Fig. 1. Mixed echo signal of pulsed laser in cloud environment

Fig. 2. LMS filtering principle

Fig. 3. Relationship between step size and error in different a₁ values

Fig. 4. Relationship between step size and error in different a₂ values

Fig. 5. Influence of a₄ on algorithm convergence performance

Fig. 6. Influence of a₅ on algorithm convergence performance

Fig. 7. Comparison of simulation filtering of laser echo interference with different pulse widths in cloud environment. (a) Original interference signal; (b) filtered signal

Fig. 8. Comparison of simulation filtering of laser echo interference with different energies in cloud environment. (a) Original interference signal; (b) filtered signal

Fig. 9. Comparison of simulation filtering of laser echo interference at different moments in cloud environment. (a) Original interference signal; (b) filtered signal

Fig. 10. Comparison of experimental filtering of laser echo interference with different pulse widths in cloud environment. (a) Original interference signal; (b) filtered signal

Fig. 11. Comparison of experimental filtering of laser echo interference with different energies in cloud environment. (a) Original interference signal; (b) filtered signal

Fig. 12. Comparison of experimental filtering of laser echo interference at different time in cloud environment. (a) Original interference signal; (b) filtered signal