THE EFFECTS OF EQUIVALENT THICKNESS AND DRIFT VELOCITY ON SCINTILLATION POWER SPECTUM IN IONOSPHERIC IRREGULAR STRUCTURE
-
摘要: 利用由衍射基本原理导出的有限厚薄相屏弱闪烁信号强度的Fourier功率谱表达式研究了不规则结构等效厚度L和水平漂移速度V对Fourier功率谱的影响。结果表明,L加大,Fresnel振幅变小,Presnel半径不变;V加大,Fresnel振幅不变,Fresnel半径变大。功率极小值相应的频率值之比为1:1:2:3:…:n而不是√2:√3:…:√n,与实测资料分析结果一致。对实测闪烁功率谱进行了数值模拟。由此得到了实际电离层不规则结构等效厚度、漂移速度的数值。Abstract: By use of the Fourier power expression of scintillation intensity of thin phase screen with limited thickness L, which is derived from principle theory of diffraction, the effects of the equivalent thickness L and the drift velocity V on the Fourier power spectum are studied. The results show that, as L increases, the Fresnel oscillation amplitude decreases and the Fresnel radius remains unchanged; as V increrases, the Fresnel oscillation amplitude remains unchanged and tEe Fresnel radius increases. The ratio of sequent frequences corresponding to the minimum values of poker is 1:2:3:.:n, not √2:√3:…:√n this is in good agreement with the observationa .data. Comparing the computer comulation results of power spectum wih observational data, both the,values of equivalent thickness and me drift velocity of real ionospheric irregular structure are obtained.
-
Key words:
- Drift velocity /
- Equivalent thickness /
- Scintillation power spectum
点击查看大图
计量
- 文章访问数: 1903
- HTML全文浏览量: 65
- PDF下载量: 631
- 被引次数: 0