、外尺度以及电子密度起伏方差等的变化.理论和数值模拟表明,电离层脉冲信号传播的时延取决于背景电离层以及相应的群速传播项的影响,而电离层不规则体的色散、散射作用对电磁脉冲信号附加时延的影响相对较小,两者在数量级上相差数十倍.
[Abstract]:The influence of the variation of the irregular structure of the ionosphere and the electron density in the ionosphere on the propagation time of the electromagnetic pulse signal passing through the ionosphere is studied. Based on the analytical solution of time moment, double frequency and double point function obtained by iterative method of integral equation, the time delay characteristics of electromagnetic pulse signal propagating through the ionospheric random medium are discussed from theoretical analysis and numerical simulation. Based on the polar background ionospheric parameters, the variation of the additional delay of the pulse signal with the irregular spectral index, internal and external scales of the ionospheric electron density and the variance of the electron density fluctuation are simulated and analyzed. Theoretical and numerical simulations show that the delay of ionospheric pulse signal propagation depends on the influence of the background ionosphere and the corresponding group velocity propagation term, and the dispersion of the ionospheric irregular body. The effect of scattering on the additional delay of electromagnetic pulse signal is relatively small, and the difference between them is tens of times in order of magnitude.
【作者单位】：西安工程大学应用技术学院;西安工程大学理学院;
【基金】：陕西省教育厅专项科研基金资助项目(2014JK1295) 西安工程大学博士科研启动基金资助项目(BS1418)
【分类号】：TN011.2

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