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Method of dividing navigational star table

A navigation star and cube technology, applied in the aerospace field, can solve the problems of low retrieval efficiency, no overlap, uniformity, etc., and achieve the effect of fast retrieval and high retrieval efficiency

Inactive Publication Date: 2006-07-26
BEIHANG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

The problem with the declination zone method is that the distribution of each sub-block is extremely uneven, and the retrieval efficiency is low
The existing navigation star catalog division method cannot be uniform and non-overlapping at the same time, and the retrieval efficiency is relatively low

Method used

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  • Method of dividing navigational star table

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Embodiment Construction

[0025] The present invention will be described in further detail below. Since the right ascension and declination coordinates are not uniform in space, the division of the celestial sphere in such a coordinate system cannot be uniform either. Considering this situation, the present invention adopts a form different from the existing method to re-divide the sky area under the Cartesian coordinate system, and the steps are as follows:

[0026] (1) Use the inscribed cube of the celestial sphere to evenly divide the celestial sphere into six areas, such as image 3 (a). The line connecting the center of the celestial sphere and the four vertices on each side of the cube forms a cone, which intersects with the sphere and divides it into six pieces.

[0027] (2) For each of the six spherical surfaces, divide it into N×N small blocks evenly in the horizontal and vertical directions. In this way, the entire celestial sphere is divided into 6×N×N sub-blocks. Each sub-block contains ...

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Abstract

The improved method for NSTR catalogue division method comprises: dividing equally the celestial sphere into six areas with its inscribed cube then for Ní‡N sub-blocks for every area; calculating directional vector opposite to the central axis and boundary point of every sub-block to scan NSTR catalogue and ascribe every NSTR into opposite sub-block; building the partition table to store the opposite stored sub-block SN. This invention realizes the homogeneous division in rectangular coordinates system with high search efficiency.

Description

technical field [0001] The invention belongs to aerospace technology, and relates to an improvement on a method for dividing a navigation star table. Background technique [0002] The star sensor is a high-precision and high-reliability attitude measurement component widely used in today's aerospace vehicles. Its working principle is: CCD (or CMOS) image sensor captures the star 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, and find the corresponding matching of the observed star in the navigation star table by the star map recognition algorithm, and finally use these matching star pairs to calculate the three-axis attitude of the star sensor. For the needs of star map recognition by star sensor, it is necessary to select stars with brightness within a certain range from the standard star table, and use these stars to form a small scale star table suitabl...

Claims

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Application Information

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IPC IPC(8): G09B27/04
Inventor 张广军魏新国江洁
Owner BEIHANG UNIV
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