基于相位屏模型研究电离层等效厚度

Equivalent ionospheric thickness based on phase-screen model

相位屏理论已广泛用于星际、行星际和电离层闪烁.考虑背景电离层电子密度沿信号传输路径的不均匀性,根据国际参考电离层提供的背景电离层电子密度高度廓线及其电子总含量,应用多重相位屏模型,设立各层独立参量,数值模拟了全球定位系统信号穿过电离层的闪烁特性.通过与薄相位屏模型数值结果进行对比,寻求适用于薄相屏模型的电离层等效厚度.

The phase screen theory has been used quite extensively in ionospheric scintil- lation work as well as interplanetary and interstellar scintillations. With the electron density variation of background ionosphere along the propagation path of signal taken into account, on the basis of the electron density profile and the total electron content （TEC） of the background ionosphere available from international reference ionosphere （IRI）, the scintillation characteristics of transionospheric Global Position System （GPS） signal are simulated numerically by using multiple phase-screen model with different pa- rameters for each layer. A comparison of the multiple phase-screen results with the thin phase-screen results is made. The emphasis is on the equivalent ionospheric thickness for the thin phase-screen model.