The main aim of this work is research on the use of satellite positioning GNSS – RTK / RTN techniques toestimate the trajectory of a hydrographic boat. Modern hydrographic boat is the carrier of advanced bathymetrysystem, integral with GNSS positioning techniques. The key elements of the correct execution of the hydroacousticsurvey are two elements: the height of the water surface and precise determination of the position in the moment ofperforming depth measurement. Integrated Bathymetric System (ZSB) is installed on a floating platform which is inconstant motion. To obtain correct results of the hydroacoustic survey, it is necessary to know the precise (3D)position of the platform. In this paper the author presented his own research on the precise determination of accurateand reliable trajectory of a boat. The proposed method uses Real Time Kinematic (RTK) techniques of satellitepositioning GNSS (Global Navigation Satellite Systems). The article presents examples of the results obtained duringthe research work at the largest Polish river.

DOI: https://doi.org/10.3846/enviro.2017.239