Multi-source gravity data fusion method based on wavelet transform

Abstract

The invention discloses a multi-source gravity data fusion method based on wavelet transform. Based on the satellite gravity data grid point, the gravity value of the ship measurement point coordinates is calculated by interpolation, and a variety of wavelet functions and multi-layer decomposition of the interpolation result and the ship measurement gravity data are completed based on the wavelettransform. The rich high-frequency information in the ship measurement gravity data is effectively extracted, and the low-frequency effective components of the satellite gravity data are reasonably extracted; the gravity fusion data of the ship measurement point coordinates is obtained through the established evaluation method, reasonable selection of the wavelet functions, the number of the decomposition layers, and wavelet transform; based on the fusion data and satellite scatter data, the data of the satellite scatter point position in the study area is obtained through re-interpolation, and the high precision marine gravity results data of the research area is reasonably obtained under the condition of both the accuracy and a fusion effect. The multi-source gravity data fusion method based on wavelet transform has high practical application value.

Description

technical field [0001] The invention relates to the application field of high and low frequency information fusion of multi-source ocean gravity scattered point data, in particular to a multi-source gravity data fusion method based on wavelet transform. Background technique [0002] The ocean gravity field can provide gravity data for the study of the shape of the earth and the internal structure of the earth, the exploration of marine mineral resources, the guarantee of spaceflight and the launch of long-range weapons. With the continuous improvement of marine gravity exploration technology, there are more and more ways to obtain gravity field data, and the accuracy is getting higher and higher due to the year-by-year accumulation of data volume, and the application range is becoming more and more extensive. [0003] At present, the gravity field data is mostly obtained by ship-borne gravity measurement and satellite altimetry technology. How to integrate satellite gravity ...

AI Technical Summary

Problems solved by technology

[0004] Due to its wide coverage and multiple round-trip orbit measurements, satellite gravity data can make up for the gaps between survey lines of ship survey data, but limited by the number of satellites and the gravity field inversion method, the detailed information of local areas is smoothed However, it needs to be supplemented by the high-frequency information in the scattered point data of the ship survey.

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