The application of the result of GPS in the area of the Yangtze river mouth, bring about non-tiding for sounding;

The application of GPS-RTK technique in water depth measurement;

The basic procedure of water depth measurement job system was introduced,the matters need attention during jobbing was proposed.

This paper introduces the research on supervision technology of bathymetric survey,which has been applied successfully to the acceptance survey of dredging project.

The surface subsidence in the Yellow River delta foreland area brings changes to the land surface height there,and the depth datum in the bathymetric survey is determined on the basis of the level of land bench mark,so the changes in the level of land bench mark will affect the determination of depth datum and the accuracy of bathymetric survey.

GPS-RTK bathymetric survey technique without tidal observation was successfully applied in Yangtze Estuary Channel Regulation Project for monitoring of river regime near leading jetty.

The underwater topography survey is playing the important role in the inland river and in the coast engineering construction and the water depth survey precision is always paid key attention to.

The operating mode of H/HCZ-02 multi-functional sounding automatic system can meet the demands of hydrographic survey in new time.

Contraposing these problem,we put forward to accomplish the work of sounding based on PPP without tide gauge,moreover we validate the feasibility according to this method from the aspect of static and dynamic positioning.