Method for eliminating close-packed stellar field from star catalogue

Abstract

A method for eliminating dense stellar field in a catalogue of stars comprises (1) selecting n stars with stellar magnitude lower than MT from an astronomical catalogue with gross star number of t to form a pre-selection catalogue of stars, (2) arranging a score counter with initial value of zero for each star in the pre-selection catalogue of stars, (3) selecting a neighborhood omega i of the i star, (4) detecting omega i, when j star exists in omega i and stellar magnitude Mj of the j star is lower than stellar magnitude Mi of the star i, then star i score counter Count i +1, (5), repeating the step (3) and step (4) until all stars in the pre-selection catalogue of stars pass through the same treatment, (6) traversing the pre-selection catalogue of stars, eliminating all stars with score counter larger than zero in the pre-selection catalogue of stars, and forming a navigational catalogue of stars with the rest stars. The method for eliminating dense stellar field in a catalogue of stars resolves the problem that two close stars are both selected as navigational stars, is favorable for increasing the uniformity of navigational stars distributed in the whole celestial sphere, and favorable for increasing star identification probability of star sensor.

Description

technical field [0001] The invention belongs to the technical field of star recognition and is suitable for constructing a star sensor navigation catalog. Background technique [0002] The stellar sensor is a widely used aerospace product at present. It is an optical attitude sensor with stars as the observation object. It is mainly used for attitude measurement tasks when spacecraft such as satellites and spacecraft fly in orbit. [0003] At present, the star sensor in the usual sense belongs to the star sensor in the form of a star plotter. It first needs to capture the stars in a certain area, then compare them with the stars in the internal memory catalog, use star recognition technology to confirm the "identity" of the observed stars, and finally complete the attitude measurement task. [0004] The stars recorded in the memory star catalog are called navigation stars, and the memory star catalog is also called navigation star catalog or mission star catalog. The navig...

AI Technical Summary

Problems solved by technology

[0008] The "orthogonal grid method" has the advantage of being simple, but its main disadvantages are: 1. It is not conducive to solving the problem of uniformity of navigation stars, and there is a significant difference between the density of navigation stars near the polar region and the density of navigation stars near the equator

Second, the situation that two very close stars are selected as navigation stars cannot be completely avoided

The main shortcomings of the "magnitude weighting method" are: 1. If there are other stars near a certain star, neither of these two stars can be used as a navigation star. Probability of star identification by star sensor

Second, when there are many dim stars to be detected by the star sensor, the radii of the circles involved by most of the stars are different. Therefore, in the selected navigation star catalog, there may still be dense stars in some areas, while stars in some areas may be dense. relatively rare problem

Usually the ordering of stars in different astronomical star catalogs is different, so if you use the "magnitude weighting method" to process different astronomical star catalogs, you will get completely different navigation star catalogs; or use different star selection orders to process the same astronomical star catalog , and different navigation star catalogs may be obtained, obviously, the result of such processing is not reasonable enough

Images