电离层中Ba和SF_6复杂释放的电波传播效应研究

Effects of Ba and SF_6 combined releases in the ionosphere on radio wave propagation

单一点源方式的化学物质释放,一般仅能形成较简单的电离层扰动结构,对电磁波的影响频段和影响程度都较为局限,难以对甚高频(Very High Frequency,VHF)以上频段的无线电波产生显著影响.文章提出了一种Ba和SF_6两种不同性质物质组合的复杂释放方法,并利用水平分层介质传播理论,分别以150、400、1 000 MHz三个典型频率为代表,估算了VHF、超高频(Ultrahigh Frequency,UHF)和L频段常用卫星电波信号穿越扰动区后幅度和相位的闪烁情况.仿真结果表明,复杂释放方法产生的电离层扰动结构能够对VHF以上波段信号传播产生显著影响,且信号所受影响随着频率的提高而变弱.

The chemical release experiment by a single point-source can trigger simple ionospheric perturbations,which have an effect on signals of limited frequency and are difficult to influence signals above VHF.Based on complex releases using the combination of Ba and SF_6,a new release approach is presented.The amplitude scintillations and the phase scintillations of VHF,UHF,L bands which are represented by 150 MHz,400MHz and 1 000 MHz signals respectively are calculated with the theory of horizontal stratification when they propagate through the disturbed area.The results show that multi-scales ionospheric disturbance effects induced by this method can influence radio-wave signals above VHF dramatically and the effects decrease with the increasing frequency.