Satellite altimetry gravity data and ship borne gravity data fusion method of combining fractal interpolation and net function interpolation

Abstract

The invention discloses a satellite altimetry gravity data and ship borne gravity data fusion method of combining fractal interpolation and net function interpolation. The method includes the basic steps of: using net function interpolation for interpolation on satellite altimetry gravity data; calculating difference values of an interpolation result and the ship borne gravity data; carrying out clustering analysis on the difference values, and dividing a whole area into a plurality of sub-areas; carrying out fractal interpolation on the difference values on each longitudinal and horizontal grid edge of each sub-area, carrying out net function interpolation inside the sub-areas, and obtaining gravity data correction values; and using the gravity data correction values as centers, carryingout fusion calculation to obtain a data fusion product for each sub-area according to the satellite altimetry gravity values, and finally, obtaining a whole-area data fusion product. The method provided by the invention is scientific and reasonable, a realization process is simple and easy to understand, high-precision and high-resolution gravity data can be obtained after fusion on the ship bornegravity data and the satellite altimetry gravity data, and at the same time, similarity of local features and overall features of the multi-source gravity data is fully maintained.

Description

technical field [0001] The invention relates to the technical field of data fusion, in particular to the application field of multi-source ocean gravity data fusion, specifically a fusion method of satellite altimetry gravity data and ship survey gravity data combining fractal interpolation and network function interpolation. Background technique [0002] The high-precision and high-resolution ocean gravity field is helpful for the study of the earth's internal geological structure, and it is also an important basis for the study of ocean dynamic environment changes. In addition, the high-precision and high-resolution gravity anomaly is very important for the exploration and development of marine mineral resources, the protection of spacecraft and The firing of long-range weapons is also significant. In the traditional sense, the detection of marine gravity field mainly relies on the gravity measuring instruments deployed on the seabed or carried by ships on the sea surface,...

AI Technical Summary

Problems solved by technology

In the traditional sense, the detection of marine gravity field mainly relies on the gravity measuring instruments deployed on the seabed or carried by ships on the sea surface, which have high precision but high cost and long operation period. The resolution of gravity anomaly data is low, and due to various factors, Unable to obtain gravity anomaly data in sensitive areas

With the development of aerospace technology, the technology of using satellite altimetry to retrieve ocean gravity anomalies has matured, and it has also become the only means to obtain large-scale high-resolution ocean gravity anomalies, but its disadvantage is that the accuracy of inversion of gravity anomalies is low

[0003] At present, there are mainly two kinds of data fusion, statistical method and analytical method. The statistical method is mainly based on statistical principles, and the least squares allocation method is used for data fusion. However, this method requires a large amount of observation data to construct a covariance function, and There is no clear standard for the selection of different function models. Generally speaking, the operation and calculation of statistical methods are relatively complicated and difficult to implement

The analytical method focuses on data interpolation, but the current interpolation method only depends on the general form of traditional interpolation in mathematics, which makes the interpolation curve or surface develop in a smoother direction. For discrete points, extremely irregular curves Or the surface has a large deficiency

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