Star catalogue partitioning and feature library building method and device applied to star sensor

A technology of star sensor and feature library, which is applied in the field of astronomical navigation, can solve the problems of low degree of division, uneven division of star catalogs, affecting the speed of star map recognition and recognition, and achieve the effect of improving uniformity and high degree of division

Inactive Publication Date: 2020-04-03
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] When the star sensor images the starry sky, due to the limitation of the field of view, it usually can only image a certain sky area, and the triangle algorithm needs to search the entire star catalog during the recognition process, which seriously affects the star map recognition recognition speed
In order to solve this problem, the existing method is to divide the entire sky area into several sub-regions, but there are problems in the existing technology that the partitioning of the star catalog is uneven and the degree of partitioning is low

Method used

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  • Star catalogue partitioning and feature library building method and device applied to star sensor
  • Star catalogue partitioning and feature library building method and device applied to star sensor
  • Star catalogue partitioning and feature library building method and device applied to star sensor

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Embodiment 1

[0063] like figure 1 shown, the center of the celestial sphere o c The line connecting the three vertices in each face of the icosahedron inscribed in the celestial sphere forms a cone. The cone intersects with the spherical surface and divides its surface into 20 areas, numbered S respectively. 1 ~S 20 . for S 1 ~S 20 Each area in , and then divide it into equal parts (N+1) 2 sub-regions, and number each sub-region, so the entire celestial sphere can be divided into 20×(N+1) 2 In the process of practical application, it is necessary to select an appropriate value according to the size of the field of view of the star sensor. When N=0, it means that S is no longer 1 ~S 20 Divide.

[0064] According to the above-mentioned method of partitioning the star table, the entire star table is traversed, and each navigation star is classified into the corresponding sub-region, and finally the partition of the star table is completed. In the star table after the division, the i...

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Abstract

The invention discloses a star catalogue partitioning and feature library building method applied to a star sensor, which comprises the following steps of: uniformly partitioning a star catalogue by using an inscribed regular icosahedron method of a celestial sphere to form a partitioned star catalogue; determining a celestial sphere subarea corresponding to a subarea where a part of star points in the star sensor view field are located, retrieving a navigation star in the celestial sphere subarea, and extracting position information of the navigation star; and constructing a navigation feature library by taking the information of the navigation satellites in the star catalogue and the position relationship among the navigation satellites as feature values. The invention further disclosesa star catalogue partitioning and feature library building device applied to the star sensor. The star catalogue partitioning and feature library building method and device applied to the star sensorhave the advantage of uniform partitioning.

Description

technical field [0001] The invention relates to the technical field of astronomical navigation, in particular to a method and device for star catalog partitioning and feature database building applied to a star sensor. Background technique [0002] The star sensor is a high-precision space attitude measurement device with the equatorial inertial frame as the reference frame and the stars as the navigation information source. The star map recognition algorithm is used to find the observation star in the navigation star library, and the orientation vector of the observation star is used to determine the attitude information of the spacecraft. [0003] When the star sensor images the starry sky, due to the limitation of the size of the field of view, it can usually only image a certain area of ​​the sky, and the triangle algorithm needs to search the entire star table in the process of identification, which seriously affects the star map identification. recognition speed. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 穆治亚王军何昕魏仲慧张磊何家维吕游
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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