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Method for recognising star map based on triangle character

A star map recognition and triangle technology, applied in the aerospace field, can solve the problems of speeding up recognition, reducing storage capacity, demanding requirements, etc., and achieve the effect of saving storage space

Inactive Publication Date: 2006-07-05
BEIHANG UNIV
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Problems solved by technology

[0008] The purpose of the present invention is: directly storing all navigation triangles will bring huge storage capacity, many redundant matches, and Quine and Heide's selection of triangles that require relatively harsh brightness information, etc., the present invention improves the triangle algorithm, A method of triangle matching is proposed in the form of storing the star-to-star angular distance, so as to greatly reduce the storage capacity and at the same time, speed up the recognition speed

Method used

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  • Method for recognising star map based on triangle character
  • Method for recognising star map based on triangle character
  • Method for recognising star map based on triangle character

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Embodiment Construction

[0033] The present invention will be described in further detail below.

[0034] Generation and storage of star pairs.

[0035]The present invention uses the form of angular distance matching to realize triangle matching, so a star pair database corresponding to the angular distance must be constructed first. Regardless of the limitation of the field of view, theoretically N navigation stars can form N(N-1) / 2 star pairs, which is much smaller than the number of possible triangles N(N-1)(N-2) / 6. The generation process of the star pair is as follows: After scanning and screening the navigation star catalog, if there are two stars whose angular distance is less than d, record the angular distance and the serial numbers (star pair) of the two stars. Here, d is the diagonal distance of the field of view, when the field of view is 12°×12° Star pairs are stored in ascending order of angular distance. In order to facilitate the matching search of the star pair angular distance, al...

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Abstract

The invention belongs to the field of spaceflight technique, relating to the improvement of the star map identification method. The method has the steps of: 1. constructing and storing angular spacing-corresponding star pair database; 2. selecting observing triangle; 3. identifying the triangle; 4. verifying. The invention saves memory space, needs no accurate brightness information, and has stronger error recovery ability and very high searching and identifying speeds.

Description

technical field [0001] The invention belongs to the field of aerospace technology and relates to the improvement of a star map recognition method. Background technique [0002] The star sensor is a high-precision, high-reliability attitude measurement component widely used in today's aerospace vehicles. Its working principle is: the CCD (or CMOS) image sensor captures the starry sky image within the current field of view, and the image is processed by signal , extract the position (and brightness) information of the star in the observation field of view, and use the star map recognition algorithm to find the corresponding match of the observed star in the navigation star catalog, and finally use these matching star pairs to calculate the three-axis attitude of the star sensor. The star map recognition algorithm is a core part of the star sensor. Among the many existing star map recognition algorithms, the triangle algorithm is the most common star map recognition method use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/24
Inventor 张广军魏新国江洁
Owner BEIHANG UNIV
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