室外大气折射率结构常数实时测量研究

Real time measurement of outdoor atmospheric refractive index structure constant

摘要:

与传统的射频链路相比，自由空间光通信FSOC（Free Space Optical Communication）系统是对现有无线通信技术的有力补充，为了抑制大气湍流对信号光束带来的相位噪声和强度波动，有必要对通信信道状况进行实时监测。首先介绍了基于光斑质心漂移的大气折射率结构常数测量方法，利用大口径接收靶面和窄带滤光片，结合实时图像处理算法，实现了大气折射率结构常数的全天候实时监测。将大气折射率结构常数和光强闪烁指数进行了比较分析，测量结果表明它们的包络之间具有很好的线性关系，进一步验证了实时测量系统的可靠性。

Abstract:

Compared with the traditional radio frequency link, free space optical communications (FSOC) system is a powerful supplement to existing wireless communications technology. In order to suppress the phase noise and intensity fluctuation of signal beam caused by atmospheric turbulence, it is necessary to monitor the condition of channel link in real time. Firstly, the measurement method of atmospheric refractive index structure constant based on spot centroid drift is introduced. All-day real-time monitoring of atmospheric refractive index structure constant is realized by using large aperture receiving target and narrow band filter combined with real-time image processing algorithm. Refractive index structure constant and intensity scintillation index are compared and analyzed. The measurement results show that there is a good linear relationship between their envelopes, which further verifies the reliability of our real-time measurement system.