Star sensor navigational star screening method by orthogonal list

A technology of star sensor and cross-link table, which is applied in the field of astronomical navigation, can solve the problems of seldom considering the position of stars, the uniformity of the distribution of navigation stars, and the uneven distribution of navigation stars, etc., so as to quickly search and judge the star image area, navigation Uniform distribution of stars and fast speed effect

Inactive Publication Date: 2013-01-09
CHANGZHOU INST OF TECH +1
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  • Claims
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Problems solved by technology

In 2000, Li Lihong and others proposed a magnitude weighting method, which assigns different weights to each star according to the magnitude. Stars with low magnitudes have high weights, and stars with high magnitudes have low weights. According to the weights, guide stars are selected. The algorithm is better than the orthogonal grid method, but the algorithm less considers the position of stars, and the uniformity of the distribution of navigation stars needs to be improved
The regression selection algorithm proposed by Zheng S

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  • Star sensor navigational star screening method by orthogonal list
  • Star sensor navigational star screening method by orthogonal list
  • Star sensor navigational star screening method by orthogonal list

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Embodiment 1

[0069] There are two characteristics of the star-image high-density area, one is that there are many star images in the same area, and the other is that the distance between the star images is short. According to these two characteristics, the present invention designs a method for screening navigation stars for star sensors.

[0070] First, according to the first feature, the image plane is divided into multiple rectangular areas of equal area along the row and column directions of the focal plane of the image plane detector to form an orthogonal grid. To simplify the description, each rectangular area is called a cell (that is, each grid in the orthogonal grid is a cell), and the equally divided interval in the row and column directions is called a scale. Select a certain scale to segment the image plane (also known as the image plane), and in actual operation, set the number of rows p and the number of columns q to realize the division of the image plane; if the high-densit...

Embodiment 2

[0103] Realize on the basis of embodiment 1 the method for the screening navigation star of star sensor, its specific implementation process is as follows:

[0104] The first step is to filter the original star catalog. Delete dark stars according to the limit star magnitude, and delete variable stars and double stars at the same time. For the convenience of subsequent processing, the remaining star data are arranged in ascending order according to declination, and the star number threshold N is determined according to the star map recognition algorithm. th , that is, select the corresponding star map recognition algorithm according to actual needs to determine the star number threshold N th , you can also set it yourself according to your needs.

[0105] In the second step, the optical axis of the star sensor points to the coordinate on the whole celestial sphere (α i ,δ i ) position, α i or delta i Change 1° every time, traverse the whole celestial sphere. Extract each...

Embodiment 3

[0141] On the basis of Example 1 and Example 2, the implementation effect of the present invention will be further described.

[0142] This embodiment uses the SAO star catalog as the original star catalog; SAO star catalog (The Smithsonian Astrophysical Observatory Star Catalog / Smithsonian Astrophysical Observatory Star Catalog) is an astrometric star catalog, published by the Smithsonian Astrophysical Observatory in 1966 , containing a total of 258,997 stars. This catalog is compiled from some previous catalogs, but only includes stars above magnitude 9.0 and whose proper motions have been accurately measured. The star names in the SAO star catalog start with the letter SAO followed by a numerical serial number. The stars are divided into divisions by declination, and every 10 degrees is a division, which is divided into 18 divisions. The stars in each division are sorted according to the position of right ascension.

[0143] Select the SAO star catalog as the original star...

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Abstract

The invention relates to a star sensor navigational star screening method by an orthogonal list, comprising the following steps of: 1, carrying out star filtering treatment on the original star catalogue of the whole celestial sphere according to the limit star of a star sensor and the like, and confirming the threshold value Nth of star number; 2, setting the number of the residual stars of the star sensor within a current sky area view field as N, if N is less than or equal to Nth, selecting the residual stars as navigational stars, and carrying out step 3, and if N is larger than Nth, cutting and screening the navigational stars within the current sky area view field by a multi-scale image surface; and 3, after screening of the navigational stars of the current sky area view field is completed, transferring the star sensor to the next position, and repeating the step (2) to screen the navigational stars till going through all the celestial sphere. According to the multi-scale image plane cutting and screening method disclosed by the invention, the redundant stars within a star distribution high intensity sky area can be eliminated along with the star number change of different sky areas, all the stars within a low-intensity sky region can be remained, and the screened navigational stars are evenly distributed.

Description

technical field [0001] The invention belongs to the technical field of celestial navigation, and relates to a method for screening navigation stars by a star sensor using a cross-link list. Background technique [0002] The star sensor recognizes the star map, compares the characteristics of the observation star group and the navigation star group, identifies the observation star, determines their coordinates in the body coordinate system and the inertial coordinate system, and then measures the satellite attitude. It is a modern aerospace field. The most accurate satellite attitude measurement instrument. Star map recognition is the core technology of the star sensor. Establishing a navigation star library is an important prerequisite for star map recognition. Reasonable selection of navigation stars can reduce the similarity of navigation star group features, improve star map recognition speed and success rate, and enhance star map recognition. It is of great significance...

Claims

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Application Information

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IPC IPC(8): G01C21/02
Inventor 吴峰沈为民朱锡芳
Owner CHANGZHOU INST OF TECH
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