关键词: 精密单波束测量, RTK三维测深技术, 水下地形测量, 复杂水域

Abstract: In the underwater topographic survey, the precision of bathymetric survey in complex waters is often difficult to guaranteed because of influence of beam-width and ship attitude change. Studies have shown that the measurement precision can be effectively improved through precision bathymetric system based on narrower beam-width transducer with attitude sensors and positioning and orientation system. However, the installation and calibration of sensors in precision bathymetric system are seldom studied. In fact, we can integrate a narrower beam bathymetric system based on RTK 3D bathymetric measurement technology by using a transducer probe with narrow beam-width and a certain precision attitude sensor and POS system with a special installation device. After proper onshore calibration, it is verified in water area in Sutong Bridge on the Changjiang River mainstream. The results showed that the comprehensive bathymetric precision can be improved about 50%.

Key words: precision single-beam bathymetry, RTK three-dimensional bathymetry technology；underwater topographic survey, complex waters