GPS测高技术在无验潮水深测量中的应用

应用双频GPS动态后处理高精度定位技术，建立了一套完整的GPS无验潮海洋深度测量作业模式，通过海上试验与传统作业模式作了数值分析比较，结果表明，该作业模式不仅无需验潮，而且能够有效消除传统作业模式中船只动态吃水和涌浪等因素对测量成果的影响，显著提高水深测量成果的精度。

The Application of GPS Altimetry in Hydrographic Surveying Without Tidal Observation

Depth measurement is the main task of hydrographic surveys. However, the water surface changes as a result of tide and wind effects. Depth values measured at any time and water level should be reduced to a specific vertical datum in order to be used at a different time and different water level. To accomplish that, the changes in water level must be determined. Traditionally, many different types of tide gauges are used for this purpose. The aim of this study is to establish the connection of depth values to a vertical datum without using tital observation.For this purpose, a post-processing algorithm based on GPS measurement is introduced here. A numerical comparison between the depth values from the new and the traditional surveying modes is carried out. The result shows that, the depth of each measured point relative to a specific vertical datum may be obtained without using a tide gauge via the proposed method. Furthermore, if this method is performed, important error sources, which have resulted from the irregular vertical motion of the vessel, such as heave, surge, etc. could be eliminated.