孔径接收下大气闪烁频谱的理论和实验研究
Theoretical and experimental study on power spectrum of atmospheric scintillation with aperture receiving
-
摘要: 基于孔径接收下的对数振幅时间相关函数，推导了弱湍流起伏条件下大气闪烁频谱的表达式，分析了接收孔径对大气闪烁频谱的影响。通过完成水平大气传输实验，实际测量了孔径接收下的大气闪烁频谱。实验结果验证了理论计算。结果表明，孔径接收下的大气频谱分为低频段和高频段两部分，低频谱为常数，高频谱呈幂指数关系变化，且幂指数为-11/3；随着接收孔径增大，频谱在各频率点上的幅值逐渐减小，其形状保持不变。Abstract: Based on the temporal covariance of logarithmic amplitude, analytical expression was obtained for power spectrum of atmospheric scintillation with aperture receiving in the weak fluctuation regime. The effect of the receiving aperture on the power spectrum of atmospheric scintillation was analyzed, the experiment of laser propagation through atmosphere was accomplished and the real power spectrum of atmospheric scintillation was obtained. The theoretical analysis accords well with experiment results. These results show that the power spectrum of atmospheric scintillation with aperture receiving includes low-frequency spectrum and high-frequency components. The amplitude of the low-frequency spectrum is constant. The high-frequency spectrum obeys the power law with an exponent of -11/3. Whe
-
Key words:
- power spectrum /
- temporal covariance /
- aperture averaging /
- laser propagation
-
点击查看大图
计量
- 文章访问数: 2060
- HTML全文浏览量: 252
- PDF下载量: 426
- 被引次数: 0
下载:
