光束在强湍流区中传播的到达角起伏

Angle-of-arrival fluctuation of light beam propagation in strong turbulence regime

基于修正Rytov理论,导出了适用于强湍流区的无限平面波和球面波的到达角起伏方差表达式及其功率谱表达式,分析了散射盘对到达角起伏的影响。研究结果表明:导出的方差表达式在弱湍流区也适用,随着Rytov方差的增加到达角起伏趋于饱和;高频功率谱的下降速度随着散射盘尺度的增加而增加。

The Rytov approximation theory is applied to the angle-of-arrival fluctuation and the analytical expressions are developed for variance and power spectrum associated with the angle-of-arrival fluctuation of unbounded plane waves and spherical waves in strong turbulence regime. The derived expressions are then compared with the previous weak fluctuation theory, and effects of the scattering disk scale on power spectrum are analyzed. Results show that the derived displacement variances extending into weak turbulence regime are in good agreement with those of the traditional weak-fluctuation theory and are valid in all turbulence regimes; The angle-of-arrival fluctuation tends to saturate with increasing Rytov variance; The high-frequency power spectra drops at a much faster rate along with the increase of the scattering disk scale.