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Star pattern recognition method applicable to shipborne super-wide field-of-view celestial navigation system

A star map recognition and celestial navigation technology, applied in the field of star map recognition, can solve the problems of super large field of view star map recognition speed, low recognition accuracy, etc., to improve recognition accuracy, solve low recognition accuracy, and reduce complexity Effect

Inactive Publication Date: 2018-08-31
TIANJIN UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the traditional star map recognition algorithm has a simple structure and the principle is easy to implement, there will be problems such as recognition speed and recognition accuracy reduction when applied to super large field of view star map recognition

Method used

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  • Star pattern recognition method applicable to shipborne super-wide field-of-view celestial navigation system
  • Star pattern recognition method applicable to shipborne super-wide field-of-view celestial navigation system
  • Star pattern recognition method applicable to shipborne super-wide field-of-view celestial navigation system

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Embodiment 1

[0048] The implementation case of the present invention proposes a star map recognition method suitable for a ship-borne super-large field of view astronomical navigation system, which can effectively improve the system's recognition efficiency and recognition accuracy in the process of star map recognition, and is suitable for ship-borne super-large field of view astronomical navigation systems. navigation system, see figure 2 , the identification method includes the following steps:

[0049] 101: For the star map captured by the fisheye camera, draw several concentric circles with different radii around the center of the field of view, divide the field of view into several annular and circular areas, and ensure that the area of ​​each sub-area is equal;

[0050] The embodiment of the present invention is illustrated by taking 10 concentric circles as an example. The fisheye star map can be divided into 10 sub-regions by 10 concentric circles. In the actual implementation, t...

Embodiment 2

[0061] Combined with the calculation formula below, the attached Figure 3-7 The scheme in Example 1 is further introduced, see the following description for details:

[0062] 201: Construction of navigation star database;

[0063] 1. Processing of the original star catalog:

[0064] The navigation star database is divided into two types: the navigation star catalog and the navigation star feature database. According to the obtained results, the processing of the original star catalog is one of the important links in the construction of the navigation star database.

[0065] The completeness of the navigation star catalog is mainly reflected in the fact that the navigation star catalog contains a sufficient number of brighter stars in the sky area corresponding to the field of view to ensure the maximum number of sky areas that can be identified by the star map; the star catalog is too sparse and too dense The number of sky areas should be as small as possible to ensure uni...

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Abstract

The invention discloses a star pattern recognition method applicable to a shipborne super-wide field-of-view celestial navigation system. The method comprises the steps that for a star pattern shot bya fisheye camera, ten concentric circles are drawn around the center of the field of view in different radii, the field of view is divided into ten annular and circular regions, and it is guaranteedthat the areas of all the regions are the same; in the process of constructing a guide star database, the star angular distance serves as the characteristic to sectionally store the guide star database to be multiple characteristic sub-libraries; in the recognition process, a proper-star-based multiple triangular recognition algorithm is applied, recognition is conducted from the circular region in the center of the field of view to the annular region on the edge of the field of view in sequence, and meanwhile the guide star database is retrieved rapidly according to the observation star angular distance. The method is applied to the shipborne super-wide field-of-view celestial navigation system, the good real-time property and recognition rate are achieved, and more efficient and accuratemarine celestial navigation can be achieved.

Description

technical field [0001] The invention relates to the field of star map recognition, in particular to a star map recognition method suitable for a ship-borne super-large field of view celestial navigation system. Background technique [0002] The star map recognition technology is the process and method of matching the star images in the star map with the reference stars in the navigation star library, so as to identify the stars in the field of view. In the 1950s, the American scientist Junkins first proposed the star map recognition algorithm. For decades, with the continuous development of computer technology, the star map recognition technology has also been greatly developed. Star map recognition algorithms mainly include subgraph isomorphism algorithms and pattern recognition algorithms. Among them, the subgraph isomorphism algorithm uses stars as vertices and the angular distance between stars as sides. The observed star map is regarded as The submap of the star map of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/025G01C21/203
Inventor 张喆杨乐宋菲菲
Owner TIANJIN UNIV
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