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The analysis and calculation of tides play a very important role in the correction of water level. The analysis and calculation accuracy are directly related to the correction of water level and the calculation of depth reference surface. For the problem that the observation error is not correlated in the tidal harmonic analysis, and the actual situation of the correlation of the observation error is taken into account. On the basis of the traditional harmonic analysis model, the cofactor matrix is derived by calculating the correlation coefficient sequence of different time intervals of residual water level, and the new observation weight matrix is obtained by inversion. The tidal harmonic analysis model based on the correlation of observation errors is derived and improved. The experimental analysis is carried out by tidal data of monthly adjustment and analysis, and the experimental results show that most of the main tidal harmonic constants are closer to the results of 2019, and the forecast tidal level is closer to the real tidal level. The improved method has achieved certain improvement effects.

Research on tidal harmonic analysis based on correlation observation error