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This lecture covers the analysis of satellite reflection surfaces for precise positioning. It explains the method of using GNSS signals reflected on surfaces, evaluating signal properties, and the impact of surface roughness. The instructor presents a simulator for reflection points, discusses the influence of receiver positioning, and the simulation results. The lecture also delves into tsunami prediction, atmospheric models, and the potential improvements in surface property measurements. It concludes with a critical review of the method's precision and its applicability in real cases.