Sea area gravity anomaly inversion method and system based on satellite height measurement data

Abstract

The invention provides a sea area gravity anomaly inversion method and a system based on satellite height measurement data, and the method comprises the steps: calculating the sea surface height gradient of a sub-satellite point according to the sea surface height data collected by a satellite altimeter at the sub-satellite point in a preset sea area, and calculating the model vertical line deviation gradient of the sub-satellite point according to the position of the sub-satellite point, subtracting the sea surface height gradient of the sub-satellite point from the model vertical line deviation gradient to obtain the residual gradient of the sub-satellite point; converting the residual gradient of the sub-satellite point into a vertical line deviation grid based on a weighted least square method, and obtaining the residual vertical line deviation of the grid; and calculating the residual gravity anomaly of the grid according to the residual vertical line deviation of the grid, calculating the model gravity anomaly of the grid based on the gravity field model, and adding the model gravity anomaly of the grid and the residual gravity anomaly to obtain the sea area gravity anomaly value of the grid. According to the method, the accurate sea area gravity abnormal value is obtained after strict theoretical derivation.

Description

technical field [0001] The invention relates to the technical field of geological surveying and mapping, in particular to a sea area gravity anomaly inversion method and system based on satellite altimetry data. Background technique [0002] The ocean is rich in oil and gas resources, which have been developed and utilized in large quantities, and have gradually become the main battlefield of human economic activities. The diverse geological structures provide important clues for human beings to study the evolution of the earth. Human economic activities and scientific research are inseparable from basic gravity data. [0003] Shipboard gravimetry is the main source of ocean gravity data. Its advantages are high measurement accuracy, low observation efficiency and small coverage in a linear grid distribution. The task of making full gravity measurements over approximately 70% of the world's surface area is extremely difficult and challenging. Before the 1970s, ocean grav...

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Problems solved by technology

[0007] The present invention provides a sea area gravity anomaly inversion method and system based on satellite altimetry data to solve the problem of directly using the geoid to replace the sea surface height in the prior art, and directly using the least squares configuration method to cause the geoid and gravity The covariance function model between anomalies is not accurate enough, which leads to the defect of low accuracy of gravity anomaly inversion, so as to improve the accuracy of gravity anomaly inversion

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