Scintillation index of echo wave in slant atmosphere turbulence
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摘要: 根据光波斜程传输理论以及随高度变化的ITU-R大气折射率结构常数模型，考虑内尺度及从发射机到目标和从目标到接收机双斜程路径影响的条件下，应用修正Hill湍流折射率起伏功率谱，对反射器目标激光回波闪烁指数进行了研究。推导了回波闪烁指数随菲涅耳率的变化关系，数值分析了不同内尺度、传输距离、激光波长以及目标高度对回波闪烁指数的影响。结果表明：内尺度和目标高度对回波闪烁指数的影响要远大于波长和传输距离的影响。Abstract: Based on the theory of optical wave propagation in the slant path and the ITU-R atmospheric refractive index structure constant model which depends on the altitude, and considering the influence of inner scale, we studies the scintillation index from the transmitter to the target and that from the target to the receiver by using the modified Hill spectrum. The relationship of the scintillation index of the echo wave and the Fresnel rate is derived. The influences of inner scale, transmission distance, the beams wavelength and the target height on the echo wave scintillation index are analyzed. The results show that the inner scales and the target heights have more significant effect on the scintillation index than the wavelengths and the transmission distances.
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