A star pattern recognition method, device and system based on triangle matching

A star map recognition and triangle technology, which is applied in the field of aerospace navigation, can solve the problems of high probability of redundant matching, increased calculation amount, and limited number of verification stars.

Active Publication Date: 2020-04-10
BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE +1
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Problems solved by technology

[0008] 3) When the error threshold range is large, the probability of redundant matching using 3-point triangle matching is high
[0009] 4) If verification stars are added outside the triangle, the amount of calculation will increase significantly, limiting the number of verification stars

Method used

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  • A star pattern recognition method, device and system based on triangle matching
  • A star pattern recognition method, device and system based on triangle matching
  • A star pattern recognition method, device and system based on triangle matching

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Embodiment

[0152] In response to the demand for autonomous attitude determination of spacecraft, a star map recognition device based on triangle matching was developed. This device completed star map shooting and star map recognition, and finally gave the star map recognition result, that is, the star map was established. There is a one-to-one correspondence between the points and the asterisks in the star database, so that the right ascension and declination values ​​of each star point can be obtained for the subsequent attitude calculation system to perform the attitude determination.

[0153] The camera field of view of the device is 15°×15°, the focal length is 18.8mm, the detector scale is 496×496, the pixel size is 10μm, the detectable noise ratio for 6th magnitude stars is 8, the lens distortion is less than 1%, and ε is 1.5. %. The specific process of using this device for star map recognition is as follows:

[0154] (1) In the outskirts of Yanqing, Beijing, a star map was taken on t...

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Abstract

The invention relates to a star map recognition method, a star map recognition apparatus and a star map recognition system based on triangle matching. According to the present invention, part of starpoints are selected from bright stars, and are recognized, and re-selection is performed if the recognition fails, such that the interference caused by pseudo stars in the star map can be eliminated;the matching is performed with the multiple star points, such that the redundant matching probability can be substantially reduced in the case of the high error margin; the traditional absolute errorthreshold is changed into the relative error threshold, such that the small angular distance is corresponding to the small error margin so as to increase the calculation speed; and the primary recognition on the star points is completed by comparing the star number, and the primary recognition result is verified by comparing the theoretical angular distance value calculated with right ascension and declination to the actual measurement value, such that the number of the searching of the star number according to the angular distance and the number of the star number comparing are reduced, and the total recognition speed is improved.

Description

Technical field [0001] The invention belongs to the technical field of aerospace navigation and relates to the improvement of a recognition algorithm based on a triangular feature star map. Background technique [0002] The star sensor (Xingmin) is an instrument that uses the star map to determine the attitude of the platform. Attitude measurement is a prerequisite for space flight control, and it is of great significance to ensure the high-performance flight, high-precision observation of spacecraft and the smooth completion of various space missions. [0003] As early as 1997, Padgett C et al. proposed the original triangle star pattern recognition method, which uses the three angular distances of the triangle to match. The observation triangle is composed of any three stars in the field of view. According to the three corners of the observation triangle The distance is matched with the three angular distances of the navigation triangle in the navigation star library. If the err...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/02G01C21/20
Inventor 李建华张力牛振红李志峰束逸刘佳琪刘鑫刘洪艳高路杜润乐薛莲薛峰赵茜蔡雯琳
Owner BEIJING AEROSPACE INST OF THE LONG MARCH VEHICLE
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