Fig. 1. Schematic diagram of overlap factor

Fig. 2. Flow chart of acquisition and correction algorithm for overlap factor

Fig. 3. Single group lidar experimental observation data (17:04-17:06, August 28, 2021). (a) RSCS; (b) optical parameters; (c) lidar ratio

Fig. 4. Calculation and correction results of overlap factors. (a) RSCS at wavelength of 387 nm; (b) overlap factor; (c) RSCS corrected by overlap factor; (d) aerosol optical parameters corrected by overlap factor

Fig. 5. THI diagram of atmospheric aerosol extinction coefficient (20:00—24:00, August 28, 2021). (a) Aerosol extinction coefficient before corrected by overlap factor; (b) aerosol extinction coefficient after corrected by overlap factor

Fig. 6. Geometric and experimentally observed overlap factors. (a) Geometric overlap factor with laser beam pointing change of 25 μrad; (b) relative bias of geometric overlap factor; (c) maximum value, minimum value and average of experimentally observed overlap factor; (d) relative bias of experimentally observed overlap factor

Fig. 7. Comparison between extinction coefficient corrected by overlap factor and extinction coefficient detected via visibility meter. (a) Extinction coefficient varying with time; (b) correlation analysis

Table 1. Parameters of Raman-Mie scattering lidar system^[23]