Method for improving ocean gravity field interpolation precision based on submarine topography three-dimensional optimization principle

Abstract

The invention discloses a method for improving ocean gravity field interpolation precision based on a submarine topography three-dimensional optimization principle. The method comprises steps of submarine topography data and a global gravity field model being acquired; constructing a three-dimensional ocean gravity anomaly model according to the acquired submarine topographic data and the global gravity field model; performing interpolation calculation on the three-dimensional ocean gravity anomaly model to obtain a geoid three-dimensional correction model; and according to the geoid three-dimensional correction model, determining a gravity anomaly value at an unknown point in the prediction area to obtain a high-precision and high-spatial-resolution marine gravity anomaly map. According to the method, the submarine topography is introduced into a common two-dimensional Kriging formula, a novel submarine topography three-dimensional optimization method is constructed, the precision loss is minimized while the spatial resolution of the global marine gravity anomaly map is improved, the interpolation precision is high, the calculation speed is high, and an effective basis is providedfor improving the submarine gravity matching navigation precision.

Description

technical field [0001] The invention belongs to the interdisciplinary technical fields of marine gravity, underwater navigation and the like, and in particular relates to a method for improving the interpolation accuracy of the marine gravity field based on the three-dimensional optimization principle of the seabed topography. Background technique [0002] Submarines generally rely on inertial navigation systems to navigate underwater. The important components of inertial navigation systems are gyroscopes and accelerometers. The acceleration measured by these sensitive components can be integrated with time to obtain speed, yaw angle, position, etc. information. In the integration process, the error increases with time, and the navigation accuracy of the submarine will gradually decrease when the submarine operates underwater for a long time. In view of the shortcomings of the inertial navigation system, many scholars have proposed to combine passive navigation methods such...

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Problems solved by technology

At present, the spatial resolution of my country's global ocean gravity anomaly map is low, and the spatial resolution of the existing global ocean gravity anomaly map cannot meet the needs of global high-precision underwater gravity matching ...

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