Triangular star map matching method based on redundant reference star

Abstract

The invention provides a triangular star map matching method based on redundant reference stars. The method comprises the following steps of: constructing a CCD star image library consisting of m1 bright stars in a CCD star image, and selecting three stars to establish a basic triangle meeting a set condition; selecting m <2> reference stars from a star catalogue to construct a reference star library, and establishing a to-be-matched triangle; respectively calculating image distances and included angles of the basic triangle and the to-be-matched triangle, and realizing matching of the basic triangle according to a corresponding image distance difference and a corresponding angle difference; and according to a three-point positioning principle, realizing the matching of a CCD star image with a fixed star in a reference star catalogue on the basis of a corresponding angle relation. According to the method, the problems of non-unique matching and high mismatching rate of a triangle algorithm are solved, the star map recognition matching rate and accuracy are remarkably improved. The method is suitable for star map recognition in the fields of astronomical navigation, astronomical geodesic and the like.

Description

Technical field[0001]The present invention relates to the field of astronomical navigation and astronomy, and more particularly to a star map matching method.Background technique[0002]The star map identifies the matching of the star in the observed image with the reference star in the star table to establish a correspondence between the CCD star image and the star, to establish a CCD image metric coordinate system and reference star cutting level ideal coordinate system The conversion model laying the foundation.[0003]With the widespread application of astronomical navigation technology, many scholars at home and abroad conduct a large number of studies in the star diagram identification technology, propose multilateral angular angle matching algorithms, triangular matching algorithms, raster algorithms, and algorithms that utilize the axis image templates, etc. The method of illustration. Although the star diagram identification method is much, it is really used for engineering pra...

AI Technical Summary

Problems solved by technology

[0005] The triangle matching algorithm has a simple structure and is easy to implement, but its characteristic mode dimension is low. Therefore, the formed matching triangle usually has problems such as non-unique matching and wrong matching, and directly matches the star point triangle and the reference star matching triangle. The workload of calculation is heavy, and a large storage capacity is also required

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