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在一定探测概率和虚警概率的情况下,讨论了有无大气湍流时激光雷达直接探测的信噪比;基于考虑内尺度的弱湍流闪烁指数,分析了湍流强度、内尺度对探测所需的信噪比的影响;并对于不同光束半径,在束轴上与离轴处探测所需的信噪比也进行了计算。结果表明:湍流越强,其影响越大;波长越短,所要求的SNR越大;内尺度的影响在较短波长和较强湍流时不可忽略,尤其在发射孔径较小、探测点偏离波束中轴时更应考虑其影响。通过分析表明,为了减小湍流对探测系统性能的影响,可以增加发射孔径。
Under certain probabilities of probing and false alarm, the signal-to-noise ratio of direct detection by lidar in the presence of atmospheric turbulence is discussed. Based on the weak turbulence scintillation index which accounts for the internal scale, the effects of turbulence intensity and internal scale on the detection Signal to noise ratio; and for different beam radii, the beam axis and off axis at the required signal to noise ratio were also calculated. The results show that the stronger the turbulence, the larger the required SNR. The shorter the wavelength and the stronger the turbulence, the shorter the aperture and the stronger turbulence. Especially when the aperture is small and the detection point deviates from the beam Axis should consider its impact. The analysis shows that in order to reduce the influence of turbulence on the performance of the detection system, the emission aperture can be increased.