Star map identification method based on simplest general subgraph

Abstract

The invention discloses a star map identification method based on a simplest general subgraph, which comprises the steps of establishing an angular distance database, specifically including selectionof navigation stars, establishment of the angular distance database and establishment of an index table; selecting to-be-identified observation stars, sequentially defining one of the observation stars as a main star, recording matching results of angular distances from the main star to the remaining stars and navigation star pairs in the database through two rounds of voting, and preliminarily screening candidate stars of the observation stars; sequentially taking the highest ticket candidate star of each observation star, determining the highest ticket candidate stars as a matching group ofthe main star, selecting the simplest general subgraph according to the size of the matching group, and then constructing an isomorphic subgraph on the basis of the matching group; and taking two stars of the isomorphic subgraph, determining a rotation matrix and an attitude angle by utilizing double-vector attitude determination, verifying the isomorphic subgraph through reprojection, and outputting an identification result of the observation star. The method inherits the reliability of a polygon algorithm and the high efficiency of a group matching algorithm, and has good robustness for starpoint position noise, star magnitude noise and artificial stars.

Description

technical field [0001] The invention relates to star sensor technology in the aerospace field, in particular to a star map recognition method based on the simplest general subgraph. Background technique [0002] The star sensor is an important part of the attitude control system of the spacecraft, which realizes the acquisition of the three-axis attitude of the spacecraft by identifying the stars in the star map. The attitude measurement accuracy of the star sensor can reach the arc-second level, and it has been widely used in space vehicles. [0003] Star pattern recognition is the key technology of star sensor. The existing star map recognition algorithms are mainly divided into two categories, one is the pattern recognition algorithm represented by the grid algorithm and the radial ring algorithm, and the other is the sub-graph simultaneous algorithm represented by the polygon algorithm and the group matching algorithm. construction algorithm. Compared with pattern alg...

AI Technical Summary

Problems solved by technology

[0006] The technical solution of the present invention: In order to solve the reliability and efficiency problems of the polygon algorithm and the group matching algorithm, a star map recognition method based on the simplest general subgraph is provided. The present invention inherits the reliability and group matching algorithm of the polygon algorithm. The high efficiency of the matching algorithm has good robustness to star position noise, magnitude noise and false stars

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