Underwater gravity gradient target detection method based on Newton iteration method

Abstract

The invention discloses an underwater gravity gradient target detection method based on a Newton iteration method. The method comprises a step of performing real-time measurement on a sailing area byusing a gravity gradiometer of an underwater vehicle to obtain a measured gravity gradient value, a step of subtracting a normal gravity gradient value from the measured gravity gradient value to obtain a gravity gradient anomaly value, a step of taking the gravity gradient anomaly value as an input of a gravity gradient model nonlinear equation and solving a nonlinear equation group to obtain therelative position of the centroid of a target body relative to a detection point, a step of determining a distance between the centroid of a target body relative and the detection point according tothe relative position of the centroid of the target body relative to the detection point, and a step of substituting the above distance and a universal gravitation constant into a gravity gradient vertical component formula to obtain the mass of the target body. The approximate substance type of a density anomalous body can be calculated according to needs. The method has anti-camouflage and anti-interference characteristics, the detection method is simple and popular and is easy and fast to use, the manual intervention is greatly reduced, and automatic detection is achieved.

Description

technical field [0001] The invention belongs to the technical field of underwater target detection, and in particular relates to a passive navigation target detection method utilizing gravity field correlation assistance. Background technique [0002] Nowadays, there are many ways of underwater navigation, such as GPS satellite navigation, astronomical navigation, radio navigation, etc. Navigation based on gravity gradient (here refers to the vertical gravity gradient) does not need to receive external information, and does not send information to the outside. Radiation information and many advantages such as difficulty in interference are passive navigation in the strict sense. [0003] The use of gravity gradiometers for assisted navigation began in the 1960s. From the initial research focusing on real-time detection of gravity anomalies to improve the accuracy of inertial navigation systems, it developed into high-precision and high-resolution gravity map research based o...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an underwater gravity gradient target detection method based on the Newton iterative method, which can accurately and efficiently obtain the target mass. and position, and roughly judge the type of substance without depending on the shape, with anti-camouflage and anti-interference characteristics, the detection method is simple and popular, convenient and fast to use, greatly reducing manual intervention, and realizing automatic detection

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