Assimilation method of measured marine environmental data based on sequence recursive filtering three-dimensional variation

Abstract

The invention provides a method for assimilating measured marine environment data based on sequence recursive filtering three-dimensional variation. Including preprocessing the measured data of the marine environment; calculating the value of the objective function; calculating the gradient value of the objective function; calculating the minimum value of the objective function; extracting the spatial multi-scale information in the measured data; updating the background field data to form the final data assimilation Analysis field. The invention improves the traditional three-dimensional variational method of recursive filtering, sequentially assimilates information of different scales, effectively overcomes the problem that the traditional three-dimensional variational method cannot effectively extract multi-scale information; adopts a high-order recursive Gaussian filter, And the cascade form of the high-order recursive filter is converted into a parallel structure, so that the recursive filtering process of the recursive Gaussian filter can be executed in parallel, and many problems caused by the cascaded filter are overcome.

Description

technical field [0001] The invention relates to a method for assimilating measured marine environment data, in particular to a method for assimilating measured marine environment data based on sequence recursive filtering three-dimensional variation. Background technique [0002] The ocean is the activity space of underwater submersibles. The small and medium-scale ocean processes such as clines and internal waves in the ocean directly threaten the navigation safety of submersibles and affect the smooth execution of their tasks. Therefore, it is of great significance to realize the real-time construction of the navigation environment field around the submersible and the rapid diagnosis of small and medium-scale ocean processes. At present, there are two main ways to obtain marine environmental data. One is to use numerical models to obtain data, which can only approximately reflect the regular characteristics of the marine environmental field, and it is difficult to extract ...

AI Technical Summary

Problems solved by technology

However, the correlation length method and the recursive filtering method have common defects, that is, it is difficult to effectively extract multi-scale observation information

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