关键词: 水深测量, 无验潮, 传感器, 船体坐标系, 质量控制, 水下地形测量

Abstract: With the systematic analysis on the principle and process of current simple underwater topographic survey without tidal observation, we find out the factors and critical steps that limit or significantly affect the products of survey. Based on these, a new idea of precision surveying method of water depth without tidal observation integrated by multi-sensors is proposed, which differs from current method. Based on the data from multi-source sensors such as GNSS, bathymeter, attitude transducer and electric compass, in combination with fused information from RTK and Heave, the altitude data by RTK can be dynamically controlled. Based on homogeneous vertical motions, the dynamic series of time-varying delays can be achieved accurately. Through the information fusion of data from attitude transducer, compass and RTK, the unified correction of vessel attitude is achieved, and the 3D coordinates of underwater measuring point is achieved at centimeter magnitude. The traditional water depth measurement accuracy is improved by one order of magnitude. The field practices of engineering measurement further prove the validity and liability of the method.

Key words: water depth measurement, without tidal observation, sensor, vessel coordinate system, quality control, underwater topographic survey