Submarine navigation method and system based on multi-dimensional gravity gradient lighthouse

Abstract

The invention relates to a submarine navigation method and a submarine navigation system based on a multi-dimensional gravity gradient lighthouse. The submarine navigation method comprises the following steps of: acquiring the position of a position point in the ocean; according to the position point, adopting a high-precision gravity field model to determine ocean gravity gradient data; screeningthe ocean gravity gradient data, and determining gravity gradient lighthouses; acquiring the position of the current sea region and the current position of a submarine; determining a matched gravitygradient lighthouse according to a gravity gradient lighthouse database, the position of the current sea region and the current position of the submarine; determining the position of the submarine according to the matched gravity gradient lighthouse and marine gravity gradient data measured by a ship-borne gradient gravimeter; and resetting an inertial navigation system according to the position of the submarine. According to the submarine navigation method and the submarine navigation system based on the multi-dimensional gravity gradient lighthouse, the safety and accuracy of navigation of the gravity lighthouse in a gravity gentle region can be improved.

Description

technical field [0001] The invention relates to the field of underwater vehicle gravity navigation, in particular to a submarine navigation method and system based on a multi-dimensional gravity gradient lighthouse. Background technique [0002] The gravity lighthouse navigation method is to filter out the data with obvious characteristics from the global ocean gravity anomaly map, and construct the gravity lighthouse database. Correlation analysis is carried out between the measurement results of the boat-mounted gravimeter and the gravity lighthouse, so as to obtain its own coordinates and correct the inertial navigation system. [0003] However, gravity lighthouse navigation is limited by the ups and downs of the ocean's gravity field, and not every sea area can screen out gravity lighthouses. In most areas, the gravity field changes smoothly, and gravity lighthouses cannot be used for matching navigation, so submarines can only use other "non-passive" auxiliary navigati...

AI Technical Summary

Problems solved by technology

[0003] However, gravity lighthouse navigation is limited by the fluctuation of the ocean's gravity field, and not every sea area can filter out gravity lighthouses

The gravity field changes smoothly in most areas, and gravity lighthouses cannot be used for matching navigation, so submarines can only use other "non-passive" auxiliary navigation methods, which reduces the safety of submarines

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