Navigational star screening method for star sensors

A technology of star sensor and navigation star, applied in the field of screening navigation stars, can solve the problems of less consideration of the position of the stars, the evenness of the distribution of the navigation stars needs to be improved, the distribution of the navigation stars is not uniform enough, etc., and the effect of uniform distribution can be achieved.

Inactive Publication Date: 2012-12-26
CHANGZHOU INST OF TECH +1
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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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  • Navigational star screening method for star sensors
  • Navigational star screening method for star sensors
  • Navigational star screening method for star sensors

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Embodiment 1

[0047] 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.

[0048] 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

[0067] Realize on the basis of embodiment 1 the method for the screening navigation star of star sensor, its specific implementation process is as follows:

[0068] 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 is 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.

[0069] 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

[0097] On the basis of Example 1 and Example 2, the content of the present invention is further illustrated through the implementation of two segmentation scales (ie, different values ​​of q and p) and comparison with the prior art.

[0098] The following embodiments use 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 ...

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Abstract

The invention relates to a navigational star screening method for star sensors, which includes the following steps: (1) according to the limiting magnitude of a star sensor, the stars of the original star catalogue of the whole celestial sphere are filtered and a star number threshold Nth is determined; (2) the number of the remaining stars of the star sensor in the field of view of the current sky area is set as N; if N is less than or equal to Nth, then all the remaining stars are chosen as navigational stars, and step 3 is executed; and if N is greater than Nth, then the navigational stars in the field of view of the current sky area are segmented and screened by a multi-scale image plane; (3) after the navigational stars in the field of view of the current sky area are screened, the star sensor turns to the next direction to repeat navigational star screening in step 2 until the whole celestial sphere is traversed. The multi-scale image plane segmentation and screening method adopted in the invention can be adapted to the variation in the star numbers of different sky areas to delete the redundant stars of sky areas with high star distribution density and keep all the stars of low-density sky areas, and moreover, the distribution of the screened navigational stars is even.

Description

technical field [0001] The invention belongs to the technical field of celestial navigation, and relates to a method for screening navigation stars for a star sensor. 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 to improve the anti-fa...

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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