Fig. 1. Schematic of lidar measurement

Fig. 2. Comparison of three scattering phase functions. (a) λ=10.07 μm, g=0.799; (b) λ=3.90 μm, g=0.690

Fig. 3. Multiple scattering transmission process

Fig. 4. Change of correction factor m(r) with visibility level

Fig. 5. Scattering reception probability of dust aerosols. (a) Proposed improved scattering phase function method; (b) traditional HG function method

Fig. 6. m(r) of Raman scattering phase function when visibility is at level Ⅳ

Fig. 7. Haze weather echo signal when visibility is at level Ⅳ. (a) Original power echo signal; (b) echo signal after range correction

Fig. 8. Relevant parameters of haze weather when visibility is at level Ⅳ. (a) Extinction coefficient profile; (b) atmospheric optical thickness profile

Fig. 9. Scattering reception probability of water-soluble aerosols. (a) Proposed improved scattering phase function method; (b) traditional HG function method

Fig. 10. m(r) of Raman scattering phase function when visibility is at level Ⅴ

Fig. 11. Heavy rain weather echo signal when visibility is at level Ⅳ. (a) Original power echo signal; (b) echo signal after range correction

Fig. 12. Relevant parameters of heavy rain weather when visibility is at level Ⅴ. (a) Extinction coefficient profile; (b) atmospheric optical thickness profile