In this paper, the observed land surface height data and tidal data in the Yellow River delta foreland area are used to describe the variations in depth datum and tidal level in the area.

通过黄河三角洲前沿陆地高程的变化和验潮获得的资料，介绍了黄河三角洲前沿深度基准面的变化和潮位变化情况。

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Some key techniques, such as attitude correction, quality control of GPS height, transformation of vertical reference datum and extraction of tidal level, are studied in detail.

这些关键问题主要有姿态改正、GPS高程质量控制、垂直基准转换、基于信号的在航潮位提取。

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