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Star sensor on-orbit calibration method based on star angular distance subtraction

A technology of star sensor and calibration method, which is applied in the field of astronomical navigation and can solve the problems of time-consuming

Pending Publication Date: 2021-01-22
CHANGCHUN UNIV OF TECH
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Problems solved by technology

Aiming at the deficiencies of traditional methods, the present invention provides an on-orbit calibration method for star sensors based on star angular distance subtraction, which has a good application effect in star sensor calibration, and is especially suitable for star sensors with limited computing resources. Aiming at the time-consuming problem of the star-angle distance subtraction method, an improved star-angle distance subtraction model is proposed. Compared with the traditional star-angle distance calibration method, the improved ADS (angular distance subtraction) algorithm u 0 and v 0 Compared with the AD (angular distance) method, the accuracy is increased by 64.0% and 21.7%, which effectively improves the calibration accuracy of the principal point

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  • Star sensor on-orbit calibration method based on star angular distance subtraction
  • Star sensor on-orbit calibration method based on star angular distance subtraction
  • Star sensor on-orbit calibration method based on star angular distance subtraction

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Embodiment Construction

[0078] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0079] 1. Establish star distance subtraction model:

[0080] At present, the star sensor calibration mostly uses the angular distance as the calibration reference, and the focal length of the star sensor is f , w and v are the direction vectors of the star in the star sensor coordinate system and the celestial coordinate system respectively, and the star i The center coordinates of the projected point in the star sensor imaging plane coordinate system are ( x i ，y i ),but

[0081] (1)

[0082] (2)

[0083] in,( x 0 ，y 0 ) principal point coordinates, α i and δ i Respectively represent the first i right ascension and declination of the star; assuming that there are i , j Two stars, according to the invariant principle of star angular distance orthogonal transformation, without considering...

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Abstract

The invention relates to a star sensor on-orbit calibration method based on star angular distance subtraction, and belongs to the field of astronomical navigation. The research method comprises the following steps: establishing a pinhole imaging camera model based on a physical process of imaging a scene object to an imaging plane; establishing a star sensor angular distance model; conducting starsensor subtraction; performing observability analysis; improving a star angular distance method; and carrying out simulation experiment. According to the invention, through the improved ADS (adaptivedistance subtraction) algorithm, the precision of u0 and the precision of v0 are respectively improved by 64.0% and 21.7% compared with the traditional AD (angular distance) algorithm, and the main point calibration precision is effectively improved.

Description

technical field [0001] The present invention relates to the field of celestial navigation, in particular to a calibration method, in particular to an on-orbit calibration method of a star sensor based on star angular distance subtraction. Background technique [0002] The star sensor is a navigation system that obtains the attitude information of the carrier through the observation of the stars. It is the most accurate optical attitude sensor available. Due to its high navigation accuracy, strong autonomy, and no cumulative error, it is favored by the aerospace industry. As the "eyes" of the spacecraft, the accuracy of the star sensor directly determines the performance of the spacecraft. However, a star sensor is an optical device whose accuracy depends on the imaging quality and the accuracy of optical parameters including focal length, principal point, and distortion. Therefore, calibration is one of the key technologies of star sensors. [0003] The star sensor needs...

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Application Information

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IPC IPC(8): G01C25/00G01C21/20
CPCG01C25/00G01C21/20
Inventor 吴量韩超许倩张凯旋
Owner CHANGCHUN UNIV OF TECH
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