High-resolution sound velocity profile data compression method based on empirical orthogonal function decomposition

Abstract

The invention belongs to the technical field of marine acoustics application of three-dimensional temperature-salinity-depth data, and particularly relates to a high-resolution sound velocity profile data compression method based on empirical orthogonal function decomposition. The method specifically comprises the following steps of providing data by using a high-resolution marine reanalysis product, and converting by using a sound velocity formula to obtain the seawater sound velocity profile data; according to the characteristics of the technical field of marine acoustics application, extending the high-resolution and long-time sequence sound velocity profile data under a certain space-time dimension to a seabed sedimentary layer; using a feature vector of a main mode as a primary function of the sound velocity profile empirical orthogonal function decomposition, and compressing and expressing the high-resolution and long-time sequence sound velocity profile information under the certain space-time dimension. According to the invention, the technical scheme of obtaining sound velocity profile data compression from a high-resolution ocean reanalysis product is realized; the effective compression of the sound velocity profile data under the certain time-space dimension is realized, and the beneficial effect that the compression rate of the high resolution and long-time sequence sound velocity profile data is more than 90%, is obtained.

Description

technical field [0001] The invention belongs to the technical field of ocean acoustics application of three-dimensional temperature, salt and depth data, and in particular relates to a high-resolution sound velocity profile data compression method based on empirical orthogonal function decomposition. Background technique [0002] Marine interests are related to national security and development interests. In the field of marine acoustics application technology, the sound velocity profile is an important data basis for the modeling and analysis of the underwater acoustic field, the calculation and evaluation of acoustic performance, and the perception of underwater acoustic target information. High-resolution sound velocity profile data help to obtain refined ocean acoustic information, thereby improving the support capability and level of marine environmental data. Due to the large spatial scale of the Earth's oceans, the horizontal spatial resolution of high-resolution mar...

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Problems solved by technology

CN109725053A discloses a method for obtaining water acoustic field characteristic data based on high-resolution ocean reanalysis products, and its data analysis object is the same as the present invention, but does not mention adopting empirical orthogonal function decomposition to carry out data compression of sound velocity profile

CN110222872A discloses a marine multi-element medium and long-term statistical prediction method based on empirical orthogonal function decomposition, which mainly solves the problem of improving the timeliness of marine forecasting on the basis of marine forecasting models

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