非相干散射信号谱的非平均模型
Towards a model of incoherent scatter signal spectra without averaging over sounding runs
摘要：
本文提供了一个非相干散射信号谱模型，而不需要对接收信号进行平均。该模型基于介质介电常数不规则性对无线电波的单次散射理论和等离子体热不规则性的动力学理论。所提出的模型是针对单站测深的情况而得到的。该模型表明，接收信号的主要贡献是由离子数相密度的某些空间谐波引起的离子声波。该模型通过介质的宏观特性解释了信号谱的宽度和形式，并通过离子数相密度的特性解释了其精细的峰状结构。引入重量体积的概念来定义在对散射信号的形成做出主要贡献的离子数相密度的空间谱中的波矢量和速度的域。这个重量取决于天线方向图、探测信号的形式、频谱处理的时间窗口以及电离层等离子体宏观参数：电子和离子温度、离子组成和漂移速度。在附加离子数相密度假设的前提下，利用伊尔库茨克非相干散射雷达数据对模型进行了检验。试验结果表明，该模型与试验结果吻合较好.
英文摘要：
This paper offers a model for incoherent scatter signal spectra without averaging the received signal over sounding runs (realizations). The model is based on the existent theory of radio waves single scattering from the medium dielectric permittivity irregularities, and on the existing kinetic theory of the plasma thermal irregularities. The proposed model is obtained for the case of monostatic sounding. The model shows that the main contribution to the received signal is made by ion-acoustic waves caused by certain spatial harmonics of the ions number phase density. The model explains the width and form of the signal spectrum by macroscopic characteristics of the medium, and its fine 'peaked' structure by characteristics of the ions number phase density. The notion of the weight volume is introduced to define the domain of wave vectors and velocities in the spatial spectrum of the ions number phase density which makes the main contribution to the formation of the scattered signal. This weight volume depends on the antenna pattern, the form of the sounding signal, and on the time window of spectral processing, as well as on ionospheric plasma macroscopic parameters: electron and ion temperatures, ion composition, and the drift velocity. Within the context of additional assumption about the ions number phase density, the proposed model was tested by the data from the Irkutsk incoherent scatter radar. The test showed a good fit of the model to experiment.
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