关键词: 水深测量, 机载激光测深技术, 红外激光, 绿激光, 水面穿透量

Abstract: Compared to the airborne double-laser LiDAR bathymetry (ALB) system, the airborne single-green LiDAR bathymetry system only uses green laser to detect the water surface and the water bottom but removing the emission and reception of infrared laser, which reduces the cost and weight of the bathymetry system. Due to the unreliable echo of green laser on water surface, the bathymetric accuracy obtained by the system decreases significantly. Therefore, this paper introduces the causes of uncertain water surface echo, and quantitatively analyses the water-surface elevation error caused by the echo problem through experiments. We remedy the error of elevation survey by the statistical analysis method for improving the bathymetric accuracy of the system. The experiment showed that the water-surface elevation error of traditional green laser reached 24.74 cm in the experiment area, and reduced to 0.28 cm by the proposed method. The results prove that the proposed method can significantly improve accuracy of the single-green bathymetric system, and provide a high-accuracy, low-cost and efficient way to scan shallow water topography in a large area.

Key words: bathymetry, single green airborne LiDAR bathymetry, infrared laser, green laser, water surface penetration