A Method of Underwater Gravity Matching Navigation Adaptation Area

Abstract

The invention discloses a method for optimizing an underwater gravity matching navigation adaptation zone. The method comprises the steps that a gravity field characteristic parameter is acquired; anindex evaluation model is constructed based on a principal component analysis criterion and a weighted average principle according to the gravity field characteristic parameter; the value of the gravity field characteristic parameter is taken as input of the index evaluation model, and an evaluation score is output by the index evaluation model; the underwater gravity matching navigation adaptation area is determined and output according to the evaluation score. The method for optimizing the underwater gravity matching navigation adaptation zone has the advantages that gravity anomaly standarddeviation, slope standard deviation, roughness, gravity anomaly difference entropy, fractal dimension and other main gravity field characteristic parameters are comprehensively analyzed, the principal component analysis criterion and the weighted average principle are combined, a principal component weighted average normalization method is proposed, a total characteristic parameter index of eacharea of a gravity anomaly reference map is obtained, then good adaptation areas, general adaptation areas and non-adaptation areas are divided according to the total characteristic parameter index, and the rationality of the division index is verified.

Description

technical field [0001] The invention belongs to the technical field of aerospace and marine surveying and mapping, and in particular relates to a method for underwater gravity matching navigation adaptation area. Background technique [0002] The underwater vehicle navigation system is mainly an inertial navigation system (INS), which has the characteristics of not relying on external information, not radiating energy to the outside world, not limited by external conditions such as location (climate), and good concealment. Navigation and precision strikes of weapon systems provide favorable conditions, but the INS system has the disadvantage of accumulating errors over time, so external navigation equipment is required for correction. Due to the irregularity of the earth's shape and the inhomogeneity of the medium density, the gravity value of each point on the earth is different, and it is expressed as a function of the spatial position (longitude, latitude, height), so the...

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Problems solved by technology

[0002] The underwater vehicle navigation system is mainly an inertial navigation system (INS), which has the characteristics of not relying on external information, not radiating energy to the outside world, not limited by external conditions such as location (climate), and good concealment. Navigation and weapon system precision strikes provide favorable conditions, but the INS system has the disadvantage of accumulating errors over time, so external navigation equipment is required for correction

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