对流层与电离层中电波传播的相关问题研究

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1、摘要本文主要是以随机介质中波传播理论为研究基础，围绕声波干扰对流层散射通信的可行性以及电离层对电波传播的影响进行的相关研究。结合对流层大气中波传播理论和声波原理，讨论了声波干扰对流层散射的特征。在声波干扰前后对流层中折射率起伏研究结果的基础上，计算并讨论了声压、声压级、声波功率的关系以及声波作用下接收场强和接收功率随着入射电波频率及传输距离的变化规律，结果表明声波的频率对接收场强和接收功率影响较大，并给出了声波扰动前后接收功率随入射电波频率及传输距离的计算和比较，这对声波干扰对流层散射通信的应用有重要意义。本文同时基于强度起伏条件下场的四阶矩方程的求解，

2、研究了电离层闪烁指数的情况，并利用IRl2001国际电离层参考模型，给出了中国南极中山站上空的电离层等离子体的相关参数，结合此数据详细讨论了平均到达时间、脉冲展宽随电离层不规则体特征参数的变化情况。关键词；对流层传播声波闪烁指数声压声压级电离层时间特性脉冲展宽AbstractIIIABSTRACTBasedonthetheoryofwavepropagationinrandommedia,thefeasibilityofcontroUingthetroposphericcommunicationbyacousticwaveandionosphericef

3、fectsonradiopropagationhasbeeninvestigatedinthisdissertation．Combinedthetheoryofwavepropagationinturbulentatmospherewimtheprincipleofacousticwave，thecharacteristicofcontrollingthetroposphericcommunicationbyacousticwaveisdiscussed．Onthebasisoftheresearchingworksaboutthefluctuation

4、ofthetroposphericrefractiveindexwith／withoutthedisturbanceoftheacousticwave，therelationshipbetweenthesoundpressure，thesoundpressurelevelandthesoundwavepoweriScalculatedanddiscussed，thereceivedfieldsandthereceivedpowerfordifferentincidentwavefxequencyanddifferenttransmissiondistan

5、cearecalculatedwiththeacousticwavedisturbance，numericalresultsshowthatthefrequencyofacousticwavehasstrongeffectonthereceivedfieldsandthereceivedpower．Inaddition，thecalculationandcomparisonofthereceivedpowerfordifferentincidentwavefrequencyandtransmissiondistancearepresentedwith／w

6、ithoutthedisturbanceoftheacousticwave，whichissignificanttotheuseofcontrollingthetroposphericcommunicationbyacousticwavedisturbance．Meanwhile，accordingtothesolutiontOthefourth—ordermomentequationsundertheconditionsoftheintensityfluctuations，thescintillationindexintheionosphereisst

7、udied，andtheionosphereplasmaparametersinZhongshanStationAreaofAntarcticaskyareobtainedwiththeinternationalreferenceionosphereIRl2001model．Themeanarrivaltime，thepulsebroadeningchangingwiththecharacteristicparametersoftheionosphericirregularitiesarediscussedindetail．KeyWords：Tropos

8、phericPropagation，AcousticWave，Scintilla