Scintillation of THz transmission by atmospheric turbulence near the ground

Considering the two main factors which affect the terahertz band atmospheric refractive index structure parameter: temperature and humidity, this paper studies the influence on the refractive index structure parameter from temperature structure constant, humidity structure constant and joint structure constant of temperature and humidity by using the actual measured values in the infrared band, and shows the difference between the atmospheric refractive index structure parameter of THz band and that of optical band. Relationship between scintillation index and various parameters in the condition of zero-inner-scale or nonzero-inner-scale for plane wave and sphere wave is analyzed and discussed. Research shows that the THz scintillation effect is strong, and the scintillation index of plane wave is larger than the spherical wave; the inner scales of turbulence, frequency and transmission distance produces important influences on the scintillation index.