电离层不均匀体对短波信号影响的实验研究  

Experiment research on effect of ionospheric irregularities on HF signal

作　　者：凡俊梅[1,2] 马小村[1] 李雪[1] 焦培南[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071 [2]中国电波传播研究所青岛分所,电波环境特性及模化技术国家重点实验室,山东青岛266071

出　　处：《电波科学学报》2008年第3期443-448,454,共7页Chinese Journal of Radio Science

基　　金：国家基础研究项目(6137602002);国家自然科学基金项目(60771049);预先研究项目(513070204)

摘　　要：通过斜向探测设备获取的实验数据,分析Es传播模式和F2层低角模式反射高度处波状扰动情况下,电离层不均匀体对信号幅度、相位、瞬时多普勒频移及FFT频谱信号的影响。试验结果显示,Es层的不均匀体会造成反射信号幅度快速变化,信号相对相位出现扰动;穿过Es层的F2层模式信号没有Es层不均匀体信号的变化特性。小幅度波状变化的F2层反射信号幅度和瞬时多普勒频移有同样周期和同比幅度变化的周期振荡。FFT频谱分析显示,Es层不均匀体会造成信号频谱的扩展;而F2层波状扰动周期在积累时间内没有较大变化时,频域信号有多个离散的频谱,当扰动周期有明显变化时,频域信号是一个连续的扩展频谱。By utilizing observation data of an oblique detector, the effect of ionospheric irregularities on HF signal including signal amplitude, relative phase, simultaneous doppler shift and the FFT spectrum is analyzed in this paper. It can be concluded that Es irregularities will lead the reflected signal amplitude fading rapidly and the relative phase exhibiting a corresponding undulation, and F2 propagation mode signal is out of effect by Es irregularities. For the reflected signal from F2-region, the amplitude and simultaneous doppler shift of signal oscillate periodically with the same periods and same changing swing relation with time. Using the FFT spectrum-analysis technique, it is found that the spectrum of signal reflected from Es irregularities is expanded, and when the disturbing period of the signal reflected from F2-region keeps constant in accumulation time, the singal in frequency domain is consist of dispersed ones, and when the period changes, the signal spectrum is a continuous expended ones.

关 键 词：电离层 不均匀体 行波扰动 

分 类 号：TN011.2[电子电信—物理电子学]