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Comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement

A geomagnetic matching and information entropy technology, which is used in navigation, measuring devices, ground navigation and other directions through speed/acceleration measurement, which can solve the problems of large time and space, achieve fast matching speed, reduce the probability of mismatching points, and improve The effect of matching speed

Active Publication Date: 2019-02-15
SOUTHEAST UNIV
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Problems solved by technology

Due to the fact that there may be large errors in the actual geomagnetic measurement value, the frequency domain calculation and filtering of the geomagnetic signal by using fast Fourier transform can eliminate the influence of high frequency noise, but it takes a lot of time and space

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  • Comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement
  • Comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement
  • Comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement

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Embodiment Construction

[0022] The present invention will be further clarified below in conjunction with the drawings and specific embodiments.

[0023] A comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement, such as figure 1 As shown, including the following steps:

[0024] Step 1. Take frequency f s Collect and record the position of the aircraft and the corresponding geomagnetic field intensity, set the geomagnetic field intensity of the current position (x, y) as F(x, y), x, y are the current longitude and latitude of the aircraft output by the inertial navigation system coordinate;

[0025] Install a geomagnetic sensor on the aircraft to measure the strength of the geomagnetic field. Before starting the measurement, the geomagnetic sensor needs to be calibrated. Pre-install applications that use GPS or gyrocompass to detect the direction of high accuracy on the aircraft, find the true north direction, when the vertical direction of the local m...

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Abstract

The invention discloses a comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement. The method comprises the following steps: 1, acquiring geomagnetic field intensity of the current position (x, y) of an aircraft, 2, obtaining a geomagnetic map covering (x, y) from a geomagnetic database, calculating the geomagnetic information entropy H (x, y)at (x, y) through an area A covering (x, y), judging whether (x, y) is located in an adapted area or not according to H (x, y), 3, setting a to-be-matched flight path template T with a mesh quantity of M*N, and a search area S, performing similarity matching on the template T on the geomagnetic map of the geomagnetic database to obtain a submap R with the maximum similarity to the template T, and4, performing kriging interpolation on the submap R to obtain a high precision and small scale geomagnetic map Map, and performing iterative solution on the geomagnetic map Map to obtain a matching value of the current position of the aircraft. The method utilizes a fuzzy similarity algorithm, selects a matching area, obtains an optimal matching point through an accurate related algorithm, and reduces the influence of interference noise on matching and positioning accuracy.

Description

Technical field [0001] The invention belongs to the technical field of geomagnetic matching assisted navigation, and particularly relates to a comprehensive geomagnetic matching method based on geomagnetic information entropy and similarity measurement. Background technique [0002] The ocean is rich in oil, natural gas and mineral resources. More and more people realize that the ocean is the second space on which mankind depends for survival and an important area for achieving sustainable development. With the development of science and technology, people have developed underwater submersibles, greatly enhancing the ability to explore the ocean. Therefore, underwater navigation technology has become a hot spot in ocean exploration. [0003] The inertial navigation system is currently the most widely used navigation method on submersible vehicles. It is an autonomous navigation system that does not rely on external information and does not radiate energy to the outside. However, ...

Claims

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Application Information

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IPC IPC(8): G01C25/00G01C21/08G01C21/16
CPCG01C21/005G01C21/08G01C21/165G01C25/005
Inventor 王立辉马明珠刘庆雅
Owner SOUTHEAST UNIV
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