Based on the method of measuring turbulence profile with lidar, equations of backscattering speckle sizes induced by
aerosol and turbulence are given. According to the relationship between diaphragm aperture and sizes of speckles,
fluctuations of normalized variance of echo signal can be separated into dilution regime of aerosol and turbulence,
turbulent regime and smoothed regime. The feasibility of measuring turbulent profile with MPL-A1 lidar is discussed,
and experiments are performed in horizontal direction. According to the values of SNR and values of normalized
variance of echo signal, effective measuring distances of this lidar are determined. The variations of normalized variance
and those of calculated results of scintillation index, which are both depending on propagation distance, are compared.
Results show that, although the values of normalized variance are only 10 percent of the latter, there is much
comparability, especially during nighttime. Temporal variations of normalized variance, which are calculated at 1950m
during daytime and at 4500m during nighttime, are compared with those of refractive index structural constant. Analyses
show that, the fluctuant ranges of them are all about one magnitude. Although there are a small quantity of time
differences between them, total tendencies are comparable.